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<h1><img src="../../../../boost.png" alt="boost.png (6897 bytes)" align=
"middle" width="277" height="86">Boost.MultiIndex Sequenced indices reference</h1>
<div class="prev_link"><a href="hash_indices.html"><img src="../prev.gif" alt="hashed indices" border="0"><br>
Hashed indices
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Boost.MultiIndex reference
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Random access indices
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<h2>Contents</h2>
<ul>
<li><a href="#seq_index_fwd_synopsis">Header
<code>"boost/multi_index/sequenced_index_fwd.hpp"</code> synopsis</a></li>
<li><a href="#synopsis">Header
<code>"boost/multi_index/sequenced_index.hpp"</code> synopsis</a>
<ul>
<li><a href="#sequenced"><code>sequenced</code> index specifier</a></li>
<li><a href="#seq_indices">Sequenced 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="#capacity">Capacity operations</a></li>
<li><a href="#modifiers">Modifiers</a></li>
<li><a href="#list_operations">List operations</a></li>
<li><a href="#rearrange_operations">Rearrange operations</a></li>
<li><a href="#serialization">Serialization</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<h2>
<a name="seq_index_fwd_synopsis">Header
<a href="../../../../boost/multi_index/sequenced_index_fwd.hpp">
<code>"boost/multi_index/sequenced_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>// sequenced index specifier</span>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>sequenced</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>&lt;</span><b>implementation defined</b><span class=special>&gt;</span> <span class=keyword>class</span> <b>index class name 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>sequenced_index_fwd.hpp</code> provides forward declarations for the
<a href="#sequenced"><code>sequenced</code></a> index specifier and
its associated <a href="#seq_indices">sequenced index</a> class.
</p>
<h2>
<a name="synopsis">Header
<a href="../../../../boost/multi_index/sequenced_index.hpp">
<code>"boost/multi_index/sequenced_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>// sequenced index specifier</span>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>sequenced</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>&lt;</span><b>implementation defined</b><span class=special>&gt;</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 ==,&lt;,!=,&gt;,&gt;=,&lt;=</span>
<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</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>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&lt;</span><b>implementation defined</b><span class=special>&gt;</span>
<span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</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="sequenced">
<code>sequenced</code> index specifier
</a></h3>
<p>
This index specifier allows for insertion of a <a href="#seq_indices">sequenced
index</a>.</p>
<blockquote><pre>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>sequenced</span><span class=special>;</span>
</pre></blockquote>
<p>If provided, <code>TagList</code> must be an instantiation of
<a href="indices.html#tag"><code>tag</code></a>.
</p>
<h3><a name="seq_indices">Sequenced indices</a></h3>
<p>
Sequenced indices are modeled after the semantics of a bidirectional list
like <code>std::list</code>. Elements in a sequenced index are by default
sorted according to their order of insertion: this means that new elements
inserted through a different index of the <code>multi_index_container</code> are appended
to the end of the sequenced index. Additionally, the index allows for free
reordering of elements in the same vein as <code>std::list</code> does. Validity
of iterators and references to elements is preserved in all operations.
</p>
<p>
There are a number of differences with respect to <code>std::lists</code>:
<ul>
<li>Sequenced indices are not <a href="http://www.sgi.com/tech/stl/Assignable.html">
<code>Assignable</code></a> (like any other index.)</li>
<li>Unlike as in <code>std::list</code>, insertions into a sequenced index
may fail due to clashings with other indices. This alters the semantics
of the operations provided with respect to their analogues in
<code>std::list</code>.
</li>
<li>Elements in a sequenced index are not mutable, and can only be changed
by means of <a href="#replace"><code>replace</code></a> and
<a href="#modify"><code>modify</code></a> member functions.
