<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>UnaryParser</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="primitiveparser.html" title="PrimitiveParser"> <link rel="next" href="binaryparser.html" title="BinaryParser"> </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="primitiveparser.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="binaryparser.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.unaryparser"></a><a class="link" href="unaryparser.html" title="UnaryParser">UnaryParser</a> </h5></div></div></div> <a name="spirit.qi.reference.parser_concepts.unaryparser.description"></a><h6> <a name="id883714"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.description">Description</a> </h6> <p> <span class="emphasis"><em>UnaryParser</em></span> is a composite parser that has a single subject. The UnaryParser may change the behavior of its subject following the Delegate Design Pattern. </p> <a name="spirit.qi.reference.parser_concepts.unaryparser.refinement_of"></a><h6> <a name="id883739"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.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 UnaryParser. </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">P</span></code></span></dt> <dd><p> A UnaryParser type. </p></dd> </dl> </div> <a name="spirit.qi.reference.parser_concepts.unaryparser.valid_expressions"></a><h6> <a name="id883817"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.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 UnaryParser 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">subject</span></code> </p> </td> <td> <p> Subject 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.unaryparser.type_expressions"></a><h6> <a name="id883937"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.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">subject_type</span></code> </p> </td> <td> <p> The subject parser type. </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_unary_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 UnaryParser, <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.unaryparser.invariants"></a><h6> <a name="id884109"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.invariants">Invariants</a> </h6> <p> For any UnaryParser, <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">P</span><span class="special">::</span><span class="identifier">subject_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.unaryparser.models"></a><h6> <a name="id884198"></a> <a class="link" href="unaryparser.html#spirit.qi.reference.parser_concepts.unaryparser.models">Models</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <a class="link" href="../operator/and_predicate.html" title="And-Predicate (&a)">And Predicate</a> </li> <li class="listitem"> <a class="link" href="../operator/kleene.html" title="Kleene (*a)">Kleene</a> </li> <li class="listitem"> <a class="link" href="../directive/lexeme.html" title="Inhibiting Skipping (lexeme[])"><code class="computeroutput"><span class="identifier">lexeme</span></code></a> </li> <li class="listitem"> <a class="link" href="../operator/not_predicate.html" title="Not-Predicate (!a)">Not Predicate</a> </li> <li class="listitem"> <a class="link" href="../directive/omit.html" title="Ignoring Attribute (omit[])"><code class="computeroutput"><span class="identifier">omit</span></code></a> </li> <li class="listitem"> <a class="link" href="../operator/plus.html" title="Plus (+a)">Plus</a> </li> <li class="listitem"> <a class="link" href="../directive/raw.html" title="Transduction Parsing (raw[])"><code class="computeroutput"><span class="identifier">raw</span></code></a> </li> <li class="listitem"> <a class="link" href="../directive/repeat.html" title="Repetition (repeat[])"><code class="computeroutput"><span class="identifier">repeat</span></code></a> </li> <li class="listitem"> <a class="link" href="../directive/skip.html" title="Re-Establish Skipping (skip[])"><code class="computeroutput"><span class="identifier">skip</span></code></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="primitiveparser.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="binaryparser.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>