<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `liballoc/btree/set.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>set.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../alloc/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 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id="793"> 793</span> <span id="794"> 794</span> <span id="795"> 795</span> <span id="796"> 796</span> <span id="797"> 797</span> <span id="798"> 798</span> <span id="799"> 799</span> <span id="800"> 800</span> <span id="801"> 801</span> <span id="802"> 802</span> <span id="803"> 803</span> <span id="804"> 804</span> <span id="805"> 805</span> <span id="806"> 806</span> <span id="807"> 807</span> <span id="808"> 808</span> <span id="809"> 809</span> <span id="810"> 810</span> <span id="811"> 811</span> <span id="812"> 812</span> <span id="813"> 813</span> <span id="814"> 814</span> <span id="815"> 815</span> <span id="816"> 816</span> <span id="817"> 817</span> <span id="818"> 818</span> <span id="819"> 819</span> <span id="820"> 820</span> <span id="821"> 821</span> <span id="822"> 822</span> <span id="823"> 823</span> <span id="824"> 824</span> <span id="825"> 825</span> <span id="826"> 826</span> <span id="827"> 827</span> <span id="828"> 828</span> <span id="829"> 829</span> <span id="830"> 830</span> <span id="831"> 831</span> <span id="832"> 832</span> <span id="833"> 833</span> <span id="834"> 834</span> <span id="835"> 835</span> <span id="836"> 836</span> <span id="837"> 837</span> <span id="838"> 838</span> <span id="839"> 839</span> <span id="840"> 840</span> <span id="841"> 841</span> <span id="842"> 842</span> <span id="843"> 843</span> <span id="844"> 844</span> <span id="845"> 845</span> <span id="846"> 846</span> <span id="847"> 847</span> <span id="848"> 848</span> <span id="849"> 849</span> <span id="850"> 850</span> <span id="851"> 851</span> <span id="852"> 852</span> <span id="853"> 853</span> <span id="854"> 854</span> <span id="855"> 855</span> <span id="856"> 856</span> <span id="857"> 857</span> <span id="858"> 858</span> <span id="859"> 859</span> <span id="860"> 860</span> <span id="861"> 861</span> <span id="862"> 862</span> <span id="863"> 863</span> <span id="864"> 864</span> <span id="865"> 865</span> <span id="866"> 866</span> <span id="867"> 867</span> <span id="868"> 868</span> <span id="869"> 869</span> <span id="870"> 870</span> <span id="871"> 871</span> <span id="872"> 872</span> <span id="873"> 873</span> <span id="874"> 874</span> <span id="875"> 875</span> <span id="876"> 876</span> <span id="877"> 877</span> <span id="878"> 878</span> <span id="879"> 879</span> <span id="880"> 880</span> <span id="881"> 881</span> <span id="882"> 882</span> <span id="883"> 883</span> <span id="884"> 884</span> <span id="885"> 885</span> <span id="886"> 886</span> <span id="887"> 887</span> <span id="888"> 888</span> <span id="889"> 889</span> <span id="890"> 890</span> <span id="891"> 891</span> <span id="892"> 892</span> <span id="893"> 893</span> <span id="894"> 894</span> <span id="895"> 895</span> <span id="896"> 896</span> <span id="897"> 897</span> <span id="898"> 898</span> <span id="899"> 899</span> <span id="900"> 900</span> <span id="901"> 901</span> <span id="902"> 902</span> <span id="903"> 903</span> <span id="904"> 904</span> <span id="905"> 905</span> <span id="906"> 906</span> <span id="907"> 907</span> <span id="908"> 908</span> <span id="909"> 909</span> <span id="910"> 910</span> <span id="911"> 911</span> <span id="912"> 912</span> <span id="913"> 913</span> <span id="914"> 914</span> <span id="915"> 915</span> <span id="916"> 916</span> <span id="917"> 917</span> <span id="918"> 918</span> <span id="919"> 919</span> <span id="920"> 920</span> <span id="921"> 921</span> <span id="922"> 922</span> <span id="923"> 923</span> <span id="924"> 924</span> <span id="925"> 925</span> <span id="926"> 926</span> <span id="927"> 927</span> <span id="928"> 928</span> <span id="929"> 929</span> <span id="930"> 930</span> <span id="931"> 931</span> <span id="932"> 932</span> <span id="933"> 933</span> <span id="934"> 934</span> <span id="935"> 935</span> <span id="936"> 936</span> <span id="937"> 937</span> <span id="938"> 938</span> <span id="939"> 939</span> <span id="940"> 940</span> <span id="941"> 941</span> <span id="942"> 942</span> <span id="943"> 943</span> <span id="944"> 944</span> <span id="945"> 945</span> <span id="946"> 946</span> <span id="947"> 947</span> <span id="948"> 948</span> <span id="949"> 949</span> <span id="950"> 950</span> <span id="951"> 951</span> <span id="952"> 952</span> <span id="953"> 953</span> <span id="954"> 954</span> <span id="955"> 955</span> <span id="956"> 956</span> <span id="957"> 957</span> <span id="958"> 958</span> <span id="959"> 959</span> <span id="960"> 960</span> <span id="961"> 961</span> <span id="962"> 962</span> <span id="963"> 963</span> <span id="964"> 964</span> <span id="965"> 965</span> <span id="966"> 966</span> <span id="967"> 967</span> <span id="968"> 968</span> <span id="969"> 969</span> <span id="970"> 970</span> <span id="971"> 971</span> <span id="972"> 972</span> <span id="973"> 973</span> <span id="974"> 974</span> <span id="975"> 975</span> <span id="976"> 976</span> <span id="977"> 977</span> <span id="978"> 978</span> <span id="979"> 979</span> <span id="980"> 980</span> <span id="981"> 981</span> <span id="982"> 982</span> <span id="983"> 983</span> <span id="984"> 984</span> <span id="985"> 985</span> <span id="986"> 986</span> <span id="987"> 987</span> <span id="988"> 988</span> <span id="989"> 989</span> <span id="990"> 990</span> <span id="991"> 991</span> <span id="992"> 992</span> <span id="993"> 993</span> <span id="994"> 994</span> <span id="995"> 995</span> <span id="996"> 996</span> <span id="997"> 997</span> <span id="998"> 998</span> <span id="999"> 999</span> <span id="1000">1000</span> <span id="1001">1001</span> <span id="1002">1002</span> <span id="1003">1003</span> <span