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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./push-back.html" class="navigation-link">push_back</a></td>
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<div class="section" id="push-back">
<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1443">push_back</a></h1>
<div class="section" id="id336">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename Sequence
    , typename T
    &gt;
struct <a href="./push-back.html" class="identifier">push_back</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
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<div class="section" id="id337">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p><tt class="literal"><span class="pre"><a href="./push-back.html" class="identifier">push_back</a></span></tt> performs an insertion at the end of the sequence with guaranteed <em>O(1)</em>
complexity.</p>
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<div class="section" id="id338">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/push_back.hpp" class="header">boost/mpl/push_back.hpp</a>&gt;
</pre>
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<div class="section" id="id339">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
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</thead>
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<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
<td><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></td>
<td>A sequence to insert into.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">T</span></tt></td>
<td>Any type</td>
<td>The element to be inserted.</td>
</tr>
</tbody>
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<div class="section" id="id341">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt> and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./push-back.html" class="identifier">push_back</a>&lt;s,x&gt;::type r;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="literal-block">
typedef <a href="./insert.html" class="identifier">insert</a>&lt; s,<a href="./end.html" class="identifier">end</a>&lt;s&gt;::type,x &gt;::type r;
</pre>
</td>
</tr>
<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;r&gt;::type</span></tt> is identical to <tt class="literal"><span class="pre">x</span></tt>;</p>
<pre class="last literal-block">
<a href="./size.html" class="identifier">size</a>&lt;r&gt;::value == <a href="./size.html" class="identifier">size</a>&lt;s&gt;::value + 1
</pre>
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<div class="section" id="id342">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
</div>
<div class="section" id="id343">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;bool,false,false,false,
    true,true,true,false,false&gt; bools;

typedef <a href="./push-back.html" class="identifier">push_back</a>&lt;bools,<a href="./bool.html" class="identifier">false_</a>&gt;::type message;

<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./back.html" class="identifier">back</a>&lt;message&gt;::type::value, ==, false );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>(
      ( <a href="./count-if.html" class="identifier">count_if</a>&lt;message, <a href="./equal-to.html" class="identifier">equal_to</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>,<a href="./bool.html" class="identifier">false_</a>&gt; &gt;::value ), ==, 6
    );
</pre>
</div>
<div class="section" id="id344">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>, <a class="reference internal" href="./insert.html">insert</a>, <a class="reference internal" href="./pop-back.html">pop_back</a>, <a class="reference internal" href="./back.html">back</a>, <a class="reference internal" href="./push-front.html">push_front</a></p>
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