</li>
</ul>
Having these restrictions into account, sequenced indices are models
of <a href="http://www.sgi.com/tech/stl/ReversibleContainer.html">
<code>Reversible Container</code></a>,
<a href="http://www.sgi.com/tech/stl/FrontInsertionSequence.html">
<code>Front Insertion Sequence</code></a> and
<a href="http://www.sgi.com/tech/stl/BackInsertionSequence.html">
<code>Back Insertion Sequence</code></a>. 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>
<span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span>
<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined: dependent on types Value, Allocator, TagList</b><span class=special>&gt;</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>node_type</span><span class=special>::</span><span class=identifier>value_type</span> <span class=identifier>value_type</span><span class=special>;</span>
<span class=keyword>typedef</span> <span class=identifier>tuples</span><span class=special>::</span><span class=identifier>null_type</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_type</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_type</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> <span class=identifier>std</span><span class=special>::</span><span class=identifier>size_t</span> <span class=identifier>size_type</span><span class=special>;</span>
<span class=keyword>typedef</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>ptrdiff_t</span> <span class=identifier>difference_type</span><span class=special>;</span>
<span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>allocator_type</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_type</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&lt;iterator&gt;</b> <span class=identifier>reverse_iterator</span><span class=special>;</span>
<span class=keyword>typedef</span> <b>equivalent to
std::reverse_iterator&lt;const_iterator&gt;</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>&amp;</span> <span class=keyword>operator</span><span class=special>=(</span><span class=keyword>const</span> <b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>class</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span>
<span class=keyword>void</span> <span class=identifier>assign</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=keyword>void</span> <span class=identifier>assign</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>value</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>&amp;</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>&amp;</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=keyword>void</span> <span class=identifier>resize</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>=</span><span class=identifier>value_type</span><span class=special>());</span>
<span class=comment>// access:</span>
<span class=identifier>const_reference</span> <span class=identifier>front</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span>
<span class=identifier>const_reference</span> <span class=identifier>back</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>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_front</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>pop_front</span><span class=special>();</span>
<span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_back</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>pop_back</span><span class=special>();</span>
<span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</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>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>void</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=identifier>size_type</span> <span class=identifier>n</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span>
<span class=keyword>void</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=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>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>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>&gt;</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>&lt;</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>&gt;</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>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</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>// list operations:</span>
<span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>i</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span>
<span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</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>void</span> <span class=identifier>remove</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>value</span><span class=special>);</span>
<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Predicate</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>remove_if</span><span class=special>(</span><span class=identifier>Predicate</span> <span class=identifier>pred</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>unique</span><span class=special>();</span>
<span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>class</span> <span class=identifier>BinaryPredicate</span><span class=special>&gt;</span>
<span class=keyword>void</span> <span class=identifier>unique</span><span class=special>(</span><span class=identifier>BinaryPredicate</span> <span class=identifier>binary_pred</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>merge</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
<span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>merge</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=identifier>Compare</span> <span class=identifier>comp</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>sort</span><span class=special>();</span>
<span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>sort</span><span class=special>(</span><span class=identifier>Compare</span> <span class=identifier>comp</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>reverse</span><span class=special>();</span>
<span class=comment>// rearrange operations:</span>
<span class=keyword>void</span> <span class=identifier>relocate</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>i</span><span class=special>);</span>
<span class=keyword>void</span> <span class=identifier>relocate</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</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>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>rearrange</span><span class=special>(</span><span class=identifier>InputIterator</span> <span class=identifier>first</span><span class=special>);</span>
<span class=special>}</span>
<span class=comment>// index comparison:</span>
<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</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>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>()&amp;&amp;</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>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&lt;(</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</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>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&gt;(</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span>
<span class=special>,</span><span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&lt;</span><span class=identifier>x</span><span class=special>;</span>
<span class=special>}</span>
<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&gt;=(</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&lt;</span><span class=identifier>y</span><span class=special>);</span>
<span class=special>}</span>
<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&lt;=(</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
<span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</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>&gt;</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>&lt;</span><b>implementation defined</b><span class=special>&gt;</span>
<span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</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 sequenced indices, we adopt the
scheme outlined in the
<a href="indices.html#complexity_signature">complexity signature
section</a>. The complexity signature of sequenced indices is:
<ul>
<li>copying: <code>c(n)=n*log(n)</code>,</li>
<li>insertion: <code>i(n)=1</code> (constant),</li>
<li>hinted insertion: <code>h(n)=1</code> (constant),</li>
<li>deletion: <code>d(n)=1</code> (constant),</li>
<li>replacement: <code>r(n)=1</code> (constant),</li>
<li>modifying: <code>m(n)=1</code> (constant).</li>
</ul>
</p>
<h4><a name="instantiation_types">Instantiation types</a></h4>
<p>Sequenced 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 the <a href="#sequenced"><code>sequenced</code></a>
index specifier. 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&lt;&gt;</code> is assumed).</li>
</ul>
<code>TagList</code> must be an instantiation of
<a href="indices.html#tag"><code>tag</code></a>.
