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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2014 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="doccomment">//! Additional functionality for numerics.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module provides some extra types that are useful when doing numerical</span>
<span class="doccomment">//! work. See the individual documentation for each piece for more information.</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">allow</span>(<span class="ident">missing_docs</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">use</span> <span class="ident">core</span>::<span class="ident">num</span>::{<span class="ident">FpCategory</span>, <span class="ident">ParseIntError</span>, <span class="ident">ParseFloatError</span>, <span class="ident">TryFromIntError</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">use</span> <span class="ident">core</span>::<span class="ident">num</span>::<span class="ident">Wrapping</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">use</span> <span class="ident">fmt</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">Add</span>, <span class="ident">Sub</span>, <span class="ident">Mul</span>, <span class="ident">Div</span>, <span class="ident">Rem</span>};
<span class="doccomment">/// Helper function for testing numeric operations</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">test_num</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">ten</span>: <span class="ident">T</span>, <span class="ident">two</span>: <span class="ident">T</span>) <span class="kw">where</span>
<span class="ident">T</span>: <span class="ident">PartialEq</span>
<span class="op">+</span> <span class="ident">Add</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">Sub</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span>
<span class="op">+</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span>
<span class="op">+</span> <span class="ident">Rem</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>
<span class="op">+</span> <span class="ident">Copy</span>
{
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ten</span>.<span class="ident">add</span>(<span class="ident">two</span>), <span class="ident">ten</span> <span class="op">+</span> <span class="ident">two</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ten</span>.<span class="ident">sub</span>(<span class="ident">two</span>), <span class="ident">ten</span> <span class="op">-</span> <span class="ident">two</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ten</span>.<span class="ident">mul</span>(<span class="ident">two</span>), <span class="ident">ten</span> <span class="op">*</span> <span class="ident">two</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ten</span>.<span class="ident">div</span>(<span class="ident">two</span>), <span class="ident">ten</span> <span class="op">/</span> <span class="ident">two</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ten</span>.<span class="ident">rem</span>(<span class="ident">two</span>), <span class="ident">ten</span> <span class="op">%</span> <span class="ident">two</span>);
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">u8</span>;
<span class="kw">use</span> <span class="ident">u16</span>;
<span class="kw">use</span> <span class="ident">u32</span>;
<span class="kw">use</span> <span class="ident">u64</span>;
<span class="kw">use</span> <span class="ident">usize</span>;
<span class="kw">use</span> <span class="ident">ops</span>::<span class="ident">Mul</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_saturating_add_uint</span>() {
<span class="kw">use</span> <span class="ident">usize</span>::<span class="ident">MAX</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3_usize</span>.<span class="ident">saturating_add</span>(<span class="number">5_usize</span>), <span class="number">8_usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3_usize</span>.<span class="ident">saturating_add</span>(<span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MAX</span>.<span class="ident">saturating_add</span>(<span class="ident">MAX</span>), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">MAX</span><span class="op">-</span><span class="number">2</span>).<span class="ident">saturating_add</span>(<span class="number">1</span>), <span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_saturating_sub_uint</span>() {
<span class="kw">use</span> <span class="ident">usize</span>::<span class="ident">MAX</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">saturating_sub</span>(<span class="number">3_usize</span>), <span class="number">2_usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3_usize</span>.<span class="ident">saturating_sub</span>(<span class="number">5_usize</span>), <span class="number">0_usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0_usize</span>.<span class="ident">saturating_sub</span>(<span class="number">1_usize</span>), <span class="number">0_usize</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>).<span class="ident">saturating_sub</span>(<span class="ident">MAX</span>), <span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_saturating_add_int</span>() {
<span class="kw">use</span> <span class="ident">isize</span>::{<span class="ident">MIN</span>,<span class="ident">MAX</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3i32</span>.<span class="ident">saturating_add</span>(<span class="number">5</span>), <span class="number">8</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3isize</span>.<span class="ident">saturating_add</span>(<span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MAX</span>.<span class="ident">saturating_add</span>(<span class="ident">MAX</span>), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">MAX</span><span class="op">-</span><span class="number">2</span>).<span class="ident">saturating_add</span>(<span class="number">1</span>), <span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3i32</span>.<span class="ident">saturating_add</span>(<span class="op">-</span><span class="number">5</span>), <span class="op">-</span><span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MIN</span>.<span class="ident">saturating_add</span>(<span class="op">-</span><span class="number">1</span>), <span class="ident">MIN</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="op">-</span><span class="number">2isize</span>).<span class="ident">saturating_add</span>(<span class="op">-</span><span class="ident">MAX</span>), <span class="ident">MIN</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_saturating_sub_int</span>() {
