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<title>Struct template basic_regex</title>
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<div class="refentry">
<a name="boost.xpressive.basic_regex"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template basic_regex</span></h2>
<p>boost::xpressive::basic_regex &#8212; Class template basic_regex&lt;&gt; is a class for holding a compiled regular expression. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../xpressive/reference.html#header.boost.xpressive.basic_regex_hpp" title="Header &lt;boost/xpressive/basic_regex.hpp&gt;">boost/xpressive/basic_regex.hpp</a>&gt;
</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> BidiIter<span class="special">&gt;</span>
<span class="keyword">struct</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a> <span class="special">{</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">BidiIter</span> <a name="boost.xpressive.basic_regex.iterator_type"></a><span class="identifier">iterator_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">iterator_value</span><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a name="boost.xpressive.basic_regex.char_type"></a><span class="identifier">char_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">iterator_value</span><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a name="boost.xpressive.basic_regex.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.xpressive.basic_regex.string_type"></a><span class="identifier">string_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <a name="boost.xpressive.basic_regex.flag_type"></a><span class="identifier">flag_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="basic_regex.html#boost.xpressive.basic_regexconstruct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="basic_regex.html#id1532261-bb"><span class="identifier">basic_regex</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="basic_regex.html#id1532272-bb"><span class="identifier">basic_regex</span></a><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> <a class="link" href="basic_regex.html#id1532323-bb"><span class="identifier">basic_regex</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
basic_regex&amp; <a class="link" href="basic_regex.html#id1532296-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> basic_regex&amp; <a class="link" href="basic_regex.html#id1532357-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="basic_regex.html#id1532195-bb">public member functions</a></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_regex.html#id1532198-bb"><span class="identifier">mark_count</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">regex_id_type</span> <a class="link" href="basic_regex.html#id1532211-bb"><span class="identifier">regex_id</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="basic_regex.html#id1532223-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="basic_regex.html#id1532401-bb">public static functions</a></span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputIter<span class="special">&gt;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a class="link" href="basic_regex.html#id1532404-bb"><span class="identifier">compile</span></a><span class="special">(</span><span class="identifier">InputIter</span><span class="special">,</span> <span class="identifier">InputIter</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputRange<span class="special">&gt;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a class="link" href="basic_regex.html#id1532484-bb"><span class="identifier">compile</span></a><span class="special">(</span><span class="identifier">InputRange</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a class="link" href="basic_regex.html#id1532522-bb"><span class="identifier">compile</span></a><span class="special">(</span><span class="identifier">char_type</span> <span class="keyword">const</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a class="link" href="basic_regex.html#id1532553-bb"><span class="identifier">compile</span></a><span class="special">(</span><span class="identifier">char_type</span> <span class="keyword">const</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">flag_type</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> ECMAScript<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> icase<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> nosubs<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> optimize<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> collate<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> single_line<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> not_dot_null<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> not_dot_newline<span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="keyword">const</span> ignore_white_space<span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id3138114"></a><h2>Description</h2>
<div class="refsect2">
<a name="id3138117"></a><h3>
<a name="boost.xpressive.basic_regexconstruct-copy-destruct"></a><code class="computeroutput">basic_regex</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="id1532261-bb"></a><span class="identifier">basic_regex</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() == 0 </p>
<p>mark_count() == 0 </p>
</td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><a name="id1532272-bb"></a><span class="identifier">basic_regex</span><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span><span class="special">;</span></pre>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
<td><p>The basic_regex object to copy. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() == that.regex_id() </p>
<p>mark_count() == that.mark_count() </p>
</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> <a name="id1532323-bb"></a><span class="identifier">basic_regex</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> expr<span class="special">)</span><span class="special">;</span></pre>
<p>Construct from a static regular expression.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
<td><p>The static regular expression </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>Expr is the type of a static regular expression. </p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() != 0 </p>
<p>mark_count() &gt;= 0 </p>
