1
2// (C) Copyright Tobias Schwinger
3//
4// Use modification and distribution are subject to the boost Software License,
5// Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt).
6
7//------------------------------------------------------------------------------
8
9#ifndef BOOST_FT_RESULT_TYPE_HPP_INCLUDED
10#define BOOST_FT_RESULT_TYPE_HPP_INCLUDED
11
12#include <boost/blank.hpp>
13#include <boost/mpl/if.hpp>
14
15#include <boost/mpl/aux_/lambda_support.hpp>
16
17#include <boost/mpl/at.hpp>
18
19#include <boost/function_types/is_callable_builtin.hpp>
20#include <boost/function_types/components.hpp>
21
22namespace boost
23{
24 namespace function_types
25 {
26 template< typename T > struct result_type;
27
28 namespace detail
29 {
30 template<typename T> struct result_type_impl
31 : mpl::at_c
32 < typename function_types::components<T>::types, 0 >
33 { };
34 }
35
36 template<typename T> struct result_type
37 : mpl::if_
38 < function_types::is_callable_builtin<T>
39 , detail::result_type_impl<T>, boost::blank
40 >::type
41 {
42 BOOST_MPL_AUX_LAMBDA_SUPPORT(1,result_type,(T))
43 };
44 }
45}
46
47#endif
48
49