id="1004">1004</span> <span id="1005">1005</span> <span id="1006">1006</span> <span id="1007">1007</span> <span id="1008">1008</span> <span id="1009">1009</span> <span id="1010">1010</span> <span id="1011">1011</span> <span id="1012">1012</span> <span id="1013">1013</span> <span id="1014">1014</span> <span id="1015">1015</span> <span id="1016">1016</span> <span id="1017">1017</span> <span id="1018">1018</span> <span id="1019">1019</span> <span id="1020">1020</span> <span id="1021">1021</span> <span id="1022">1022</span> <span id="1023">1023</span> <span id="1024">1024</span> <span id="1025">1025</span> <span id="1026">1026</span> <span id="1027">1027</span> <span id="1028">1028</span> <span id="1029">1029</span> <span id="1030">1030</span> <span id="1031">1031</span> <span id="1032">1032</span> <span id="1033">1033</span> <span id="1034">1034</span> <span id="1035">1035</span> <span id="1036">1036</span> <span id="1037">1037</span> <span id="1038">1038</span> <span id="1039">1039</span> <span id="1040">1040</span> <span id="1041">1041</span> <span id="1042">1042</span> <span id="1043">1043</span> <span id="1044">1044</span> <span id="1045">1045</span> <span id="1046">1046</span> <span id="1047">1047</span> <span id="1048">1048</span> <span id="1049">1049</span> <span id="1050">1050</span> <span id="1051">1051</span> <span id="1052">1052</span> <span id="1053">1053</span> <span id="1054">1054</span> <span id="1055">1055</span> <span id="1056">1056</span> <span id="1057">1057</span> <span id="1058">1058</span> <span id="1059">1059</span> <span id="1060">1060</span> <span id="1061">1061</span> <span id="1062">1062</span> <span id="1063">1063</span> <span id="1064">1064</span> <span id="1065">1065</span> <span id="1066">1066</span> <span id="1067">1067</span> <span id="1068">1068</span> <span id="1069">1069</span> <span id="1070">1070</span> <span id="1071">1071</span> <span id="1072">1072</span> <span id="1073">1073</span> <span id="1074">1074</span> <span id="1075">1075</span> <span id="1076">1076</span> <span id="1077">1077</span> <span id="1078">1078</span> <span id="1079">1079</span> <span id="1080">1080</span> <span id="1081">1081</span> <span id="1082">1082</span> <span id="1083">1083</span> <span id="1084">1084</span> <span id="1085">1085</span> <span id="1086">1086</span> <span id="1087">1087</span> <span id="1088">1088</span> <span id="1089">1089</span> <span id="1090">1090</span> <span id="1091">1091</span> <span id="1092">1092</span> <span id="1093">1093</span> <span id="1094">1094</span> <span id="1095">1095</span> <span id="1096">1096</span> <span id="1097">1097</span> <span id="1098">1098</span> <span id="1099">1099</span> <span id="1100">1100</span> <span id="1101">1101</span> <span id="1102">1102</span> <span id="1103">1103</span> <span id="1104">1104</span> <span id="1105">1105</span> <span id="1106">1106</span> <span id="1107">1107</span> <span id="1108">1108</span> <span id="1109">1109</span> <span id="1110">1110</span> <span id="1111">1111</span> <span id="1112">1112</span> <span id="1113">1113</span> <span id="1114">1114</span> <span id="1115">1115</span> <span id="1116">1116</span> <span id="1117">1117</span> <span id="1118">1118</span> <span id="1119">1119</span> <span id="1120">1120</span> <span id="1121">1121</span> <span id="1122">1122</span> <span id="1123">1123</span> <span id="1124">1124</span> <span id="1125">1125</span> <span id="1126">1126</span> <span id="1127">1127</span> <span id="1128">1128</span> <span id="1129">1129</span> <span id="1130">1130</span> <span id="1131">1131</span> <span id="1132">1132</span> <span id="1133">1133</span> <span id="1134">1134</span> <span id="1135">1135</span> <span id="1136">1136</span> <span id="1137">1137</span> <span id="1138">1138</span> <span id="1139">1139</span> <span id="1140">1140</span> <span id="1141">1141</span> <span id="1142">1142</span> <span id="1143">1143</span> <span id="1144">1144</span> <span id="1145">1145</span> <span id="1146">1146</span> <span id="1147">1147</span> <span id="1148">1148</span> <span id="1149">1149</span> <span id="1150">1150</span> <span id="1151">1151</span> <span id="1152">1152</span> <span id="1153">1153</span> </pre><pre class="rust "> <span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="comment">// This is pretty much entirely stolen from TreeSet, since BTreeMap has an identical interface</span> <span class="comment">// to TreeMap</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>::{<span class="self">self</span>, <span class="ident">Less</span>, <span class="ident">Greater</span>, <span class="ident">Equal</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>::{<span class="ident">min</span>, <span class="ident">max</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>::<span class="ident">Debug</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::{<span class="ident">Peekable</span>, <span class="ident">FromIterator</span>, <span class="ident">FusedIterator</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::{<span class="ident">BitOr</span>, <span class="ident">BitAnd</span>, <span class="ident">BitXor</span>, <span class="ident">Sub</span>, <span class="ident">RangeBounds</span>}; <span class="kw">use</span> <span class="ident">borrow</span>::<span class="ident">Borrow</span>; <span class="kw">use</span> <span class="ident">btree_map</span>::{<span class="ident">BTreeMap</span>, <span class="ident">Keys</span>}; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Recover</span>; <span class="comment">// FIXME(conventions): implement bounded iterators</span> <span class="doccomment">/// A set based on a B-Tree.</span> <span class="doccomment">///</span> <span class="doccomment">/// See [`BTreeMap`]'s documentation for a detailed discussion of this collection's performance</span> <span class="doccomment">/// benefits and drawbacks.