</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>&amp; operator=(const <b>index class name</b>&amp; 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>
<code>template &lt;class InputIterator><br>
void assign(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>clear</span><span class=special>();</span>
<span class=identifier>insert</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>first</span><span class=special>,</span><span class=identifier>last</span><span class=special>);</span>
</pre></blockquote>
</blockquote>
<code>void assign(size_type n,const value_type&amp; value);</code>
<blockquote>
<b>Effects:</b>
<blockquote><pre>
<span class=identifier>clear</span><span class=special>();</span>
<span class=keyword>for</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>i</span><span class=special>=</span><span class=number>0</span><span class=special>;</span><span class=identifier>i</span><span class=special>&lt;</span><span class=identifier>n</span><span class=special>;++</span><span class=identifier>n</span><span class=special>)</span><span class=identifier>push_back</span><span class=special>(</span><span class=identifier>v</span><span class=special>);</span>
</pre></blockquote>
</blockquote>
<h4><a name="iterators">Iterators</a></h4>
<code>iterator&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iterator_to(const value_type&amp; x);<br>
const_iterator iterator_to(const value_type&amp; 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="capacity">Capacity operations</a></h4>
<code>void resize(size_type n,const value_type&amp; x=value_type());</code>
<blockquote>
<b>Effects:</b>
<blockquote><pre>
<span class=keyword>if</span><span class=special>(</span><span class=identifier>n</span><span class=special>&gt;</span><span class=identifier>size</span><span class=special>())</span><span class=identifier>insert</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>n</span><span class=special>-</span><span class=identifier>size</span><span class=special>(),</span><span class=identifier>x</span><span class=special>);</span>
<span class=keyword>else</span> <span class=keyword>if</span><span class=special>(</span><span class=identifier>n</span><span class=special>&lt;</span><span class=identifier>size</span><span class=special>()){</span>
<span class=identifier>iterator</span> <span class=identifier>it</span><span class=special>=</span><span class=identifier>begin</span><span class=special>();</span>
<span class=identifier>std</span><span class=special>::</span><span class=identifier>advance</span><span class=special>(</span><span class=identifier>it</span><span class=special>,</span><span class=identifier>n</span><span class=special>);</span>
<span class=identifier>erase</span><span class=special>(</span><span class=identifier>it</span><span class=special>,</span><span class=identifier>end</span><span class=special>());</span>
<span class=special>}</span>
</pre></blockquote>
<b>Note:</b> If an expansion is requested, the size of the index is not guaranteed
to be <code>n</code> after this operation (other indices may ban insertions.)
</blockquote>
<h4><a name="modifiers">Modifiers</a></h4>
<code>std::pair&lt;iterator,bool> push_front(const value_type&amp; x);</code>
<blockquote>
<b>Effects:</b> Inserts <code>x</code> at the beginning of the sequence if
no other index of the <code>multi_index_container</code> bans the insertion.<br>
<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.
