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| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.parse_api.create_parser"></a><a class="link" href="create_parser.html" title="API for Automatic Parser Creation">API |
| for Automatic Parser Creation</a> |
| </h5></div></div></div> |
| <a name="spirit.qi.reference.parse_api.create_parser.description"></a><h6> |
| <a name="id854498"></a> |
| <a class="link" href="create_parser.html#spirit.qi.reference.parse_api.create_parser.description">Description</a> |
| </h6> |
| <p> |
| The library implements a special API returning a parser instance for |
| a supplied attribute type. This function finds the best matching parser |
| type for the attribute based on a set of simple matching rules (as outlined |
| in the table below) applied recursively to the attribute type. The returned |
| parser can be utilized to match input for the provided attribute. |
| </p> |
| <a name="spirit.qi.reference.parse_api.create_parser.header"></a><h6> |
| <a name="id854515"></a> |
| <a class="link" href="create_parser.html#spirit.qi.reference.parse_api.create_parser.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/auto.hpp> |
| </span><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_auto</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. |
| </p> |
| <a name="spirit.qi.reference.parse_api.create_parser.namespace"></a><h6> |
| <a name="id854589"></a> |
| <a class="link" href="create_parser.html#spirit.qi.reference.parse_api.create_parser.namespace">Namespace</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup><col></colgroup> |
| <thead><tr><th> |
| <p> |
| Name |
| </p> |
| </th></tr></thead> |
| <tbody> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">create_parser</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">traits</span><span class="special">::</span><span class="identifier">create_parser_exists</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.parse_api.create_parser.synopsis"></a><h6> |
| <a name="id854709"></a> |
| <a class="link" href="create_parser.html#spirit.qi.reference.parse_api.create_parser.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">qi</span> |
| <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Attr</span><span class="special">></span> |
| <span class="keyword">inline</span> <span class="special"><</span><span class="identifier">unspecified</span><span class="special">></span> |
| <span class="identifier">create_parser</span><span class="special">();</span> |
| <span class="special">}}}</span> |
| </pre> |
| <p> |
| The returned instance can be directly passed as the parser (or the skipping |
| parser) to any of the <span class="emphasis"><em>Spirit.Qi</em></span> API functions. Additionally |
| it can be assigned to a rule as the rules right hand side expression. |
| This function will return a valid parser type only if the meta function |
| <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">create_parser_exists</span></code> returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>. Otherwise it will fail compiling. |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">traits</span> |
| <span class="special">{</span> |
| <span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Attr</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">create_parser_exists</span><span class="special">;</span> |
| <span class="special">}}}</span> |
| </pre> |
| <p> |
| The meta function evaluates to <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code> |
| if <code class="computeroutput"><span class="identifier">create_parser</span></code> would |
| return a valid parser for the given type <code class="computeroutput"><span class="identifier">Attr</span></code>. |
| </p> |
| <p> |
| The following table outlines the mapping rules from the attribute type |
| to the parser type. These rules are applied recursively to create the |
| parser type which can be used to match input for the given attribute |
| type. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Attribute type |
| </p> |
| </th> |
| <th> |
| <p> |
| Generator type |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">char</span></code>, <code class="computeroutput"><span class="keyword">wchar_t</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">standard</span><span class="special">::</span><span class="identifier">char_</span></code>, <code class="computeroutput"><span class="identifier">standard_wide</span><span class="special">::</span><span class="identifier">char_</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">short</span></code>, <code class="computeroutput"><span class="keyword">int</span></code>, <code class="computeroutput"><span class="keyword">long</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">short_</span></code>, <code class="computeroutput"><span class="identifier">int_</span></code>, <code class="computeroutput"><span class="identifier">long_</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">short</span></code>, |
| <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">int</span></code>, |
| <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">long</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ushort_</span></code>, <code class="computeroutput"><span class="identifier">uint_</span></code>, <code class="computeroutput"><span class="identifier">ulong_</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">float</span></code>, <code class="computeroutput"><span class="keyword">double</span></code>, <code class="computeroutput"><span class="keyword">long</span> |
| <span class="keyword">double</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">float_</span></code>, <code class="computeroutput"><span class="identifier">double_</span></code>, <code class="computeroutput"><span class="identifier">long_double</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">short</span></code>, <code class="computeroutput"><span class="keyword">int</span></code>, <code class="computeroutput"><span class="keyword">long</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">short_</span></code>, <code class="computeroutput"><span class="identifier">int_</span></code>, <code class="computeroutput"><span class="identifier">long_</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">long</span> <span class="keyword">long</span></code>, |
| <code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">long</span> |
| <span class="keyword">long</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">long_long</span></code>, |
| <code class="computeroutput"><span class="identifier">ulong_long</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">bool</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">bool_</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Any (STL) container |
| </p> |
| </td> |
| <td> |
| <p> |
| Kleene Star (unary <code class="computeroutput"><span class="char">'*'</span></code>) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Any Fusion sequence |
| </p> |
| </td> |
| <td> |
| <p> |
| Sequence operator (<code class="computeroutput"><span class="char">'<<'</span></code>) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><></span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Optional operator (unary <code class="computeroutput"><span class="char">'-'</span></code>) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">variant</span><span class="special"><></span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Alternative operator (<code class="computeroutput"><span class="char">'|'</span></code>) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="important"><table border="0" summary="Important"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../images/important.png"></td> |
| <th align="left">Important</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The mapping for the parsers <code class="computeroutput"><span class="identifier">long_long</span></code> |
| and <code class="computeroutput"><span class="identifier">ulong_long</span></code> are |
| only available on platforms where the preprocessor constant <code class="computeroutput"><span class="identifier">BOOST_HAS_LONG_LONG</span></code> is defined (i.e. |
| on platforms having native support for <code class="computeroutput"><span class="keyword">long</span> |
| <span class="keyword">long</span></code> and <code class="computeroutput"><span class="keyword">unsigned</span> |
| <span class="keyword">long</span> <span class="keyword">long</span></code> |
| (64 bit) signed and unsigned integer types). |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.qi.reference.parse_api.create_parser.template_parameters"></a><h6> |
| <a name="id857821"></a> |
| <a class="link" href="create_parser.html#spirit.qi.reference.parse_api.create_parser.template_parameters">Template |
| parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Attr</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| An attribute type utilized to create the corresponding parser |
| type from. |
| </p> |
| </td> |
| </tr></tbody> |
| </table></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> |
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