<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Function template assert_matches</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../proto/reference.html#header.boost.proto.debug_hpp" title="Header <boost/proto/debug.hpp>"> <link rel="prev" href="display__idm45506996767344.html" title="Function display_expr"> <link rel="next" href="assert_matches_not.html" title="Function template assert_matches_not"> </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="display__idm45506996767344.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.debug_hpp"><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="assert_matches_not.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="refentry"> <a name="boost.proto.assert_matches"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Function template assert_matches</span></h2> <p>boost::proto::assert_matches — Assert at compile time that a particular expression matches the specified grammar. </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: <<a class="link" href="../../proto/reference.html#header.boost.proto.debug_hpp" title="Header <boost/proto/debug.hpp>">boost/proto/debug.hpp</a>> </span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Grammar<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">void</span> <span class="identifier">assert_matches</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555192716176"></a><h2>Description</h2> <p> Use <code class="computeroutput">proto::assert_matches()</code> to assert at compile-time that an expression matches a grammar. </p> <p> <span class="bold"><strong>Example:</strong></span></p> <pre class="programlisting">typedef proto::plus< proto::terminal< int >, proto::terminal< int > > PlusInts; proto::assert_matches<PlusInts>( <code class="computeroutput"><a class="link" href="lit.html" title="Function lit">proto::lit</a></code>(1) + 42 );</pre> <p> </p> <p> See also: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><code class="computeroutput"><a class="link" href="assert_matches_not.html" title="Function template assert_matches_not">proto::assert_matches_not</a>()</code></li> <li class="listitem"><code class="computeroutput"><a class="link" href="../../BOOST_PROTO_ASSERT_MATCHES.html" title="Macro BOOST_PROTO_ASSERT_MATCHES">BOOST_PROTO_ASSERT_MATCHES</a>()</code></li> <li class="listitem"><code class="computeroutput"><a class="link" href="../../BOOST_PROTO_ASSERT_MATCHES_NOT.html" title="Macro BOOST_PROTO_ASSERT_MATCHES_NOT">BOOST_PROTO_ASSERT_MATCHES_NOT</a>()</code></li> </ul></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Notes:</span></p></td> <td><p> Equivalent to <code class="computeroutput">BOOST_MPL_ASSERT((<a class="link" href="matches.html" title="Struct template matches">proto::matches</a><Expr, Grammar>))</code>. </p></td> </tr></tbody> </table></div> </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 © 2008 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="display__idm45506996767344.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.debug_hpp"><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="assert_matches_not.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>