<span class="kw">use</span> <span class="ident">isize</span>::{<span class="ident">MIN</span>,<span class="ident">MAX</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3i32</span>.<span class="ident">saturating_sub</span>(<span class="number">5</span>), <span class="op">-</span><span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MIN</span>.<span class="ident">saturating_sub</span>(<span class="number">1</span>), <span class="ident">MIN</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="op">-</span><span class="number">2isize</span>).<span class="ident">saturating_sub</span>(<span class="ident">MAX</span>), <span class="ident">MIN</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3i32</span>.<span class="ident">saturating_sub</span>(<span class="op">-</span><span class="number">5</span>), <span class="number">8</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3isize</span>.<span class="ident">saturating_sub</span>(<span class="op">-</span>(<span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>)), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MAX</span>.<span class="ident">saturating_sub</span>(<span class="op">-</span><span class="ident">MAX</span>), <span class="ident">MAX</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">MAX</span><span class="op">-</span><span class="number">2</span>).<span class="ident">saturating_sub</span>(<span class="op">-</span><span class="number">1</span>), <span class="ident">MAX</span><span class="op">-</span><span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_checked_add</span>() {
<span class="kw">let</span> <span class="ident">five_less</span> <span class="op">=</span> <span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">5</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">0</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">5</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">3</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">4</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">5</span>), <span class="prelude-val">Some</span>(<span class="ident">usize</span>::<span class="ident">MAX</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">6</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">five_less</span>.<span class="ident">checked_add</span>(<span class="number">7</span>), <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_checked_sub</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">0</span>), <span class="prelude-val">Some</span>(<span class="number">5</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">3</span>), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">4</span>), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">5</span>), <span class="prelude-val">Some</span>(<span class="number">0</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">6</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5_usize</span>.<span class="ident">checked_sub</span>(<span class="number">7</span>), <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_checked_mul</span>() {
<span class="kw">let</span> <span class="ident">third</span> <span class="op">=</span> <span class="ident">usize</span>::<span class="ident">MAX</span> <span class="op">/</span> <span class="number">3</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">third</span>.<span class="ident">checked_mul</span>(<span class="number">0</span>), <span class="prelude-val">Some</span>(<span class="number">0</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">third</span>.<span class="ident">checked_mul</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="ident">third</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">third</span>.<span class="ident">checked_mul</span>(<span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="ident">third</span> <span class="op">*</span> <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">third</span>.<span class="ident">checked_mul</span>(<span class="number">3</span>), <span class="prelude-val">Some</span>(<span class="ident">third</span> <span class="op">*</span> <span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">third</span>.<span class="ident">checked_mul</span>(<span class="number">4</span>), <span class="prelude-val">None</span>);
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_is_power_of_two</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span>) <span class="op">=></span> (
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>() {
<span class="attribute">#![<span class="ident">test</span>]</span>
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">false</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">1</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">2</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">3</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">false</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">4</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">5</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">false</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>::<span class="ident">MAX</span> <span class="op">/</span> <span class="number">2</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">is_power_of_two</span>(), <span class="bool-val">true</span>);
}
)
}
<span class="macro">test_is_power_of_two</span><span class="macro">!</span>{ <span class="ident">test_is_power_of_two_u8</span>, <span class="ident">u8</span> }
<span class="macro">test_is_power_of_two</span><span class="macro">!</span>{ <span class="ident">test_is_power_of_two_u16</span>, <span class="ident">u16</span> }
<span class="macro">test_is_power_of_two</span><span class="macro">!</span>{ <span class="ident">test_is_power_of_two_u32</span>, <span class="ident">u32</span> }
<span class="macro">test_is_power_of_two</span><span class="macro">!</span>{ <span class="ident">test_is_power_of_two_u64</span>, <span class="ident">u64</span> }
<span class="macro">test_is_power_of_two</span><span class="macro">!</span>{ <span class="ident">test_is_power_of_two_uint</span>, <span class="ident">usize</span> }
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_next_power_of_two</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span>) <span class="op">=></span> (
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>() {
<span class="attribute">#![<span class="ident">test</span>]</span>
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">next_power_of_two</span>(), <span class="number">1</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">next_power</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">1</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>..<span class="number">40</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>.<span class="ident">next_power_of_two</span>(), <span class="ident">next_power</span>);
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">next_power</span> { <span class="ident">next_power</span> <span class="op">*=</span> <span class="number">2</span> }
