<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0.1 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Boost.MultiIndex Documentation - Ordered indices reference</title> <link rel="stylesheet" href="../style.css" type="text/css"> <link rel="start" href="../index.html"> <link rel="prev" href="indices.html"> <link rel="up" href="index.html"> <link rel="next" href="hash_indices.html"> </head> <body> <h1><img src="../../../../boost.png" alt="boost.png (6897 bytes)" align= "middle" width="277" height="86">Boost.MultiIndex Ordered indices reference</h1> <div class="prev_link"><a href="indices.html"><img src="../prev.gif" alt="index reference" border="0"><br> Index reference </a></div> <div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.MultiIndex reference" border="0"><br> Boost.MultiIndex reference </a></div> <div class="next_link"><a href="hash_indices.html"><img src="../next.gif" alt="hashed indices" border="0"><br> Hashed indices </a></div><br clear="all" style="clear: all;"> <hr> <h2>Contents</h2> <ul> <li><a href="#ord_index_fwd_synopsis">Header <code>"boost/multi_index/ordered_index_fwd.hpp"</code> synopsis</a></li> <li><a href="#synopsis">Header <code>"boost/multi_index/ordered_index.hpp"</code> synopsis</a> <ul> <li><a href="#unique_non_unique"> Index specifiers <code>ordered_unique</code> and <code>ordered_non_unique</code> </a></li> <li><a href="#ord_indices">Ordered indices</a> <ul> <li><a href="#complexity_signature">Complexity signature</a></li> <li><a href="#instantiation_types">Instantiation types</a></li> <li><a href="#constructors">Constructors, copy and assignment</a></li> <li><a href="#iterators">Iterators</a></li> <li><a href="#modifiers">Modifiers</a></li> <li><a href="#observers">Observers</a></li> <li><a href="#set_operations">Set operations</a></li> <li><a href="#range_operations">Range operations</a></li> <li><a href="#serialization">Serialization</a></li> </ul> </li> </ul> </li> </ul> <h2> <a name="ord_index_fwd_synopsis">Header <a href="../../../../boost/multi_index/ordered_index_fwd.hpp"> <code>"boost/multi_index/ordered_index_fwd.hpp"</code></a> synopsis</a></h2> <blockquote><pre> <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span> <span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span> <span class=comment>// index specifiers ordered_unique and ordered_non_unique</span> <span class=keyword>template</span><span class=special><</span><b>consult ordered_unique reference for arguments</b><span class=special>></span> <span class=keyword>struct</span> <span class=identifier>ordered_unique</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><b>consult ordered_non_unique reference for arguments</b><span class=special>></span> <span class=keyword>struct</span> <span class=identifier>ordered_non_unique</span><span class=special>;</span> <span class=comment>// indices</span> <span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span> <span class=keyword>template</span><span class=special><</span><b>implementation defined</b><span class=special>></span> <span class=keyword>class</span> <b>index name is implementation defined</b><span class=special>;</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index</span> <span class=special>}</span> <span class=comment>// namespace boost</span> </pre></blockquote> <p> <code>ordered_index_fwd.hpp</code> provides forward declarations for index specifiers <a href="#unique_non_unique"><code>ordered_unique</code> and <code>ordered_non_unique</code></a> and their associated <a href="#ord_indices">ordered index</a> classes. </p> <h2> <a name="synopsis">Header <a href="../../../../boost/multi_index/ordered_index.hpp"> <code>"boost/multi_index/ordered_index.hpp"</code></a> synopsis</a></h2> <blockquote><pre> <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span> <span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span> <span class=comment>// index specifiers ordered_unique and ordered_non_unique</span> <span class=keyword>template</span><span class=special><</span><b>consult ordered_unique reference for arguments</b><span class=special>></span> <span class=keyword>struct</span> <span class=identifier>ordered_unique</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><b>consult ordered_non_unique reference for arguments</b><span class=special>></span> <span class=keyword>struct</span> <span class=identifier>ordered_non_unique</span><span class=special>;</span> <span class=comment>// indices</span> <span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span> <span class=keyword>template</span><span class=special><</span><b>implementation defined</b><span class=special>></span> <span class=keyword>class</span> <b>index class name implementation defined</b><span class=special>;</span> <span class=comment>// index comparison:</span> <span class=comment>// <b>OP</b> is any of ==,<,!=,>,>=,<=</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span> <b><i>OP</i></b><span class=special>(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>);</span> <span class=comment>// index specialized algorithms:</span> <span class=keyword>template</span><span class=special><</span><b>implementation defined</b><span class=special>></span> <span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&</span> <span class=identifier>y</span><span class=special>);</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index</span> <span class=special>}</span> <span class=comment>// namespace boost</span> </pre></blockquote> <h3><a name="unique_non_unique"> Index specifiers <code>ordered_unique</code> and <code>ordered_non_unique</code> </a></h3> <p> These <a href="indices.html#index_specification">index specifiers</a> allow for insertion of <a href="#ord_indices">ordered indices</a> without and with allowance of duplicate elements, respectively. The syntax of <code>ordered_unique</code> and <code>ordered_non_unique</code> coincide, thus we describe them in a grouped manner. <code>ordered_unique</code> and <code>ordered_non_unique</code> can be instantiated in two different forms, according to whether a tag list for the index is provided or not: </p> <blockquote><pre> <span class=keyword>template</span><span class=special><</span> <span class=keyword>typename</span> <span class=identifier>KeyFromValue</span><span class=special>,</span> <span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>=</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>less</span><span