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<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.qi.reference.parser_concepts.binaryparser"></a><a class="link" href="binaryparser.html" title="BinaryParser">BinaryParser</a>
</h5></div></div></div>
<a name="spirit.qi.reference.parser_concepts.binaryparser.description"></a><h6>
<a name="id884360"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.description">Description</a>
</h6>
<p>
<span class="emphasis"><em>BinaryParser</em></span> is a composite parser that has a two
subjects, <code class="computeroutput"><span class="identifier">left</span></code> and <code class="computeroutput"><span class="identifier">right</span></code>. The BinaryParser allows its
subjects to be treated in the same way as a single instance of a <a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>
following the Composite Design Pattern.
</p>
<a name="spirit.qi.reference.parser_concepts.binaryparser.refinement_of"></a><h6>
<a name="id884411"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.refinement_of">Refinement
of</a>
</h6>
<div class="blockquote"><blockquote class="blockquote"><p>
<a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>
</p></blockquote></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl>
<dt><span class="term"><code class="computeroutput"><span class="identifier">p</span></code></span></dt>
<dd><p>
A BinaryParser.
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">P</span></code></span></dt>
<dd><p>
A BinaryParser type.
</p></dd>
</dl>
</div>
<a name="spirit.qi.reference.parser_concepts.binaryparser.valid_expressions"></a><h6>
<a name="id885110"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.valid_expressions">Valid
Expressions</a>
</h6>
<p>
In addition to the requirements defined in <a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>, for any BinaryParser
the following must be met:
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
<th>
<p>
Return type
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">p</span><span class="special">.</span><span class="identifier">left</span></code>
</p>
</td>
<td>
<p>
Left parser.
</p>
</td>
<td>
<p>
<a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">p</span><span class="special">.</span><span class="identifier">right</span></code>
</p>
</td>
<td>
<p>
Right parser.
</p>
</td>
<td>
<p>
<a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="spirit.qi.reference.parser_concepts.binaryparser.type_expressions"></a><h6>
<a name="id885280"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.type_expressions">Type
Expressions</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">P</span><span class="special">::</span><span class="identifier">left_type</span></code>
</p>
</td>
<td>
<p>
The left parser type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">P</span><span class="special">::</span><span class="identifier">right_type</span></code>
</p>
</td>
<td>
<p>
The right parser type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_binary_parser</span><span class="special"><</span><span class="identifier">P</span><span class="special">>::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
Metafunction that evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
if a certain type, <code class="computeroutput"><span class="identifier">P</span></code>
is a BinaryParser, <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code>
otherwise (See <a href="../../../../../../../../libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Boolean Constant</a>).
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="spirit.qi.reference.parser_concepts.binaryparser.invariants"></a><h6>
<a name="id885484"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.invariants">Invariants</a>
</h6>
<p>
For any BinaryParser, <code class="computeroutput"><span class="identifier">P</span></code>,
the following invariants always hold:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_parser</span><span class="special"><</span><span class="identifier">P</span><span class="special">::</span><span class="identifier">left_type</span><span class="special">>::</span><span class="identifier">type</span></code> evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_parser</span><span class="special"><</span><span class="identifier">P</span><span class="special">::</span><span class="identifier">right_type</span><span class="special">>::</span><span class="identifier">type</span></code> evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
</li>
</ul></div>
<a name="spirit.qi.reference.parser_concepts.binaryparser.models"></a><h6>
<a name="id885631"></a>
<a class="link" href="binaryparser.html#spirit.qi.reference.parser_concepts.binaryparser.models">Models</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../operator/difference.html" title="Difference (a - b)">Difference</a>
</li>
<li class="listitem">
<a class="link" href="../operator/list.html" title="List (a % b)">List</a>
</li>
</ul></div>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<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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