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<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2012 Eric Niebler
Distributed under the Boost
Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-->
<header name="boost/proto/context/null.hpp">
<para>
Definintion of
<computeroutput><classname alt="boost::proto::context::null_context">proto::context::null_context<></classname></computeroutput>,
an evaluation context for
<computeroutput><functionname alt="boost::proto::eval">proto::eval()</functionname></computeroutput>
that simply evaluates each child expression, doesn't combine the results at all, and returns void.
</para>
<namespace name="boost">
<namespace name="proto">
<namespace name="context">
<struct name="null_eval">
<template>
<template-type-parameter name="Expr"/>
<template-type-parameter name="Context"/>
</template>
<typedef name="result_type">
<type>void</type>
</typedef>
<method-group name="public member functions">
<method name="operator()" cv="const">
<type>void</type>
<parameter name="expr">
<paramtype>Expr &</paramtype>
</parameter>
<parameter name="context">
<paramtype>Context &</paramtype>
</parameter>
<description>
<para>
For <computeroutput>N</computeroutput> in <computeroutput>[0,Expr arity)</computeroutput>,
evaluate:
<programlisting><functionname>proto::eval</functionname>(<functionname>proto::child_c</functionname><N>(expr), context)</programlisting>
</para>
</description>
</method>
</method-group>
</struct>
<struct name="null_context">
<purpose>An evaluation context for <functionname alt="proto::eval">proto::eval()</functionname> that simply evaluates
each child expression, doesn't combine the results at all, and returns void.</purpose>
<struct name="eval">
<template>
<template-type-parameter name="Expr"/>
<template-type-parameter name="ThisContext">
<default>null_context const</default>
</template-type-parameter>
</template>
<inherit><classname>proto::context::null_eval</classname>< Expr, ThisContext ></inherit>
</struct>
</struct>
</namespace>
</namespace>
</namespace>
</header>
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