class=special><</span><span class=identifier>KeyFromValue</span><span class=special>::</span><span class=identifier>result_type</span><span class=special>></span> <span class=special>></span> <span class=keyword>struct</span> <span class=special>(</span><span class=identifier>ordered_unique</span> <span class=special>|</span> <span class=identifier>ordered_non_unique</span><span class=special>)</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span> <span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>,</span> <span class=keyword>typename</span> <span class=identifier>KeyFromValue</span><span class=special>,</span> <span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>=</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>less</span><span class=special><</span><span class=identifier>KeyFromValue</span><span class=special>::</span><span class=identifier>result_type</span><span class=special>></span> <span class=special>></span> <span class=keyword>struct</span> <span class=special>(</span><span class=identifier>ordered_unique</span> <span class=special>|</span> <span class=identifier>ordered_non_unique</span><span class=special>)</span><span class=special>;</span> </pre></blockquote> <p> If provided, <code>TagList</code> must be an instantiation of the class template <a href="indices.html#tag"><code>tag</code></a>. The template arguments are used by the corresponding index implementation, refer to the <a href="#ord_indices">ordered indices</a> reference section for further explanations on their acceptable type values. </p> <h3><a name="ord_indices">Ordered indices</a></h3> <p> An ordered index provides a set-like interface to the underlying heap of elements contained in a <code>multi_index_container</code>. An ordered index is particularized according to a given <a href="key_extraction.html#key_extractors"><code>Key Extractor</code></a> that retrieves keys from elements of <code>multi_index_container</code> and a comparison predicate. </p> <p> There are two variants of ordered indices: <i>unique</i>, which do not allow duplicate elements (with respect to its associated comparison predicate) and <i>non-unique</i>, which accept those duplicates. The interface of these two variants is the same, so they are documented together, with minor differences explicitly stated when they exist. </p> <p> Except where noted, ordered indices (both unique and non-unique) are models of <a href="http://www.sgi.com/tech/stl/SortedAssociativeContainer.html"> <code>Sorted Associative Container</code></a> and <a href="http://www.sgi.com/tech/stl/UniqueAssociativeContainer.html"> <code>Unique Associative Container</code></a>, much as <code>std::set</code>s are. Accordingly, validity of iterators and references to elements is preserved. We only provide descriptions of those types and operations that are either not present in the concepts modeled or do not exactly conform to the requirements for these types of containers. </p> <blockquote><pre> <span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span> <span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span> <b>implementation defined </b><span class=identifier>unbounded</span><span class=special>;</span> <span class=comment>// see range()</span> <span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span> <span class=keyword>template</span><span class=special><</span><b>implementation defined: dependent on types Value, Allocator, TagList, KeyFromValue, Compare</b><span class=special>></span> <span class=keyword>class</span> <b>name is implementation defined</b> <span class=special>{</span> <span class=keyword>public</span><span class=special>:</span> <span class=comment>// types:</span> <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>KeyFromValue</span><span class=special>::</span><span class=identifier>result_type</span> <span class=identifier>key_type</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>Value</span> <span class=identifier>value_type</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>KeyFromValue</span> <span class=identifier>key_from_value</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>Compare</span> <span class=identifier>key_compare</span><span class=special>;</span> <span class=keyword>typedef</span> <b>implementation defined </b><span class=identifier>value_compare</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>tuple</span><span class=special><</span><span class=identifier>key_from_value</span><span class=special>,</span><span class=identifier>key_compare</span><span class=special>></span> <span class=identifier>ctor_args</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>TagList</span> <span class=identifier>tag_list</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=identifier>Allocator</span> <span class=identifier>allocator_type</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>::</span><span class=identifier>reference</span> <span class=identifier>reference</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>::</span><span class=identifier>const_reference</span> <span class=identifier>const_reference</span><span class=special>;</span> <span class=keyword>typedef</span> <b>implementation defined </b><span class=identifier>iterator</span><span class=special>;</span> <span class=keyword>typedef</span> <b>implementation defined </b><span class=identifier>const_iterator</span><span class=special>;</span> <span class=keyword>typedef</span> <b>implementation defined </b><span class=identifier>size_type</span><span class=special>;</span> <span class=keyword>typedef</span> <b>implementation defined </b><span class=identifier>difference_type</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>::</span><span class=identifier>pointer</span> <span class=identifier>pointer</span><span class=special>;</span> <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>Allocator</span><span class=special>::</span><span class=identifier>const_pointer</span> <span class=identifier>const_pointer</span><span class=special>;</span> <span class=keyword>typedef</span> <b>equivalent to std::reverse_iterator<iterator></b> <span class=identifier>reverse_iterator</span><span class=special>;</span> <span class=keyword>typedef</span> <b>equivalent to std::reverse_iterator<const_iterator></b> <span