</span> <span class="doccomment">///</span> <span class="doccomment">/// It is a logic error for an item to be modified in such a way that the item's ordering relative</span> <span class="doccomment">/// to any other item, as determined by the [`Ord`] trait, changes while it is in the set. This is</span> <span class="doccomment">/// normally only possible through [`Cell`], [`RefCell`], global state, I/O, or unsafe code.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.html</span> <span class="doccomment">/// [`Ord`]: ../../std/cmp/trait.Ord.html</span> <span class="doccomment">/// [`Cell`]: ../../std/cell/struct.Cell.html</span> <span class="doccomment">/// [`RefCell`]: ../../std/cell/struct.RefCell.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// // Type inference lets us omit an explicit type signature (which</span> <span class="doccomment">/// // would be `BTreeSet<&str>` in this example).</span> <span class="doccomment">/// let mut books = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// // Add some books.</span> <span class="doccomment">/// books.insert("A Dance With Dragons");</span> <span class="doccomment">/// books.insert("To Kill a Mockingbird");</span> <span class="doccomment">/// books.insert("The Odyssey");</span> <span class="doccomment">/// books.insert("The Great Gatsby");</span> <span class="doccomment">///</span> <span class="doccomment">/// // Check for a specific one.</span> <span class="doccomment">/// if !books.contains("The Winds of Winter") {</span> <span class="doccomment">/// println!("We have {} books, but The Winds of Winter ain't one.",</span> <span class="doccomment">/// books.len());</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // Remove a book.</span> <span class="doccomment">/// books.remove("The Odyssey");</span> <span class="doccomment">///</span> <span class="doccomment">/// // Iterate over everything.</span> <span class="doccomment">/// for book in &books {</span> <span class="doccomment">/// println!("{}", book);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Ord</span>, <span class="ident">PartialOrd</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span>, } <span class="doccomment">/// An iterator over the items of a `BTreeSet`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`iter`] method on [`BTreeSet`].</span> <span class="doccomment">/// See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`iter`]: struct.BTreeSet.html#method.iter</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">iter</span>: <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, ()<span class="op">></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Iter"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>()) .<span class="ident">finish</span>() } } <span class="doccomment">/// An owning iterator over the items of a `BTreeSet`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`into_iter`] method on [`BTreeSet`][`BTreeSet`]</span> <span class="doccomment">/// (provided by the `IntoIterator` trait). See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`into_iter`]: struct.BTreeSet.html#method.into_iter</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">iter</span>: ::<span class="ident">btree_map</span>::<span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span>, } <span class="doccomment">/// An iterator over a sub-range of items in a `BTreeSet`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`range`] method on [`BTreeSet`].</span> <span class="doccomment">/// See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`range`]: struct.BTreeSet.html#method.range</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">iter</span>: ::<span class="ident">btree_map</span>::<span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, ()<span class="op">></span>, } <span class="doccomment">/// A lazy iterator producing elements in the difference of `BTreeSet`s.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`difference`] method on [`BTreeSet`].</span> <span class="doccomment">/// See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`difference`]: struct.BTreeSet.html#method.difference</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">a</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, <span class="ident">b</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Difference"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">a</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// A lazy iterator producing elements in the symmetric difference of `BTreeSet`s.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`symmetric_difference`] method on</span> <span class="doccomment">/// [`BTreeSet`]. See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`symmetric_difference`]: struct.BTreeSet.html#method.symmetric_difference</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">a</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, <span class="ident">b</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"SymmetricDifference"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">a</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// A lazy iterator producing elements in the intersection of `BTreeSet`s.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`intersection`] method on [`BTreeSet`].</span> <span class="doccomment">/// See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`intersection`]: struct.BTreeSet.html#method.intersection</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">a</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, <span class="ident">b</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Intersection"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">a</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// A lazy iterator producing elements in the union of `BTreeSet`s.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`union`] method on [`BTreeSet`].