boost::proto::context::callable_eval< Expr, Context, 0 > Struct Template Reference

A BinaryFunction that accepts a Proto expression and a callable context and calls the context with the expression tag and children as arguments, effectively fanning the expression out. More...

#include <callable.hpp>

Public Types
typedef proto::result_of::value< Expr const & >::type	value_type
typedef BOOST_PROTO_RESULT_OF < Context(typename Expr::proto_tag, value_type) > ::type	result_type

Public Member Functions
result_type	operator() (Expr &expr, Context &context) const

Detailed Description

template<typename Expr, typename Context>
struct boost::proto::context::callable_eval< Expr, Context, 0 >

A BinaryFunction that accepts a Proto expression and a callable context and calls the context with the expression tag and children as arguments, effectively fanning the expression out.

callable_eval<> requires that Context is a PolymorphicFunctionObject that can be invoked with Expr's tag and children as expressions, as follows:

context(Expr::proto_tag(), value(expr))

Member Typedef Documentation

template<typename Expr , typename Context >

typedef BOOST_PROTO_RESULT_OF< Context(typename Expr::proto_tag, value_type) >::type boost::proto::context::callable_eval< Expr, Context, 0 >::result_type

template<typename Expr , typename Context >

typedef proto::result_of::value<Expr const &>::type boost::proto::context::callable_eval< Expr, Context, 0 >::value_type

Member Function Documentation

template<typename Expr , typename Context >

result_type boost::proto::context::callable_eval< Expr, Context, 0 >::operator() ( Expr &  expr, Context &  context  ) const

inline

Parameters

expr	The current expression
context	The callable evaluation context

Returns

context(Expr::proto_tag(), value(expr))

References boost::phoenix::context(), and boost::proto::value().

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The documentation for this struct was generated from the following file:

• boost_1_57_0/boost/proto/context/callable.hpp