class=identifier>const_reverse_iterator</span><span class=special>;</span> <span class=comment>// construct/copy/destroy:</span> <b>index class name</b><span class=special>&</span> <span class=keyword>operator</span><span class=special>=(</span><span class=keyword>const</span> <b>index class name</b><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=identifier>allocator_type</span> <span class=identifier>get_allocator</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=comment>// iterators:</span> <span class=identifier>iterator</span> <span class=identifier>begin</span><span class=special>();</span> <span class=identifier>const_iterator</span> <span class=identifier>begin</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>iterator</span> <span class=identifier>end</span><span class=special>();</span> <span class=identifier>const_iterator</span> <span class=identifier>end</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>reverse_iterator</span> <span class=identifier>rbegin</span><span class=special>();</span> <span class=identifier>const_reverse_iterator</span> <span class=identifier>rbegin</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>reverse_iterator</span> <span class=identifier>rend</span><span class=special>();</span> <span class=identifier>const_reverse_iterator</span> <span class=identifier>rend</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>const_iterator</span> <span class=identifier>cbegin</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>const_iterator</span> <span class=identifier>cend</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>const_reverse_iterator</span> <span class=identifier>crbegin</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>const_reverse_iterator</span> <span class=identifier>crend</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>iterator</span> <span class=identifier>iterator_to</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=identifier>const_iterator</span> <span class=identifier>iterator_to</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=comment>// capacity:</span> <span class=keyword>bool</span> <span class=identifier>empty</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>size_type</span> <span class=identifier>size</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>size_type</span> <span class=identifier>max_size</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=comment>// modifiers:</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special><</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>></span> <span class=identifier>insert</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=identifier>iterator</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>InputIterator</span><span class=special>></span> <span class=keyword>void</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>InputIterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>InputIterator</span> <span class=identifier>last</span><span class=special>);</span> <span class=identifier>iterator</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>);</span> <span class=identifier>size_type</span> <span class=identifier>erase</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>key_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=identifier>iterator</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>last</span><span class=special>);</span> <span class=keyword>bool</span> <span class=identifier>replace</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>></span> <span class=keyword>bool</span> <span class=identifier>modify</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>);</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Rollback</span><span class=special>></span> <span class=keyword>bool</span> <span class=identifier>modify</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>,</span><span class=identifier>Rollback</span> <span class=identifier>back</span><span class=special>);</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>></span> <span class=keyword>bool</span> <span class=identifier>modify_key</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>);</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Rollback</span><span class=special>></span> <span class=keyword>bool</span> <span class=identifier>modify_key</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>,</span><span class=identifier>Rollback</span> <span class=identifier>back</span><span class=special>);</span> <span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&</span> <span class=identifier>x</span><span class=special>);</span> <span class=keyword>void</span> <span class=identifier>clear</span><span class=special>();</span> <span class=comment>// observers:</span> <span class=identifier>key_from_value</span> <span class=identifier>key_extractor</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>key_compare</span> <span class=identifier>key_comp</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=identifier>value_compare</span> <span class=identifier>value_comp</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span> <span class=comment>// set operations:</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>find</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>CompatibleCompare</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>find</span><span class=special>(</span> <span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>CompatibleCompare</span><span class=special>&</span> <span class=identifier>comp</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>></span> <span class=identifier>size_type</span> <span class=identifier>count</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>CompatibleCompare</span><span class=special>></span> <span class=identifier>size_type</span> <span class=identifier>count</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>CompatibleCompare</span><span class=special>&</span> <span class=identifier>comp</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>lower_bound</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>CompatibleCompare</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>lower_bound</span><span class=special>(</span> <span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>CompatibleCompare</span><span class=special>&</span> <span