</blockquote>
<code>std::pair&lt;iterator,bool> push_back(const value_type&amp; x);</code>
<blockquote>
<b>Effects:</b> Inserts <code>x</code> at the end of the sequence if
no other index of the <code>multi_index_container</code> bans the insertion.<br>
<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.
</blockquote>
<code>std::pair&lt;iterator,bool> insert(iterator position,const value_type&amp; x);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.<br>
<b>Effects:</b> Inserts <code>x</code> before <code>position</code> if insertion
is allowed by all other indices of the <code>multi_index_container</code>.<br>
<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.
</blockquote>
<code>void insert(iterator position,size_type n,const value_type&amp; x);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.<br>
<b>Effects:</b>
<blockquote><pre>
<span class=keyword>for</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>i</span><span class=special>=</span><span class=number>0</span><span class=special>;</span><span class=identifier>i</span><span class=special>&lt;</span><span class=identifier>n</span><span class=special>;++</span><span class=identifier>i</span><span class=special>)</span><span class=identifier>insert</span><span class=special>(</span><span class=identifier>position</span><span class=special>,</span><span class=identifier>x</span><span class=special>);</span>
</pre></blockquote>
</blockquote>
<code>template&lt;typename InputIterator><br>
void insert(iterator position,InputIterator first,InputIterator last);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<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=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>insert</span><span class=special>(</span><span class=identifier>position</span><span class=special>,*</span><span class=identifier>first</span><span class=special>++);</span>
</pre></blockquote>
<b>Complexity:</b> <code>O(m*I(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.
</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>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(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&amp; 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 replacing is allowed by all other indices of the
<code>multi_index_container</code>.<br>
<b>Postconditions:</b> Validity of <code>position</code> is preserved
in all cases.<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&lt;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&amp;</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 on sequenced
indices does not change the position of the element with respect to the index;
rearrangement on other indices may or might not succeed. If the rearrangement
fails, the element is erased.<br>
<b>Postconditions:</b> Validity of <code>position</code> is preserved if the
operation succeeds.<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&lt;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&amp;</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 on sequenced
indices does not change the position of the element with respect to the index;
rearrangement on other indices may or might not succeed. 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.<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>
<h4><a name="list_operations">List operations</a></h4>
<p>
Sequenced indices provide the full set of list operations found in
<code>std::list</code>; the semantics of these member functions, however,
differ from that of <code>std::list</code> in some cases as insertions
might not succeed due to banning by other indices. Similarly, the complexity
of the operations may depend on the other indices belonging to the
same <code>multi_index_container</code>.
</p>
<code>void splice(iterator position,<b>index class name</b>&amp; x);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<code>&amp;x!=this</code>.<br>
<b>Effects:</b> Inserts the contents of <code>x</code> before <code>position</code>,
in the same order as they were in <code>x</code>. Those elements succesfully
inserted are erased from <code>x</code>.<br>
<b>Complexity:</b> <code>O(x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
<b>Exception safety:</b> Basic.<br>
</blockquote>
<code>void splice(iterator position,<b>index class name</b>&amp; x,iterator i);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<code>i</code> is a valid dereferenceable iterator <code>x</code>.<br>
<b>Effects:</b> Inserts the element pointed to by <code>i</code> before
<code>position</code>: if insertion is succesful, the element is erased from
<code>x</code>. In the special case <code>&amp;x==this</code>, no copy or
deletion is performed, and the operation is always succesful. If
<code>position==i</code>, no operation is performed.<br>
<b>Postconditions:</b> If <code>&amp;x==this</code>, no iterator or reference
is invalidated.<br>
<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
<code>O(I(n) + D(n))</code>.<br>
<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
otherwise, strong.<br>
</blockquote>
<code>void splice(iterator position,<b>index class name&amp;</b> x,iterator first,iterator last);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<code>first</code> and <code>last</code> are valid iterators of <code>x</code>.