</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout">basic_regex&amp; <a name="id1532296-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> that<span class="special">)</span><span class="special">;</span></pre>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
<td><p>The basic_regex object to copy. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() == that.regex_id() </p>
<p>mark_count() == that.mark_count() </p>
</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>*this </p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">&gt;</span> basic_regex&amp; <a name="id1532357-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> expr<span class="special">)</span><span class="special">;</span></pre>
<p>Construct from a static regular expression.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">expr</code></span></p></td>
<td><p>The static regular expression. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>Expr is the type of a static regular expression. </p></td>
</tr>
<tr>
<td><p><span class="term">Postconditions:</span></p></td>
<td>
<p>regex_id() != 0 </p>
<p>mark_count() &gt;= 0 </p>
</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>*this </p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>std::bad_alloc </td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3138656"></a><h3>
<a name="id1532195-bb"></a><code class="computeroutput">basic_regex</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="id1532198-bb"></a><span class="identifier">mark_count</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns the count of capturing sub-expressions in this regular expression </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">regex_id_type</span> <a name="id1532211-bb"></a><span class="identifier">regex_id</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Returns a token which uniquely identifies this regular expression. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="id1532223-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="special">&amp;</span> that<span class="special">)</span><span class="special">;</span></pre>
<p>Swaps the contents of this basic_regex object with another.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">that</code></span></p></td>
<td><p>The other basic_regex object. </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>Will not throw.</td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td><p>This is a shallow swap that does not do reference tracking. If you embed a basic_regex object by reference in another regular expression and then swap its contents with another basic_regex object, the change will not be visible to the enclosing regular expression. It is done this way to ensure that swap() cannot throw. </p></td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id3138886"></a><h3>
<a name="id1532401-bb"></a><code class="computeroutput">basic_regex</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputIter<span class="special">&gt;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a name="id1532404-bb"></a><span class="identifier">compile</span><span class="special">(</span><span class="identifier">InputIter</span> begin<span class="special">,</span> <span class="identifier">InputIter</span> end<span class="special">,</span>
<span class="identifier">flag_type</span> flags <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span></pre>
<p>Factory method for building a regex object from a range of characters. Equivalent to regex_compiler&lt; BidiIter &gt;().compile(begin, end, flags);</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><code class="computeroutput">begin</code></span></p></td>
<td><p>The beginning of a range of characters representing the regular expression to compile. </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">end</code></span></p></td>
<td><p>The end of a range of characters representing the regular expression to compile. </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">flags</code></span></p></td>
<td><p>Optional bitmask that determines how the pat string is interpreted. (See syntax_option_type.) </p></td>
</tr>
</tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td>
<p>[begin,end) is a valid range. </p>
<p>The range of characters specified by [begin,end) contains a valid string-based representation of a regular expression. </p>
</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A basic_regex object corresponding to the regular expression represented by the character range. </p></td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>
<a class="link" href="regex_error.html" title="Struct regex_error">regex_error</a> </td>
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</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> InputRange<span class="special">&gt;</span>
<span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a name="id1532484-bb"></a><span class="identifier">compile</span><span class="special">(</span><span class="identifier">InputRange</span> <span class="keyword">const</span> <span class="special">&amp;</span> pat<span class="special">,</span>
<span class="identifier">flag_type</span> flags <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a name="id1532522-bb"></a><span class="identifier">compile</span><span class="special">(</span><span class="identifier">char_type</span> <span class="keyword">const</span> <span class="special">*</span> begin<span class="special">,</span>
<span class="identifier">flag_type</span> flags <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">ECMAScript</span><span class="special">)</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <a class="link" href="basic_regex.html" title="Struct template basic_regex">basic_regex</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span>
<a name="id1532553-bb"></a><span class="identifier">compile</span><span class="special">(</span><span class="identifier">char_type</span> <span class="keyword">const</span> <span class="special">*</span> begin<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> len<span class="special">,</span> <span class="identifier">flag_type</span> flags<span class="special">)</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
</ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2007 Eric Niebler<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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