class=identifier>comp</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>upper_bound</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>CompatibleCompare</span><span class=special>></span> <span class=identifier>iterator</span> <span class=identifier>upper_bound</span><span class=special>(</span> <span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>CompatibleCompare</span><span class=special>&</span> <span class=identifier>comp</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>></span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special><</span><span class=identifier>iterator</span><span class=special>,</span><span class=identifier>iterator</span><span class=special>></span> <span class=identifier>equal_range</span><span class=special>(</span> <span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>CompatibleKey</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>CompatibleCompare</span><span class=special>></span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special><</span><span class=identifier>iterator</span><span class=special>,</span><span class=identifier>iterator</span><span class=special>></span> <span class=identifier>equal_range</span><span class=special>(</span> <span class=keyword>const</span> <span class=identifier>CompatibleKey</span><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>CompatibleCompare</span><span class=special>&</span> <span class=identifier>comp</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=comment>// range:</span> <span class=keyword>template</span><span class=special><</span><span class=keyword>typename</span> <span class=identifier>LowerBounder</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>UpperBounder</span><span class=special>></span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special><</span><span class=identifier>iterator</span><span class=special>,</span><span class=identifier>iterator</span><span class=special>></span> <span class=identifier>range</span><span class=special>(</span> <span class=identifier>LowerBounder</span> <span class=identifier>lower</span><span class=special>,</span><span class=identifier>UpperBounder</span> <span class=identifier>upper</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span> <span class=special>};</span> <span class=comment>// index comparison:</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>==(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=identifier>x</span><span class=special>.</span><span class=identifier>size</span><span class=special>()==</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>size</span><span class=special>()&&</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>equal</span><span class=special>(</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>begin</span><span class=special>());</span> <span class=special>}</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special><(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>lexicographical_compare</span><span class=special>(</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>end</span><span class=special>());</span> <span class=special>}</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>!=(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special>==</span><span class=identifier>y</span><span class=special>);</span> <span class=special>}</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>>(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=identifier>y</span><span class=special><</span><span class=identifier>x</span><span class=special>;</span> <span class=special>}</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>>=(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special><</span><span class=identifier>y</span><span class=special>);</span> <span class=special>}</span> <span class=keyword>template</span><span class=special><</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>></span> <span class=keyword>bool</span> <span class=keyword>operator</span><span class=special><=(</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 1</b><span class=special>>&</span> <span class=identifier>x</span><span class=special>,</span> <span class=keyword>const</span> <b>index class name</b><span class=special><</span><b>arg set 2</b><span class=special>>&</span> <span class=identifier>y</span><span class=special>)</span> <span class=special>{</span> <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special>></span><span class=identifier>y</span><span class=special>);</span> <span class=special>}</span> <span class=comment>// index specialized algorithms:</span> <span class=keyword>template</span><span class=special><</span><b>implementation defined</b><span class=special>></span> <span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&</span> <span class=identifier>y</span><span class=special>);</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span> <span class=special>}</span> <span class=comment>// namespace boost::multi_index</span> <span class=special>}</span> <span class=comment>// namespace boost</span> </pre></blockquote> <h4><a name="complexity_signature">Complexity signature</a></h4> <p> Here and in the descriptions of operations of ordered indices, we adopt the scheme outlined in the <a href="indices.html#complexity_signature">complexity signature section</a>. The complexity signature of ordered indices is: <ul> <li>copying: <code>c(n)=n*log(n)</code>,</li> <li>insertion: <code>i(n)=log(n)</code>,</li> <li>hinted insertion: <code>h(n)=1</code> (constant) if the hint element is immediately after the point of insertion, <code>h(n)=log(n)</code> otherwise,</li> <li>deletion: <code>d(n)=1</code> (amortized constant),</li> <li>replacement: <code>r(n)=1</code> (constant) if the element position does not change, <code>r(n)=log(n)</code> otherwise,</li> <li>modifying: <code>m(n)=1</code> (constant) if the element position does not change, <code>m(n)=log(n)</code> otherwise.</li> </ul> </p> <h4><a name="instantiation_types">Instantiation types</a></h4> <p>Ordered indices are instantiated internally to <code>multi_index_container</code> and specified by means of <a href="indices.html#indexed_by"><code>indexed_by</code></a> with <a href="#unique_non_unique"> index specifiers <code>ordered_unique</code> and <code>ordered_non_unique</code></a>. Instantiations are dependent on the following types: <ul> <li><code>Value</code> from <code>multi_index_container</code>,</li> <li><code>Allocator</code> from <code>multi_index_container</code>,</li> <li><code>TagList</code> from the index specifier (if provided, otherwise <code>tag<></code> is assumed),</li> <li><code>KeyFromValue</code> from the index specifier,</li> <li><code>Compare</code> from the index specifier.