}
}
)
}
<span class="macro">test_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_next_power_of_two_u8</span>, <span class="ident">u8</span> }
<span class="macro">test_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_next_power_of_two_u16</span>, <span class="ident">u16</span> }
<span class="macro">test_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_next_power_of_two_u32</span>, <span class="ident">u32</span> }
<span class="macro">test_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_next_power_of_two_u64</span>, <span class="ident">u64</span> }
<span class="macro">test_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_next_power_of_two_uint</span>, <span class="ident">usize</span> }
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_checked_next_power_of_two</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>:<span class="ident">ident</span>) <span class="op">=></span> (
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// FIXME(#39119)</span>
<span class="kw">fn</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">test_name</span>() {
<span class="attribute">#![<span class="ident">test</span>]</span>
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="number">0</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>).<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>));
<span class="kw">let</span> <span class="ident">smax</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>::<span class="ident">MAX</span> <span class="op">>></span> <span class="number">1</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">smax</span>.<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">Some</span>(<span class="ident">smax</span><span class="op">+</span><span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">smax</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">Some</span>(<span class="ident">smax</span> <span class="op">+</span> <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="ident">smax</span> <span class="op">+</span> <span class="number">2</span>).<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="number">1</span>).<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>::<span class="ident">MAX</span>.<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">next_power</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">1</span> <span class="kw">as</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">T</span>..<span class="number">40</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>.<span class="ident">checked_next_power_of_two</span>(), <span class="prelude-val">Some</span>(<span class="ident">next_power</span>));
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">next_power</span> { <span class="ident">next_power</span> <span class="op">*=</span> <span class="number">2</span> }
}
}
)
}
<span class="macro">test_checked_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_checked_next_power_of_two_u8</span>, <span class="ident">u8</span> }
<span class="macro">test_checked_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_checked_next_power_of_two_u16</span>, <span class="ident">u16</span> }
<span class="macro">test_checked_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_checked_next_power_of_two_u32</span>, <span class="ident">u32</span> }
<span class="macro">test_checked_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_checked_next_power_of_two_u64</span>, <span class="ident">u64</span> }
<span class="macro">test_checked_next_power_of_two</span><span class="macro">!</span> { <span class="ident">test_checked_next_power_of_two_uint</span>, <span class="ident">usize</span> }
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_pow</span>() {
<span class="kw">fn</span> <span class="ident">naive_pow</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Mul</span><span class="op"><</span><span class="ident">Output</span><span class="op">=</span><span class="ident">T</span><span class="op">></span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span>(<span class="ident">one</span>: <span class="ident">T</span>, <span class="ident">base</span>: <span class="ident">T</span>, <span class="ident">exp</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span> {
(<span class="number">0</span>..<span class="ident">exp</span>).<span class="ident">fold</span>(<span class="ident">one</span>, <span class="op">|</span><span class="ident">acc</span>, _<span class="op">|</span> <span class="ident">acc</span> <span class="op">*</span> <span class="ident">base</span>)
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">assert_pow</span> {
((<span class="macro-nonterminal">$</span><span class="macro-nonterminal">num</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">exp</span>:<span class="ident">expr</span>) <span class="op">=></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>:<span class="ident">expr</span>) <span class="op">=></span> {{
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">num</span>.<span class="ident">pow</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exp</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expected</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="ident">naive_pow</span>(<span class="number">1</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">num</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">exp</span>));
}}
}
<span class="macro">assert_pow</span><span class="macro">!</span>((<span class="number">3u32</span>, <span class="number">0</span> ) <span class="op">=></span> <span class="number">1</span>);
<span class="macro">assert_pow</span><span class="macro">!</span>((<span class="number">5u32</span>, <span class="number">1</span> ) <span class="op">=></span> <span class="number">5</span>);
<span class="macro">assert_pow</span><span class="macro">!</span>((<span class="op">-</span><span class="number">4i32</span>, <span class="number">2</span> ) <span class="op">=></span> <span class="number">16</span>);
<span class="macro">assert_pow</span><span class="macro">!</span>((<span class="number">8u32</span>, <span class="number">3</span> ) <span class="op">=></span> <span class="number">512</span>);
<span class="macro">assert_pow</span><span class="macro">!</span>((<span class="number">2u64</span>, <span class="number">50</span>) <span class="op">=></span> <span class="number">1125899906842624</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_uint_to_str_overflow</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u8_val</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">255</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u8_val</span>.<span class="ident">to_string</span>(), <span class="string">"255"</span>);