<code>last</code> is reachable from <code>first</code>. <code>position</code>
is not in the range [<code>first</code>,<code>last</code>).<br>
<b>Effects:</b> For each element in the range [<code>first</code>,<code>last</code>),
insertion is tried before <code>position</code>; if the operation is succesful,
the element is erased from <code>x</code>. In the special case
<code>&amp;x==this</code>, no copy or deletion is performed, and insertions are
always succesful.<br>
<b>Postconditions:</b> If <code>&amp;x==this</code>, no iterator or reference
is invalidated.<br>
<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
<code>O(m*I(n+m) + m*D(x.size()))</code> where <code>m</code> is the number
of elements in [<code>first</code>,<code>last</code>).<br>
<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
otherwise, basic.<br>
</blockquote>
<code>void remove(const value_type&amp; value);</code>
<blockquote>
<b>Effects:</b> Erases all elements of the index which compare equal to
<code>value</code>.<br>
<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
is the number of elements erased.<br>
<b>Exception safety:</b> Basic.
</blockquote>
<code>template&lt;typename Predicate> void remove_if(Predicate pred);</code>
<blockquote>
<b>Effects:</b> Erases all elements <code>x</code> of the index for which
<code>pred(x)</code> holds.<br>
<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
is the number of elements erased.<br>
<b>Exception safety:</b> Basic.
</blockquote>
<code>void unique();</code>
<blockquote>
<b>Effects:</b> Eliminates all but the first element from every consecutive
group of equal elements referred to by the iterator <code>i</code> in the range
[<code>first+1</code>,<code>last</code>) for which <code>*i==*(i-1)</code>.<br>
<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
is the number of elements erased.<br>
<b>Exception safety:</b> Basic.
</blockquote>
<code>template &lt;class BinaryPredicate> void unique(BinaryPredicate binary_pred);</code>
<blockquote>
<b>Effects:</b> Eliminates all but the first element from every consecutive
group of elements referred to by the iterator <code>i</code> in the range
[<code>first+1</code>,<code>last</code>) for which
<code>binary_pred(*i,*(i-1))</code> holds.<br>
<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
is the number of elements erased.<br>
<b>Exception safety:</b> Basic.
</blockquote>
<code>void merge(index class name&amp; x);</code>
<blockquote>
<b>Requires:</b> <code>std::less&lt;value_type></code> is a
<a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html">
<code>Strict Weak Ordering</code></a> over <code>value_type</code>.
Both the index and <code>x</code> are sorted according to
<code>std::less&lt;value_type></code>.<br>
<b>Effects:</b> Attempts to insert every element of <code>x</code> into the
corresponding position of the index (according to the order). Elements
successfully inserted are erased from <code>x</code>. The resulting sequence
is stable, i.e. equivalent elements of either container preserve their
relative position. In the special case <code>&amp;x==this</code>, no operation
is performed.<br>
<b>Postconditions:</b> Elements in the index and remaining elements in
<code>x</code> are sorted.
Validity of iterators to the index and of non-erased elements of <code>x</code>
references is preserved.<br>
<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
<code>O(n + x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
otherwise, basic.<br>
</blockquote>
<code>template &lt;typename Compare> void merge(index class name&amp; x,Compare comp);</code>
<blockquote>
<b>Requires:</b> <code>Compare</code> is a
<a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html">
<code>Strict Weak Ordering</code></a> over <code>value_type</code>.
Both the index and <code>x</code> are sorted according to <code>comp</code>.<br>
<b>Effects:</b> Attempts to insert every element of <code>x</code> into the
corresponding position of the index (according to <code>comp</code>).
Elements successfully inserted are erased from <code>x</code>. The resulting
sequence is stable, i.e. equivalent elements of either container preserve
their relative position. In the special case <code>&amp;x==this</code>, no
operation is performed.<br>
<b>Postconditions:</b> Elements in the index and remaining elements in
<code>x</code> are sorted according to <code>comp</code>.