</li> </ul> <code>TagList</code> must be an instantiation of <a href="indices.html#tag"><code>tag</code></a>. The type <code>KeyFromValue</code>, which determines the mechanism for extracting a key from <code>Value</code>, must be a model of <a href="key_extraction.html#key_extractors"> <code>Key Extractor</code></a> from <code>Value</code>. <code>Compare</code> is a <a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html"> <code>Strict Weak Ordering</code></a> on elements of <code>KeyFromValue::result_type</code>. </p> <h4><a name="constructors">Constructors, copy and assignment</a></h4> <p> As explained in the <a href="indices.html#index_concepts">index concepts section</a>, indices do not have public constructors or destructors. Assignment, on the other hand, is provided. </p> <code><b>index class name</b>& operator=(const <b>index class name</b>& x);</code> <blockquote> <b>Effects:</b> <blockquote><pre> <span class=identifier>a</span><span class=special>=</span><span class=identifier>b</span><span class=special>;</span> </pre></blockquote> where <code>a</code> and <code>b</code> are the <code>multi_index_container</code> objects to which <code>*this</code> and <code>x</code> belong, respectively.<br> <b>Returns:</b> <code>*this</code>.<br> </blockquote> <h4><a name="iterators">Iterators</a></h4> <code>iterator iterator_to(const value_type& x);<br> const_iterator iterator_to(const value_type& x)const;</code> <blockquote> <b>Requires:</b> <code>x</code> is a reference to an element of the container.<br> <b>Returns:</b> An iterator to <code>x</code>.<br> <b>Complexity:</b> Constant.<br> <b>Exception safety:</b> <code>nothrow</code>.<br> </blockquote> <h4><a name="modifiers">Modifiers</a></h4> <code>std::pair<iterator,bool> insert(const value_type& x);</code> <blockquote> <b>Effects:</b> Inserts <code>x</code> into the <code>multi_index_container</code> to which the index belongs if <ul> <li>the index is non-unique OR no other element exists with equivalent key,</li> <li>AND insertion is allowed by all other indices of the <code>multi_index_container</code>.</li> </ul> <b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code> is <code>true</code> if and only if insertion took place. On successful insertion, <code>p.first</code> points to the element inserted; otherwise, <code>p.first</code> points to an element that caused the insertion to be banned. Note that more than one element can be causing insertion not to be allowed.<br> <b>Complexity:</b> <code>O(I(n))</code>.<br> <b>Exception safety:</b> Strong.<br> </blockquote> <code>iterator insert(iterator position,const value_type& x);</code> <blockquote> <b>Requires:</b> <code>position</code> is a valid iterator of the index.<br> <b>Effects:</b> Inserts <code>x</code> into the <code>multi_index_container</code> to which the index belongs if <ul> <li>the index is non-unique OR no other element exists with equivalent key,</li> <li>AND insertion is allowed by all other indices of the <code>multi_index_container</code>.</li> </ul> <code>position</code> is used as a hint to improve the efficiency of the operation. If succesful, insertion happens as close as possible to the location just prior to <code>position</code>.<br> <b>Returns:</b> On successful insertion, an iterator to the newly inserted element. Otherwise, an iterator to an element that caused the insertion to be banned. Note that more than one element can be causing insertion not to be allowed.<br> <b>Complexity:</b> <code>O(H(n))</code>.<br> <b>Exception safety:</b> Strong.<br> </blockquote> <code>template<typename InputIterator><br> void insert(InputIterator first,InputIterator last);</code> <blockquote> <b>Requires:</b> <code>InputIterator</code> is a model of <a href="http://www.sgi.com/tech/stl/InputIterator.html"> <code>Input Iterator</code></a> over elements of type <code>value_type</code> or a type convertible to <code>value_type</code>. <code>first</code> and <code>last</code> are not iterators into any index of the <code>multi_index_container</code> to which this index belongs. <code>last</code> is reachable from <code>first</code>.<br> <b>Effects:</b> <blockquote><pre> <span class=identifier>iterator</span> <span class=identifier>hint</span><span class=special>=</span><span class=identifier>end</span><span class=special>();</span> <span class=keyword>while</span><span class=special>(</span><span class=identifier>first</span><span class=special>!=</span><span class=identifier>last</span><span class=special>)</span><span class=identifier>hint</span><span class=special>=</span><span class=identifier>insert</span><span class=special>(</span><span class=identifier>hint</span><span class=special>,*</span><span class=identifier>first</span><span class=special>++);</span> </pre></blockquote> <b>Complexity:</b> <code>O(m*H(n+m))</code>, where <code>m</code> is the number of elements in [<code>first</code>, <code>last</code>).<br> <b>Exception safety:</b> Basic.<br> </blockquote> <code>iterator erase(iterator position);</code> <blockquote> <b>Requires:</b> <code>position</code> is a valid dereferenceable iterator of the index.<br> <b>Effects:</b> Deletes the element pointed to by <code>position</code>.<br> <b>Returns:</b> An iterator pointing to the element immediately following the one that was deleted, or <code>end()</code> if no such element exists.<br> <b>Complexity:</b> <code>O(D(n))</code>.<br> <b>Exception safety:</b> <code>nothrow</code>.<br> </blockquote> <code>size_type erase(const key_type& x);</code> <blockquote> <b>Effects:</b> Deletes the elements with key equivalent to <code>x</code>.<br> <b>Returns:</b> Number of elements deleted.<br> <b>Complexity:</b> <code>O(log(n) + m*D(n))</code>, where <code>m</code> is the number of elements deleted.<br> <b>Exception safety:</b> Basic.<br> </blockquote> <code>iterator erase(iterator first,iterator last);</code> <blockquote> <b>Requires:</b> [<code>first</code>,<code>last</code>) is a valid range of the index.<br> <b>Effects:</b> Deletes the elements in [<code>first</code>,<code>last</code>).