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<div class="section" id="string">
<h1><a class="toc-backref" href="./classes.html#id1415">string</a></h1>
<div class="section" id="id112">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p><tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> is a <a class="reference internal" href="./variadic-sequence.html">variadic</a>, <a class="reference internal" href="./bidirectional-sequence.html">bidirectional</a>, <a class="reference internal" href="./extensible-sequence.html">extensible</a> <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a> of
characters that supports amortized constant-time insertion and removal of elements at both ends,
and linear-time insertion and removal of elements in the middle. The parameters to <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt>
are multi-character literals, giving a somewhat readable syntax for compile-time strings.
<tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> can also be an argument to the <tt class="literal"><span class="pre"><a href="./c-str.html" class="identifier">c_str</a></span></tt> metafunction, which generates a
null-terminated character array that facilitates interoperability with runtime string
processing routines.</p>
</div>
<div class="section" id="id115">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<table border="1" class="docutils table">
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<col width="26%" />
<col width="74%" />
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<thead valign="bottom">
<tr><th class="head">Sequence form</th>
<th class="head">Header</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Variadic</td>
<td><tt class="literal"><span class="pre">#include &lt;<a href="../../../../boost/mpl/string.hpp" class="header">boost/mpl/string.hpp</a>&gt;</span></tt></td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id116">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<ul class="simple">
<li><a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a></li>
<li><a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a></li>
<li><a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a></li>
<li><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a></li>
<li><a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a></li>
<li><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a></li>
</ul>
</div>
<div class="section" id="id117">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt>, <tt class="literal"><span class="pre">pos</span></tt> and <tt class="literal"><span class="pre">last</span></tt> are iterators
into <tt class="literal"><span class="pre">s</span></tt>, <tt class="literal"><span class="pre">r</span></tt> is a <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> of characters, <tt class="literal"><span class="pre">n</span></tt> and <tt class="literal"><span class="pre">x</span></tt> are <a class="reference internal" href="./integral-constant.html">Integral Constant</a>s,
and <em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub> are arbitrary (multi-)characters.</p>
<table border="1" class="docutils table">
<colgroup>
<col width="40%" />
<col width="60%" />
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<thead valign="bottom">
<tr><th class="head">Expression</th>
<th class="head">Semantics</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><pre class="first last literal-block">
<a href="./string.html" class="identifier">string</a>&lt;<em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub>&gt;
</pre>
</td>
<td><tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of characters <em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub>; see
<a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
</tr>
<tr><td><pre class="first last literal-block">
<a href="./string.html" class="identifier">string</a>&lt;<em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub>&gt;::type
</pre>
</td>
<td>Identical to <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a>&lt;</span></tt><em>c</em><sub>1</sub>,<em>c</em><sub>2</sub>,... <em>c</em><sub>n</sub><tt class="literal"><span class="pre">&gt;</span></tt>;
see <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
<td>An iterator pointing to the beginning of <tt class="literal"><span class="pre">s</span></tt>;
see <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
<td>An iterator pointing to the end of <tt class="literal"><span class="pre">s</span></tt>;
see <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
<td>The size of <tt class="literal"><span class="pre">s</span></tt>; see <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::type</span></tt></td>
<td>A boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
<tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if the sequence is empty;
see <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;s&gt;::type</span></tt></td>
<td>The first element in <tt class="literal"><span class="pre">s</span></tt>; see
<a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./back.html" class="identifier">back</a>&lt;s&gt;::type</span></tt></td>
<td>The last element in <tt class="literal"><span class="pre">s</span></tt>; see
<a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./insert.html" class="identifier">insert</a>&lt;s,pos,x&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre">pos</span></tt>), <tt class="literal"><span class="pre">x</span></tt>,
[<tt class="literal"><span class="pre">pos</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>); see <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./insert-range.html" class="identifier">insert_range</a>&lt;s,pos,r&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre">pos</span></tt>),
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;r&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;r&gt;::type</span></tt>)
[<tt class="literal"><span class="pre">pos</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>); see <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre">pos</span></tt>),
[<tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a>&lt;pos&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>); see
<a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./erase.html" class="identifier">erase</a>&lt;s,pos,last&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre">pos</span></tt>),
[<tt class="literal"><span class="pre">last</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>); see <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type</span></tt></td>
<td>An empty <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt>; see <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./push-back.html" class="identifier">push_back</a>&lt;s,x&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>), <tt class="literal"><span class="pre">x</span></tt>;
see <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./pop-back.html" class="identifier">pop_back</a>&lt;s&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a>&lt;</span> <span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span> <span class="pre">&gt;::type</span></tt>);
see <a class="reference internal" href="./back-extensible-sequence.html">Back Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a>&lt;s,x&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>), <tt class="literal"><span class="pre">x</span></tt>; see <a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./pop-front.html" class="identifier">pop_front</a>&lt;s&gt;::type</span></tt></td>
<td>A new <tt class="literal"><span class="pre"><a href="./string.html" class="identifier">string</a></span></tt> of following elements:
[<tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a>&lt;</span> <span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span> <span class="pre">&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>);
see <a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./c-str.html" class="identifier">c_str</a>&lt;s&gt;::value</span></tt></td>
<td>A null-terminated byte string such that
<tt class="literal"><span class="pre"><a href="./c-str.html" class="identifier">c_str</a>&lt;s&gt;::value[</span></tt><em>n</em><tt class="literal"><span class="pre">]</span></tt> is equal to the <em>n</em>-th
character in <tt class="literal"><span class="pre">s</span></tt>, and
<tt class="literal"><span class="pre"><a href="./c-str.html" class="identifier">c_str</a>&lt;s&gt;::value[<a href="./size.html" class="identifier">size</a>&lt;s&gt;::type::value]</span></tt> is <tt class="literal"><span class="pre">'\0'</span></tt>.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id118">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef mpl::<a href="./string.html" class="identifier">string</a>&lt;'hell','o wo','rld'&gt; hello;
typedef mpl::<a href="./push-back.html" class="identifier">push_back</a>&lt;hello, mpl::<a href="./char.html" class="identifier">char_</a>&lt;'!'&gt; &gt;::type hello2;

BOOST_ASSERT(0 == std::strcmp(mpl::<a href="./c-str.html" class="identifier">c_str</a>&lt;hello2&gt;::value, &quot;hello world!"));
</pre>
</div>
<div class="section" id="id119">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./variadic-sequence.html">Variadic Sequence</a>, <a class="reference internal" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a>, <a class="reference internal" href="./char.html">char_</a>, <a class="reference internal" href="./c-str.html">c_str</a></p>
</div>
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