</span> <span class="doccomment">/// See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeSet`]: struct.BTreeSet.html</span> <span class="doccomment">/// [`union`]: struct.BTreeSet.html#method.union</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">a</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, <span class="ident">b</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Union"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">a</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b</span>) .<span class="ident">finish</span>() } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Makes a new `BTreeSet` with a reasonable choice of B.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// # #![allow(unused_mut)]</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set: BTreeSet<i32> = BTreeSet::new();</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">BTreeSet</span> { <span class="ident">map</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>() } } <span class="doccomment">/// Constructs a double-ended iterator over a sub-range of elements in the set.</span> <span class="doccomment">/// The simplest way is to use the range syntax `min..max`, thus `range(min..max)` will</span> <span class="doccomment">/// yield elements from min (inclusive) to max (exclusive).</span> <span class="doccomment">/// The range may also be entered as `(Bound<T>, Bound<T>)`, so for example</span> <span class="doccomment">/// `range((Excluded(4), Included(10)))` will yield a left-exclusive, right-inclusive</span> <span class="doccomment">/// range from 4 to 10.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">/// use std::ops::Bound::Included;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">/// set.insert(3);</span> <span class="doccomment">/// set.insert(5);</span> <span class="doccomment">/// set.insert(8);</span> <span class="doccomment">/// for &elem in set.range((Included(&4), Included(&8))) {</span> <span class="doccomment">/// println!("{}", elem);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(Some(&5), set.range(4..).next());</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">range</span><span class="op"><</span><span class="ident">K</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">range</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Range</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">K</span><span class="op">></span>, <span class="ident">R</span>: <span class="ident">RangeBounds</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> { <span class="ident">Range</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">range</span>(<span class="ident">range</span>) } } <span class="doccomment">/// Visits the values representing the difference,</span> <span class="doccomment">/// i.e. the values that are in `self` but not in `other`,</span> <span class="doccomment">/// in ascending order.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">/// a.insert(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">/// b.insert(2);</span> <span class="doccomment">/// b.insert(3);</span> <span class="doccomment">///</span> <span class="doccomment">/// let diff: Vec<_> = a.difference(&b).cloned().collect();</span> <span class="doccomment">/// assert_eq!(diff, [1]);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">difference</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Difference</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), <span class="ident">b</span>: <span class="ident">other</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), } } <span class="doccomment">/// Visits the values representing the symmetric difference,</span> <span class="doccomment">/// i.e. the values that are in `self` or in `other` but not in both,</span> <span class="doccomment">/// in ascending order.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">/// a.insert(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">/// b.insert(2);</span> <span class="doccomment">/// b.insert(3);</span> <span class="doccomment">///</span> <span class="doccomment">/// let sym_diff: Vec<_> = a.symmetric_difference(&b).cloned().collect();</span> <span class="doccomment">/// assert_eq!(sym_diff, [1, 3]);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">symmetric_difference</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">SymmetricDifference</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), <span class="ident">b</span>: <span class="ident">other</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), } } <span class="doccomment">/// Visits the values representing the intersection,</span> <span class="doccomment">/// i.e. the values that are both in `self` and `other`,</span> <span class="doccomment">/// in ascending order.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">/// a.insert(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">/// b.insert(2);</span> <span class="doccomment">/// b.insert(3);</span> <span class="doccomment">///</span> <span class="doccomment">/// let intersection: Vec<_> = a.intersection(&b).cloned().collect();</span> <span class="doccomment">/// assert_eq!(intersection, [2]);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">intersection</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Intersection</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), <span class="ident">b</span>: <span class="ident">other</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), } } <span class="doccomment">/// Visits the values representing the union,</span> <span class="doccomment">/// i.e. all the values in `self` or `other`, without duplicates,</span> <span class="doccomment">/// in ascending order.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">/// b.insert(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// let union: Vec<_> = a.union(&b).cloned().collect();</span> <span class="doccomment">/// assert_eq!(union, [1, 2]);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Union</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), <span class="ident">b</span>: <span class="ident">other</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>(), } } <span class="doccomment">/// Clears the set, removing all values.