<br> <b>Returns:</b> <code>last</code>.<br> <b>Complexity:</b> <code>O(log(n) + m*D(n))</code>, where <code>m</code> is the number of elements in [<code>first</code>,<code>last</code>).<br> <b>Exception safety:</b> <code>nothrow</code>.<br> </blockquote> <a name="replace"><code>bool replace(iterator position,const value_type& x);</code></a> <blockquote> <b>Requires:</b> <code>position</code> is a valid dereferenceable iterator of the index.<br> <b>Effects:</b> Assigns the value <code>x</code> to the element pointed to by <code>position</code> into the <code>multi_index_container</code> to which the index belongs if, for the value <code>x</code> <ul> <li>the index is non-unique OR no other element exists (except possibly <code>*position</code>) with equivalent key,</li> <li>AND replacing is allowed by all other indices of the <code>multi_index_container</code>.</li> </ul> <b>Postconditions:</b> Validity of <code>position</code> is preserved in all cases. If the key of the new value is equivalent to that of the replaced value, the position of the element does not change.<br> <b>Returns:</b> <code>true</code> if the replacement took place, <code>false</code> otherwise.<br> <b>Complexity:</b> <code>O(R(n))</code>.<br> <b>Exception safety:</b> Strong. If an exception is thrown by some user-provided operation the <code>multi_index_container</code> to which the index belongs remains in its original state. </blockquote> <a name="modify"> <code>template<typename Modifier> bool modify(iterator position,Modifier mod);</code></a> <blockquote> <b>Requires:</b> <code>Modifier</code> is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html"> <code>Unary Function</code></a> accepting arguments of type <code>value_type&</code>. <code>position</code> is a valid dereferenceable iterator of the index.<br> <b>Effects:</b> Calls <code>mod(e)</code> where <code>e</code> is the element pointed to by <code>position</code> and rearranges <code>*position</code> into all the indices of the <code>multi_index_container</code>. Rearrangement is successful if <ul> <li>the index is non-unique OR no other element exists with equivalent key,</li> <li>AND rearrangement is allowed by all other indices of the <code>multi_index_container</code>.</li> </ul> If the rearrangement fails, the element is erased.<br> <b>Postconditions:</b> Validity of <code>position</code> is preserved if the operation succeeds. If the key of the modified value is equivalent to that of the original value, the position of the element does not change.<br> <b>Returns:</b> <code>true</code> if the operation succeeded, <code>false</code> otherwise.<br> <b>Complexity:</b> <code>O(M(n))</code>.<br> <b>Exception safety:</b> Basic. If an exception is thrown by some user-provided operation (except possibly <code>mod</code>), then the element pointed to by <code>position</code> is erased. </blockquote> <code>template<typename Modifier,typename Rollback><br> bool modify(iterator position,Modifier mod,Rollback back);</code> <blockquote> <b>Requires:</b> <code>Modifier</code> and <code>Rollback</code> are models of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html"> <code>Unary Function</code></a> accepting arguments of type <code>value_type&</code>. <code>position</code> is a valid dereferenceable iterator of the index. The sequence of operations <code>mod(e)</code>, <code>back(e)</code>, where <code>e</code> is the element pointed to by <code>position</code>, restores all keys of the element to their original state.<br> <b>Effects:</b> Calls <code>mod(e)</code> where <code>e</code> is the element pointed to by <code>position</code> and tries to rearrange <code>*position</code> into all the indices of the <code>multi_index_container</code>. Rearrangement is successful if <ul> <li>the index is non-unique OR no other element exists with equivalent key,</li> <li>AND rearrangement is allowed by all other indices of the <code>multi_index_container</code>.</li> </ul> If the rearrangement fails, <code>back(e)</code> is invoked and the element is kept at its original position in all indices.<br> <b>Postconditions:</b> Validity of <code>position</code> is preserved except if the element is erased under the conditions described below. If the key of the modified value is equivalent to that of the original value, the position of the element does not change.<br> <b>Returns:</b> <code>true</code> if the operation succeeded, <code>false</code> otherwise.<br> <b>Complexity:</b> <code>O(M(n))</code>.<br> <b>Exception safety:</b> Strong, except if <code>back</code> throws an exception, in which case the modified element is erased. If <code>back</code> throws inside the handling code executing after some other user-provided operation has thrown, it is the exception generated by <code>back</code> that is rethrown. </blockquote> <a name="modify_key"> <code>template<typename Modifier> bool modify_key(iterator position,Modifier mod);</code></a> <blockquote> <b>Requires:</b> <code>key_from_value</code> is a read/write <a href="key_extraction.html#key_extractors"><code>Key Extractor</code></a> from <code>value_type</code>. <code>Modifier</code> is a model of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html"> <code>Unary Function</code></a> accepting arguments of type <code>key_type&</code>. <code>position</code> is a valid dereferenceable iterator of the index.<br> <b>Effects:</b> Equivalent to <code>modify(position,mod')</code>, with <code>mod'</code> defined in such a way that <code>mod'(x)</code> is the same as <code>mod(key(x))</code>, where <code>key</code> is the internal <code>KeyFromValue</code> object of the index. </blockquote> <code>template<typename Modifier,typename Rollback><br> bool modify_key(iterator position,Modifier mod,Rollback back);</code> <blockquote> <b>Requires:</b> <code>key_from_value</code> is a read/write <a href="key_extraction.html#key_extractors"><code>Key Extractor</code></a> from <code>value_type</code>. <code>Modifier</code> and <code>Rollback</code> are models of <a href="http://www.sgi.com/tech/stl/UnaryFunction.html"> <code>Unary Function</code></a> accepting arguments of type <code>key_type&</code>. <code>position</code> is a valid dereferenceable iterator of the index. The sequence of operations <code>mod(k)</code>, <code>back(k)</code>, where <code>k</code> is the key of the element pointed to by <code>position</code>, restores k to its original state.