Validity of iterators to the index and of non-erased elements of <code>x</code>
references is preserved.<br>
<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
<code>O(n + x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
otherwise, basic.<br>
</blockquote>
<code>void sort();</code>
<blockquote>
<b>Requires:</b> <code>std::less&lt;value_type></code> is a
<a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html">
<code>Strict Weak Ordering</code></a> over <code>value_type</code>.<br>
<b>Effects:</b> Sorts the index according to
<code>std::less&lt;value_type></code>. The sorting is stable, i.e.
equivalent elements preserve their relative position.<br>
<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
<b>Complexity:</b> <code>O(n*log(n))</code>.<br>
<b>Exception safety:</b> <code>nothrow</code> if
<code>std::less&lt;value_type></code> does not throw; otherwise, basic.
</blockquote>
<code>template &lt;typename Compare> void sort(Compare comp);</code>
<blockquote>
<b>Requires:</b> <code>Compare</code> is a
<a href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html">
<code>Strict Weak Ordering</code></a> over <code>value_type</code>.<br>
<b>Effects:</b> Sorts the index according to <code>comp</code>. The sorting
is stable, i.e. equivalent elements preserve their relative position.<br>
<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
<b>Complexity:</b> <code>O(n*log(n))</code>.<br>
<b>Exception safety:</b> <code>nothrow</code> if <code>comp</code> does
not throw; otherwise, basic.
</blockquote>
<code>void reverse();</code>
<blockquote>
<b>Effects:</b> Reverses the order of the elements in the index.<br>
<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
<b>Complexity:</b> <code>O(n)</code>.<br>
<b>Exception safety:</b> <code>nothrow</code>.
</blockquote>
<h4><a name="rearrange_operations">Rearrange operations</a></h4>
<p>
These operations, without counterpart in <code>std::list</code>
(although <code>splice</code> provides partially overlapping
functionality), perform individual and global repositioning of elements
inside the index.
</p>
<code>void relocate(iterator position,iterator i);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<code>i</code> is a valid dereferenceable iterator of the index.<br>
<b>Effects:</b> Inserts the element pointed to by <code>i</code> before
<code>position</code>. If <code>position==i</code>, no operation is
performed.<br>
<b>Postconditions:</b> No iterator or reference is invalidated.<br>
<b>Complexity:</b> Constant.<br>
<b>Exception safety:</b> <code>nothrow</code>.<br>
</blockquote>
<code>void relocate(iterator position,iterator first,iterator last);</code>
<blockquote>
<b>Requires:</b> <code>position</code> is a valid iterator of the index.
<code>first</code> and <code>last</code> are valid iterators of the index.
<code>last</code> is reachable from <code>first</code>. <code>position</code>
is not in the range [<code>first</code>,<code>last</code>).<br>
<b>Effects:</b> The range of elements [<code>first</code>,<code>last</code>)
is repositioned just before <code>position</code>.<br>
<b>Postconditions:</b> No iterator or reference is invalidated.<br>
<b>Complexity:</b> Constant.<br>
<b>Exception safety:</b> <code>nothrow</code>.<br>
</blockquote>
<a name="rearrange"><code>template&lt;typename InputIterator> void rearrange(InputIterator first);</code></a>
<blockquote>
<b>Requires:</b> The range [<code>first</code>,
<code>std::advance(first,n)</code>),
where <code>n</code> is the size of the index, is a
<a href="indices.html#views">free view</a> of the index.<br>
<b>Effects:</b> The elements are rearranged so as to match the
order of the previously described view.<br>
<b>Postconditions:</b> No iterator or reference is invalidated.<br>
<b>Complexity:</b> <code>O(n)</code>.<br>
<b>Exception safety:</b> Basic.<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 sequenced 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> No additional requirements to those imposed by 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&lt;i&gt;().begin()</code>, <code>m.get&lt;i&gt;().end()</code>),
where <code>i</code> is the position of the sequenced index in the container.
</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>
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<br>
<p>Revised July 21st 2009</p>
<p>&copy; Copyright 2003-2009 Joaqu&iacute;n M L&oacute;pez Mu&ntilde;oz.
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>
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