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = BTreeSet::new();</span> <span class="doccomment">/// v.insert(1);</span> <span class="doccomment">/// v.clear();</span> <span class="doccomment">/// assert!(v.is_empty());</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">clear</span>() } <span class="doccomment">/// Returns `true` if the set contains a value.</span> <span class="doccomment">///</span> <span class="doccomment">/// The value may be any borrowed form of the set's value type,</span> <span class="doccomment">/// but the ordering on the borrowed form *must* match the</span> <span class="doccomment">/// ordering on the value type.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// assert_eq!(set.contains(&1), true);</span> <span class="doccomment">/// assert_eq!(set.contains(&4), false);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">contains_key</span>(<span class="ident">value</span>) } <span class="doccomment">/// Returns a reference to the value in the set, if any, that is equal to the given value.</span> <span class="doccomment">///</span> <span class="doccomment">/// The value may be any borrowed form of the set's value type,</span> <span class="doccomment">/// but the ordering on the borrowed form *must* match the</span> <span class="doccomment">/// ordering on the value type.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// assert_eq!(set.get(&2), Some(&2));</span> <span class="doccomment">/// assert_eq!(set.get(&4), None);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="ident">Recover</span>::<span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>) } <span class="doccomment">/// Returns `true` if `self` has no elements in common with `other`.</span> <span class="doccomment">/// This is equivalent to checking for an empty intersection.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let a: BTreeSet<_> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a.is_disjoint(&b), true);</span> <span class="doccomment">/// b.insert(4);</span> <span class="doccomment">/// assert_eq!(a.is_disjoint(&b), true);</span> <span class="doccomment">/// b.insert(1);</span> <span class="doccomment">/// assert_eq!(a.is_disjoint(&b), false);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">intersection</span>(<span class="ident">other</span>).<span class="ident">next</span>().<span class="ident">is_none</span>() } <span class="doccomment">/// Returns `true` if the set is a subset of another,</span> <span class="doccomment">/// i.e. `other` contains at least all the values in `self`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let sup: BTreeSet<_> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(set.is_subset(&sup), true);</span> <span class="doccomment">/// set.insert(2);</span> <span class="doccomment">/// assert_eq!(set.is_subset(&sup), true);</span> <span class="doccomment">/// set.insert(4);</span> <span class="doccomment">/// assert_eq!(set.is_subset(&sup), false);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="comment">// Stolen from TreeMap</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">y</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">iter</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">next</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">next</span>(); <span class="kw">while</span> <span class="ident">a</span>.<span class="ident">is_some</span>() { <span class="kw">if</span> <span class="ident">b</span>.<span class="ident">is_none</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; } <span class="kw">let</span> <span class="ident">a1</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">b1</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">unwrap</span>(); <span class="kw">match</span> <span class="ident">b1</span>.<span class="ident">cmp</span>(<span class="ident">a1</span>) { <span class="ident">Less</span> <span class="op">=></span> (), <span class="ident">Greater</span> <span class="op">=></span> <span class="kw">return</span> <span class="bool-val">false</span>, <span class="ident">Equal</span> <span class="op">=></span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">x</span>.<span class="ident">next</span>(), } <span class="ident">b</span> <span class="op">=</span> <span class="ident">y</span>.<span class="ident">next</span>(); } <span class="bool-val">true</span> } <span class="doccomment">/// Returns `true` if the set is a superset of another,</span> <span class="doccomment">/// i.e. `self` contains at least all the values in `other`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let sub: BTreeSet<_> = [1, 2].iter().cloned().collect();</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(set.is_superset(&sub), false);</span> <span class="doccomment">///</span> <span class="doccomment">/// set.insert(0);</span> <span class="doccomment">/// set.insert(1);</span> <span class="doccomment">/// assert_eq!(set.is_superset(&sub), false);</span> <span class="doccomment">///</span> <span class="doccomment">/// set.insert(2);</span> <span class="doccomment">/// assert_eq!(set.is_superset(&sub), true);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">other</span>.<span class="ident">is_subset</span>(<span class="self">self</span>) } <span class="doccomment">/// Adds a value to the set.</span> <span class="doccomment">///</span> <span class="doccomment">/// If the set did not have this value present, `true` is returned.</span> <span class="doccomment">///</span> <span class="doccomment">/// If the set did have this value present, `false` is returned, and the</span> <span class="doccomment">/// entry is not updated. See the [module-level documentation] for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [module-level documentation]: index.html#insert-and-complex-keys</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(set.insert(2), true);</span> <span class="doccomment">/// assert_eq!(set.insert(2), false);</span> <span class="doccomment">/// assert_eq!