| <?xml version="1.0" encoding="utf-8"?> |
| <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> |