<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>NaryParser</title>
<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.0">
<link rel="home" href="../../../../index.html" title="Spirit 2.4">
<link rel="up" href="../parser_concepts.html" title="Parser Concepts">
<link rel="prev" href="binaryparser.html" title="BinaryParser">
<link rel="next" href="nonterminal.html" title="Nonterminal">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.html">Home</a></td>
<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td>
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="binaryparser.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../parser_concepts.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="nonterminal.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.qi.reference.parser_concepts.naryparser"></a><a class="link" href="naryparser.html" title="NaryParser">NaryParser</a>
</h5></div></div></div>
<a name="spirit.qi.reference.parser_concepts.naryparser.description"></a><h6>
<a name="id885685"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.description">Description</a>
</h6>
<p>
<span class="emphasis"><em>NaryParser</em></span> is a composite parser that has one or
more subjects. The NaryParser 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.naryparser.refinement_of"></a><h6>
<a name="id885721"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.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 NaryParser.
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">P</span></code></span></dt>
<dd><p>
A NaryParser type.
</p></dd>
</dl>
</div>
<a name="spirit.qi.reference.parser_concepts.naryparser.valid_expressions"></a><h6>
<a name="id885799"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.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 NaryParser 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">elements</span></code>
</p>
</td>
<td>
<p>
The tuple of elements.
</p>
</td>
<td>
<p>
A <a href="../../../../../../../../libs/fusion/doc/html/index.html" target="_top">Boost.Fusion</a>
Sequence of <a class="link" href="parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a> types.
</p>
</td>
</tr></tbody>
</table></div>
<a name="spirit.qi.reference.parser_concepts.naryparser.type_expressions"></a><h6>
<a name="id885925"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.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">elements_type</span></code>
</p>
</td>
<td>
<p>
Elements tuple type.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_nary_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 NaryParser, <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.naryparser.invariants"></a><h6>
<a name="id886099"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.invariants">Invariants</a>
</h6>
<p>
For each element, <code class="computeroutput"><span class="identifier">E</span></code>,
in any NaryParser, <code class="computeroutput"><span class="identifier">P</span></code>,
the following invariant always holds:
</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">E</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.naryparser.models"></a><h6>
<a name="id886188"></a>
<a class="link" href="naryparser.html#spirit.qi.reference.parser_concepts.naryparser.models">Models</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
<a class="link" href="../operator/alternative.html" title="Alternative (a | b)">Alternative</a>
</li>
<li class="listitem">
<a class="link" href="../operator/expect.html" title="Expectation (a > b)">Expect</a>
</li>
<li class="listitem">
<a class="link" href="../operator/permutation.html" title="Permutation (a ^ b)">Permutation</a>
</li>
<li class="listitem">
<a class="link" href="../operator/sequence.html" title="Sequence (a >> b)">Sequence</a>
</li>
<li class="listitem">
<a class="link" href="../operator/sequential_or.html" title="Sequential Or (a || b)">Sequential
Or</a>
</li>
</ul></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<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>)
</p>
</div></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="binaryparser.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../parser_concepts.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="nonterminal.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>