<br> <b>Effects:</b> Equivalent to <code>modify(position,mod',back')</code>, with <code>mod'</code> and <code>back</code> defined in such a way that <code>mod'(x)</code> is the same as <code>mod(key(x))</code> and <code>back'(x)</code> is the same as <code>back(key(x))</code>, where <code>key</code> is the internal <code>KeyFromValue</code> object of the index. </blockquote> <h4><a name="observers">Observers</a></h4> <p>Apart from standard <code>key_comp</code> and <code>value_comp</code>, ordered indices have a member function for retrieving the internal key extractor used. </p> <code>key_from_value key_extractor()const;</code> <blockquote> Returns a copy of the <code>key_from_value</code> object used to construct the index.<br> <b>Complexity:</b> Constant. </blockquote> <h4><a name="set_operations">Set operations</a></h4> <p> Ordered indices provide the full lookup functionality required by <a href="http://www.sgi.com/tech/stl/SortedAssociativeContainer.html"> <code>Sorted Associative Containers</code></a> and <a href="http://www.sgi.com/tech/stl/UniqueAssociativeContainer.html"> <code>Unique Associative Containers</code></a>, namely <code>find</code>, <code>count</code>, <code>lower_bound</code>, <code>upper_bound</code> and <code>equal_range</code>. Additionally, these member functions are templatized to allow for non-standard arguments, so extending the types of search operations allowed. The kind of arguments permissible when invoking the lookup member functions is defined by the following concept. </p> <p> Consider a <a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html"> <code>Strict Weak Ordering</code></a> <code>Compare</code> over values of type <code>Key</code>. A pair of types (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is said to be a <i>compatible extension</i> of <code>Compare</code> if <ol> <li><code>CompatibleCompare</code> is a <a href="http://www.sgi.com/tech/stl/BinaryPredicate.html"> <code>Binary Predicate</code></a> over (<code>Key</code>, <code>CompatibleKey</code>),</li> <li><code>CompatibleCompare</code> is a <a href="http://www.sgi.com/tech/stl/BinaryPredicate.html"> <code>Binary Predicate</code></a> over (<code>CompatibleKey</code>, <code>Key</code>),</li> <li>if <code>c_comp(ck,k1)</code> then <code>!c_comp(k1,ck)</code>,</li> <li>if <code>!c_comp(ck,k1)</code> and <code>!comp(k1,k2)</code> then <code>!c_comp(ck,k2)</code>,</li> <li>if <code>!c_comp(k1,ck)</code> and <code>!comp(k2,k1)</code> then <code>!c_comp(k2,ck)</code>,</li> </ol> for every <code>c_comp</code> of type <code>CompatibleCompare</code>, <code>comp</code> of type <code>Compare</code>, <code>ck</code> of type <code>CompatibleKey</code> and <code>k1</code>, <code>k2</code> of type <code>Key</code>. </p> <p>Additionally, a type <code>CompatibleKey</code> is said to be a <i>compatible key</i> of <code>Compare</code> if (<code>CompatibleKey</code>, <code>Compare</code>) is a compatible extension of <code>Compare</code>. This implies that <code>Compare</code>, as well as being a strict weak ordering, accepts arguments of type <code>CompatibleKey</code>, which usually means it has several overloads of <code>operator()</code>. </p> <p> In the context of a compatible extension or a compatible key, the expressions "equivalent", "less than" and "greater than" take on their obvious interpretations. </p> <code>template<typename CompatibleKey> iterator find(const CompatibleKey& x)const; </code> <blockquote> <b>Requires:</b> <code>CompatibleKey</code> is a compatible key of <code>key_compare</code>.<br> <b>Effects:</b> Returns a pointer to an element whose key is equivalent to <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey,typename CompatibleCompare><br> iterator find(const CompatibleKey& x,const CompatibleCompare& comp)const; </code> <blockquote> <b>Requires:</b> (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is a compatible extension of <code>key_compare</code>.<br> <b>Effects:</b> Returns a pointer to an element whose key is equivalent to <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey> size_type<br> count(const CompatibleKey& x)const; </code> <blockquote> <b>Requires:</b> <code>CompatibleKey</code> is a compatible key of <code>key_compare</code>.<br> <b>Effects:</b> Returns the number of elements with key equivalent to <code>x</code>.<br> <b>Complexity:</b> <code>O(log(n) + count(x))</code>.<br> </blockquote> <code>template<typename CompatibleKey,typename CompatibleCompare><br> size_type count(const CompatibleKey& x,const CompatibleCompare& comp)const; </code> <blockquote> <b>Requires:</b> (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is a compatible extension of <code>key_compare</code>.<br> <b>Effects:</b> Returns the number of elements with key equivalent to <code>x</code>.<br> <b>Complexity:</b> <code>O(log(n) + count(x,comp))</code>.<br> </blockquote> <code>template<typename CompatibleKey><br> iterator lower_bound(const CompatibleKey& x)const; </code> <blockquote> <b>Requires:</b> <code>CompatibleKey</code> is a compatible key of <code>key_compare</code>.<br> <b>Effects:</b> Returns an iterator pointing to the first element with key not less than <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey,typename CompatibleCompare><br> iterator lower_bound(const CompatibleKey& x,const CompatibleCompare& comp)const; </code> <blockquote> <b>Requires:</b> (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is a compatible extension of <code>key_compare</code>.<br> <b>Effects:</b> Returns an iterator pointing to the first element with key not less than <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey><br> iterator upper_bound(const CompatibleKey& x)const; </code> <blockquote> <b>Requires:</b> <code>CompatibleKey</code> is a compatible key of <code>key_compare</code>.<br> <b>Effects:</b> Returns an iterator pointing to the first element with key greater than <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey,typename CompatibleCompare><br> iterator upper_bound(const CompatibleKey& x,const CompatibleCompare& comp)const; </code> <blockquote> <b>Requires:</b> (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is a compatible extension of <code>key_compare</code>.