(set.len(), 1);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">insert</span>(<span class="ident">value</span>, ()).<span class="ident">is_none</span>() } <span class="doccomment">/// Adds a value to the set, replacing the existing value, if any, that is equal to the given</span> <span class="doccomment">/// one. Returns the replaced value.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">/// set.insert(Vec::<i32>::new());</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(set.get(&[][..]).unwrap().capacity(), 0);</span> <span class="doccomment">/// set.replace(Vec::with_capacity(10));</span> <span class="doccomment">/// assert_eq!(set.get(&[][..]).unwrap().capacity(), 10);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">Recover</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>) } <span class="doccomment">/// Removes a value from the set. Returns `true` if the value was</span> <span class="doccomment">/// present in the set.</span> <span class="doccomment">///</span> <span class="doccomment">/// The value may be any borrowed form of the set's value type,</span> <span class="doccomment">/// but the ordering on the borrowed form *must* match the</span> <span class="doccomment">/// ordering on the value type.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set = BTreeSet::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// set.insert(2);</span> <span class="doccomment">/// assert_eq!(set.remove(&2), true);</span> <span class="doccomment">/// assert_eq!(set.remove(&2), false);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">remove</span>(<span class="ident">value</span>).<span class="ident">is_some</span>() } <span class="doccomment">/// Removes and returns the value in the set, if any, that is equal to the given one.</span> <span class="doccomment">///</span> <span class="doccomment">/// The value may be any borrowed form of the set's value type,</span> <span class="doccomment">/// but the ordering on the borrowed form *must* match the</span> <span class="doccomment">/// ordering on the value type.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut set: BTreeSet<_> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// assert_eq!(set.take(&2), Some(2));</span> <span class="doccomment">/// assert_eq!(set.take(&2), None);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="ident">Recover</span>::<span class="ident">take</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>) } <span class="doccomment">/// Moves all elements from `other` into `Self`, leaving `other` empty.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">/// a.insert(2);</span> <span class="doccomment">/// a.insert(3);</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeSet::new();</span> <span class="doccomment">/// b.insert(3);</span> <span class="doccomment">/// b.insert(4);</span> <span class="doccomment">/// b.insert(5);</span> <span class="doccomment">///</span> <span class="doccomment">/// a.append(&mut b);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a.len(), 5);</span> <span class="doccomment">/// assert_eq!(b.len(), 0);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(a.contains(&1));</span> <span class="doccomment">/// assert!(a.contains(&2));</span> <span class="doccomment">/// assert!(a.contains(&3));</span> <span class="doccomment">/// assert!(a.contains(&4));</span> <span class="doccomment">/// assert!(a.contains(&5));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_append"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">other</span>.<span class="ident">map</span>); } <span class="doccomment">/// Splits the collection into two at the given key. Returns everything after the given key,</span> <span class="doccomment">/// including the key.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeSet::new();</span> <span class="doccomment">/// a.insert(1);</span> <span class="doccomment">/// a.insert(2);</span> <span class="doccomment">/// a.insert(3);</span> <span class="doccomment">/// a.insert(17);</span> <span class="doccomment">/// a.insert(41);</span> <span class="doccomment">///</span> <span class="doccomment">/// let b = a.split_off(&3);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a.len(), 2);</span> <span class="doccomment">/// assert_eq!(b.len(), 3);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(a.contains(&1));</span> <span class="doccomment">/// assert!(a.contains(&2));</span> <span class="doccomment">///</span> <span class="doccomment">/// assert!(b.contains(&3));</span> <span class="doccomment">/// assert!(b.contains(&17));</span> <span class="doccomment">/// assert!(b.contains(&41));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_split_off"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split_off</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Ord</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="self">Self</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span> { <span class="ident">BTreeSet</span> { <span class="ident">map</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">split_off</span>(<span class="ident">key</span>) } } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Gets an iterator that visits the values in the `BTreeSet` in ascending order.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let set: BTreeSet<usize> = [1, 2, 3].iter().cloned().collect();</span> <span class="doccomment">/// let mut set_iter = set.iter();</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&1));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&2));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&3));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), None);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Values returned by the iterator are returned in ascending order:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let set: BTreeSet<usize> = [3, 1, 2].iter().cloned().collect();</span> <span class="doccomment">/// let mut set_iter = set.iter();</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&1));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&2));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), Some(&3));</span> <span class="doccomment">/// assert_eq!