// (C) Copyright Tobias Schwinger | |
// | |
// Use modification and distribution are subject to the boost Software License, | |
// Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt). | |
//------------------------------------------------------------------------------ | |
#ifndef BOOST_FT_RESULT_TYPE_HPP_INCLUDED | |
#define BOOST_FT_RESULT_TYPE_HPP_INCLUDED | |
#include <boost/blank.hpp> | |
#include <boost/mpl/if.hpp> | |
#include <boost/mpl/aux_/lambda_support.hpp> | |
#include <boost/type_traits/detail/template_arity_spec.hpp> | |
#include <boost/mpl/at.hpp> | |
#include <boost/function_types/is_callable_builtin.hpp> | |
#include <boost/function_types/components.hpp> | |
namespace boost | |
{ | |
namespace function_types | |
{ | |
template< typename T > struct result_type; | |
namespace detail | |
{ | |
template<typename T> struct result_type_impl | |
: mpl::at_c | |
< typename function_types::components<T>::types, 0 > | |
{ }; | |
} | |
template<typename T> struct result_type | |
: mpl::if_ | |
< function_types::is_callable_builtin<T> | |
, detail::result_type_impl<T>, boost::blank | |
>::type | |
{ | |
BOOST_MPL_AUX_LAMBDA_SUPPORT(1,result_type,(T)) | |
}; | |
} | |
BOOST_TT_AUX_TEMPLATE_ARITY_SPEC(1,function_types::result_type) | |
} | |
#endif | |