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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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