(set_iter.next(), None);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">keys</span>() } } <span class="doccomment">/// Returns the number of elements in the set.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = BTreeSet::new();</span> <span class="doccomment">/// assert_eq!(v.len(), 0);</span> <span class="doccomment">/// v.insert(1);</span> <span class="doccomment">/// assert_eq!(v.len(), 1);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">len</span>() } <span class="doccomment">/// Returns `true` if the set contains no elements.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = BTreeSet::new();</span> <span class="doccomment">/// assert!(v.is_empty());</span> <span class="doccomment">/// v.insert(1);</span> <span class="doccomment">/// assert!(!v.is_empty());</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">FromIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">from_iter</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>(); <span class="ident">set</span>.<span class="ident">extend</span>(<span class="ident">iter</span>); <span class="ident">set</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="doccomment">/// Gets an iterator for moving out the `BTreeSet`'s contents.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let set: BTreeSet<usize> = [1, 2, 3, 4].iter().cloned().collect();</span> <span class="doccomment">///</span> <span class="doccomment">/// let v: Vec<_> = set.into_iter().collect();</span> <span class="doccomment">/// assert_eq!(v, [1, 2, 3, 4]);</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">IntoIter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">into_iter</span>() } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">Iter</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">Iter</span>) { <span class="kw">for</span> <span class="ident">elem</span> <span class="kw">in</span> <span class="ident">iter</span> { <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">elem</span>); } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extend_ref"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) { <span class="self">self</span>.<span class="ident">extend</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">cloned</span>()); } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Makes an empty `BTreeSet<T>` with a reasonable choice of B.</span> <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">BTreeSet</span>::<span class="ident">new</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">Sub</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="doccomment">/// Returns the difference of `self` and `rhs` as a new `BTreeSet<T>`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect();</span> <span class="doccomment">/// let b: BTreeSet<_> = vec![3, 4, 5].into_iter().collect();</span> <span class="doccomment">///</span> <span class="doccomment">/// let result = &a - &b;</span> <span class="doccomment">/// let result_vec: Vec<_> = result.into_iter().collect();</span> <span class="doccomment">/// assert_eq!(result_vec, [1, 2]);</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">difference</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">BitXor</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="doccomment">/// Returns the symmetric difference of `self` and `rhs` as a new `BTreeSet<T>`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect();</span> <span class="doccomment">/// let b: BTreeSet<_> = vec![2, 3, 4].into_iter().collect();</span> <span class="doccomment">///</span> <span class="doccomment">/// let result = &a ^ &b;</span> <span class="doccomment">/// let result_vec: Vec<_> = result.into_iter().collect();</span> <span class="doccomment">/// assert_eq!(result_vec, [1, 4]);</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">bitxor</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">symmetric_difference</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">BitAnd</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="doccomment">/// Returns the intersection of `self` and `rhs` as a new `BTreeSet<T>`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect();</span> <span class="doccomment">/// let b: BTreeSet<_> = vec![2, 3, 4].into_iter().collect();</span> <span class="doccomment">///</span> <span class="doccomment">/// let result = &a & &b;</span> <span class="doccomment">/// let result_vec: Vec<_> = result.into_iter().collect();</span> <span class="doccomment">/// assert_eq!(result_vec, [2, 3]);</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">bitand</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">intersection</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">BitOr</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>; <span class="doccomment">/// Returns the union of `self` and `rhs` as a new `BTreeSet<T>`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeSet;</span> <span class="doccomment">///</span> <span class="doccomment">/// let a: BTreeSet<_> = vec![1, 2, 3].into_iter().collect();</span> <span class="doccomment">/// let b: BTreeSet<_> = vec![3, 4, 5].into_iter().collect();</span> <span class="doccomment">///</span> <span class="doccomment">/// let result = &a | &b;</span> <span class="doccomment">/// let result_vec: Vec<_> = result.into_iter().collect();</span> <span class="doccomment">/// assert_eq!(result_vec, [1, 2, 3, 4, 5]);</span> <span class="doccomment">/// ```</span> <span class="kw">fn</span> <span class="ident">bitor</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">union</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_set</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">iter</span>()).