<br> <b>Effects:</b> Returns an iterator pointing to the first element with key greater than <code>x</code>, or <code>end()</code> if such an element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey><br> std::pair<iterator,iterator> equal_range(<br> const CompatibleKey& x)const; </code> <blockquote> <b>Requires:</b> <code>CompatibleKey</code> is a compatible key of <code>key_compare</code>.<br> <b>Effects:</b> Equivalent to <code>make_pair(lower_bound(x),upper_bound(x))</code>.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <code>template<typename CompatibleKey,typename CompatibleCompare><br> std::pair<iterator,iterator> equal_range(<br> const CompatibleKey& x,const CompatibleCompare& comp)const; </code> <blockquote> <b>Requires:</b> (<code>CompatibleKey</code>, <code>CompatibleCompare</code>) is a compatible extension of <code>key_compare</code>.<br> <b>Effects:</b> Equivalent to <code>make_pair(lower_bound(x,comp),upper_bound(x,comp))</code>.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> </blockquote> <h4><a name="range_operations">Range operations</a></h4> <p> The member function <code>range</code> is not defined for sorted associative containers, but ordered indices provide it as a convenient utility. A range or interval is defined by two conditions for the lower and upper bounds, which are modeled after the following concepts. </p> <p> Consider a <a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html"> <code>Strict Weak Ordering</code></a> <code>Compare</code> over values of type <code>Key</code>. A type <code>LowerBounder</code> is said to be a <i>lower bounder</i> of <code>Compare</code> if <ol> <li><code>LowerBounder</code> is a <a href="http://www.sgi.com/tech/stl/Predicate.html"> <code>Predicate</code></a> over <code>Key</code>,</li> <li>if <code>lower(k1)</code> and <code>!comp(k2,k1)</code> then <code>lower(k2)</code>,</li> </ol> for every <code>lower</code> of type <code>LowerBounder</code>, <code>comp</code> of type <code>Compare</code>, and <code>k1</code>, <code>k2</code> of type <code>Key</code>. Similarly, an <i>upper bounder</i> is a type <code>UpperBounder</code> such that <ol> <li><code>UpperBounder</code> is a <a href="http://www.sgi.com/tech/stl/Predicate.html"> <code>Predicate</code></a> over <code>Key</code>,</li> <li>if <code>upper(k1)</code> and <code>!comp(k1,k2)</code> then <code>upper(k2)</code>,</li> </ol> for every <code>upper</code> of type <code>UpperBounder</code>, <code>comp</code> of type <code>Compare</code>, and <code>k1</code>, <code>k2</code> of type <code>Key</code>. </p> <code>template<typename LowerBounder,typename UpperBounder><br> std::pair<iterator,iterator> range(<br> LowerBounder lower,UpperBounder upper)const; </code> <blockquote> <b>Requires:</b> <code>LowerBounder</code> and <code>UpperBounder</code> are a lower and upper bounder of <code>key_compare</code>, respectively.<br> <b>Effects:</b> Returns a pair of iterators pointing to the beginning and one past the end of the subsequence of elements satisfying <code>lower</code> and <code>upper</code> simultaneously. If no such elements exist, the iterators both point to the first element satisfying <code>lower</code>, or else are equal to <code>end()</code> if this latter element does not exist.<br> <b>Complexity:</b> <code>O(log(n))</code>.<br> <b>Variants:</b> In place of <code>lower</code> or <code>upper</code> (or both), the singular value <code>boost::multi_index::unbounded</code> can be provided. This acts as a predicate which all values of type <code>key_type</code> satisfy.<br> </blockquote> <h4><a name="serialization">Serialization</a></h4> <p> Indices cannot be serialized on their own, but only as part of the <code>multi_index_container</code> into which they are embedded. In describing the additional preconditions and guarantees associated to ordered indices with respect to serialization of their embedding containers, we use the concepts defined in the <code>multi_index_container</code> <a href="multi_index_container.html#serialization">serialization section</a>. </p> Operation: saving of a <code>multi_index_container</code> <code>m</code> to an output archive (XML archive) <code>ar</code>. <blockquote> <b>Requires:</b> No additional requirements to those imposed by the container. </blockquote> Operation: loading of a <code>multi_index_container</code> <code>m'</code> from an input archive (XML archive) <code>ar</code>. <blockquote> <b>Requires:</b> Additionally to the general requirements, <code>value_comp()</code> must be serialization-compatible with <code>m.get<i>().value_comp()</code>, where <code>i</code> is the position of the ordered index in the container.<br> <b>Postconditions:</b> On succesful loading, each of the elements of [<code>begin()</code>, <code>end()</code>) is a restored copy of the corresponding element in [<code>m.get<i>().begin()</code>, <code>m.get<i>().end()</code>). </blockquote> Operation: saving of an <code>iterator</code> or <code>const_iterator</code> <code>it</code> to an output archive (XML archive) <code>ar</code>. <blockquote> <b>Requires:</b> <code>it</code> is a valid iterator of the index. The associated <code>multi_index_container</code> has been previously saved. </blockquote> Operation: loading of an <code>iterator</code> or <code>const_iterator</code> <code>it'</code> from an input archive (XML archive) <code>ar</code>. <blockquote> <b>Postconditions:</b> On succesful loading, if <code>it</code> was dereferenceable then <code>*it'</code> is the restored copy of <code>*it</code>, otherwise <code>it'==end()</code>.<br> <b>Note:</b> It is allowed that <code>it</code> be a <code>const_iterator</code> and the restored <code>it'</code> an <code>iterator</code>, or viceversa. </blockquote> <hr> <div class="prev_link"><a href="indices.html"><img src="../prev.gif" alt="index reference" border="0"><br> Index reference </a></div> <div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.MultiIndex reference" border="0"><br> Boost.MultiIndex reference </a></div> <div class="next_link"><a href="hash_indices.html"><img src="../next.gif" alt="hashed indices" border="0"><br> Hashed indices </a></div><br clear="all" style="clear: all;"> <br> <p>Revised December 21st 2009</p> <p>© Copyright 2003-2009 Joaquín M López Muñoz. Distributed under the Boost Software License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt"> LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt"> http://www.boost.org/LICENSE_1_0.txt</a>) </p> </body> </html>