<span class="ident">u8_val</span> <span class="op">=</span> <span class="ident">u8_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u8_val</span>.<span class="ident">to_string</span>(), <span class="string">"0"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u16_val</span>: <span class="ident">u16</span> <span class="op">=</span> <span class="number">65_535</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u16_val</span>.<span class="ident">to_string</span>(), <span class="string">"65535"</span>);
<span class="ident">u16_val</span> <span class="op">=</span> <span class="ident">u16_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u16_val</span>.<span class="ident">to_string</span>(), <span class="string">"0"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u32_val</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">4_294_967_295</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u32_val</span>.<span class="ident">to_string</span>(), <span class="string">"4294967295"</span>);
<span class="ident">u32_val</span> <span class="op">=</span> <span class="ident">u32_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u32_val</span>.<span class="ident">to_string</span>(), <span class="string">"0"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u64_val</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">18_446_744_073_709_551_615</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u64_val</span>.<span class="ident">to_string</span>(), <span class="string">"18446744073709551615"</span>);
<span class="ident">u64_val</span> <span class="op">=</span> <span class="ident">u64_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">u64_val</span>.<span class="ident">to_string</span>(), <span class="string">"0"</span>);
}
<span class="kw">fn</span> <span class="ident">from_str</span><span class="op"><</span><span class="ident">T</span>: ::<span class="ident">str</span>::<span class="ident">FromStr</span><span class="op">></span>(<span class="ident">t</span>: <span class="kw-2">&</span><span class="ident">str</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">str</span>::<span class="ident">FromStr</span>::<span class="ident">from_str</span>(<span class="ident">t</span>).<span class="ident">ok</span>()
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_uint_from_str_overflow</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u8_val</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="number">255</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span>(<span class="string">"255"</span>), <span class="prelude-val">Some</span>(<span class="ident">u8_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span>(<span class="string">"256"</span>), <span class="prelude-val">None</span>);
<span class="ident">u8_val</span> <span class="op">=</span> <span class="ident">u8_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span>(<span class="string">"0"</span>), <span class="prelude-val">Some</span>(<span class="ident">u8_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u8</span><span class="op">></span>(<span class="string">"-1"</span>), <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u16_val</span>: <span class="ident">u16</span> <span class="op">=</span> <span class="number">65_535</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u16</span><span class="op">></span>(<span class="string">"65535"</span>), <span class="prelude-val">Some</span>(<span class="ident">u16_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u16</span><span class="op">></span>(<span class="string">"65536"</span>), <span class="prelude-val">None</span>);
<span class="ident">u16_val</span> <span class="op">=</span> <span class="ident">u16_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u16</span><span class="op">></span>(<span class="string">"0"</span>), <span class="prelude-val">Some</span>(<span class="ident">u16_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u16</span><span class="op">></span>(<span class="string">"-1"</span>), <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u32_val</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">4_294_967_295</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>(<span class="string">"4294967295"</span>), <span class="prelude-val">Some</span>(<span class="ident">u32_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>(<span class="string">"4294967296"</span>), <span class="prelude-val">None</span>);
<span class="ident">u32_val</span> <span class="op">=</span> <span class="ident">u32_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>(<span class="string">"0"</span>), <span class="prelude-val">Some</span>(<span class="ident">u32_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>(<span class="string">"-1"</span>), <span class="prelude-val">None</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">u64_val</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">18_446_744_073_709_551_615</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>(<span class="string">"18446744073709551615"</span>), <span class="prelude-val">Some</span>(<span class="ident">u64_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>(<span class="string">"18446744073709551616"</span>), <span class="prelude-val">None</span>);
<span class="ident">u64_val</span> <span class="op">=</span> <span class="ident">u64_val</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>(<span class="string">"0"</span>), <span class="prelude-val">Some</span>(<span class="ident">u64_val</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">from_str</span>::<span class="op"><</span><span class="ident">u64</span><span class="op">></span>(<span class="string">"-1"</span>), <span class="prelude-val">None</span>);
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">bench</span> {
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">test</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">test</span>::<span class="ident">Bencher</span>;
<span class="attribute">#[<span class="ident">bench</span>]</span>
<span class="kw">fn</span> <span class="ident">bench_pow_function</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Bencher</span>) {
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> (<span class="number">0</span>..<span class="number">1024</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u32</span><span class="op">>></span>();
<span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> {<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="number">0u32</span>, <span class="op">|</span><span class="ident">old</span>, <span class="ident">new</span><span class="op">|</span> <span class="ident">old</span>.<span class="ident">pow</span>(<span class="kw-2">*</span><span class="ident">new</span> <span class="kw">as</span> <span class="ident">u32</span>));});
}
}
</pre>
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