<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>() } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>() } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">len</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>) } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">len</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Range</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>() } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="doccomment">/// Compare `x` and `y`, but return `short` if x is None and `long` if y is None</span> <span class="kw">fn</span> <span class="ident">cmp_opt</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span>(<span class="ident">x</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span>, <span class="ident">y</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span>, <span class="ident">short</span>: <span class="ident">Ordering</span>, <span class="ident">long</span>: <span class="ident">Ordering</span>) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="kw">match</span> (<span class="ident">x</span>, <span class="ident">y</span>) { (<span class="prelude-val">None</span>, <span class="kw">_</span>) <span class="op">=></span> <span class="ident">short</span>, (<span class="kw">_</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="ident">long</span>, (<span class="prelude-val">Some</span>(<span class="ident">x1</span>), <span class="prelude-val">Some</span>(<span class="ident">y1</span>)) <span class="op">=></span> <span class="ident">x1</span>.<span class="ident">cmp</span>(<span class="ident">y1</span>), } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Difference</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">b</span>: <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">clone</span>(), } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cmp_opt</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">peek</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">peek</span>(), <span class="ident">Less</span>, <span class="ident">Less</span>) { <span class="ident">Less</span> <span class="op">=></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(), <span class="ident">Equal</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(); <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); } <span class="ident">Greater</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); } } } } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">a_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">b_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">len</span>(); (<span class="ident">a_len</span>.<span class="ident">saturating_sub</span>(<span class="ident">b_len</span>), <span class="prelude-val">Some</span>(<span class="ident">a_len</span>)) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">SymmetricDifference</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">b</span>: <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">clone</span>(), } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cmp_opt</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">peek</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">peek</span>(), <span class="ident">Greater</span>, <span class="ident">Less</span>) { <span class="ident">Less</span> <span class="op">=></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(), <span class="ident">Equal</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(); <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); } <span class="ident">Greater</span> <span class="op">=></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(), } } } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">len</span>())) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Intersection</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">b</span>: <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">clone</span>(), } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">Ord</span>::<span class="ident">cmp</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">peek</span>()<span class="question-mark">?</span>, <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">peek</span>()<span class="question-mark">?</span>) { <span class="ident">Less</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(); } <span class="ident">Equal</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); <span class="kw">return</span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(); } <span class="ident">Greater</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); } } } } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">len</span>()))) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Union</span> { <span class="ident">a</span>: <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">clone</span>(), <span class="ident">b</span>: <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">clone</span>(), } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">cmp_opt</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">peek</span>(), <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">peek</span>(), <span class="ident">Greater</span>, <span class="ident">Less</span>) { <span class="ident">Less</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>(), <span class="ident">Equal</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(); <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">next</span>() } <span class="ident">Greater</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">next</span>(), } } <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">a_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">a</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">b_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">b</span>.<span class="ident">len</span>(); (<span class="ident">max</span>(<span class="ident">a_len</span>, <span class="ident">b_len</span>), <span class="prelude-val">Some</span>(<span class="ident">a_len</span> <span class="op">+</span> <span class="ident">b_len</span>)) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} </pre> </section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, 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