mirror of
https://github.com/boostorg/utility.git
synced 2025-11-04 02:11:45 +01:00
100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
// Boost result_of library
|
|
|
|
// Copyright Douglas Gregor 2004. Use, modification and
|
|
// distribution is subject to 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)
|
|
|
|
// For more information, see http://www.boost.org/libs/utility
|
|
#ifndef BOOST_RESULT_OF_HPP
|
|
#define BOOST_RESULT_OF_HPP
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/preprocessor/iteration/iterate.hpp>
|
|
#include <boost/preprocessor/punctuation/comma_if.hpp>
|
|
#include <boost/preprocessor/repetition/enum_params.hpp>
|
|
#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
|
|
#include <boost/detail/workaround.hpp>
|
|
#include <boost/mpl/has_xxx.hpp>
|
|
#include <boost/mpl/if.hpp>
|
|
#include <boost/mpl/bool.hpp>
|
|
#include <boost/mpl/or.hpp>
|
|
#include <boost/type_traits/is_pointer.hpp>
|
|
#include <boost/type_traits/is_member_function_pointer.hpp>
|
|
#include <boost/type_traits/remove_cv.hpp>
|
|
|
|
#ifndef BOOST_RESULT_OF_NUM_ARGS
|
|
# define BOOST_RESULT_OF_NUM_ARGS 10
|
|
#endif
|
|
|
|
namespace boost {
|
|
|
|
template<typename F> struct result_of;
|
|
|
|
#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
|
|
namespace detail {
|
|
|
|
BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
|
|
|
|
template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;
|
|
template<typename F> struct result_of_decltype_impl;
|
|
|
|
template<typename F>
|
|
struct result_of_void_impl
|
|
{
|
|
typedef void type;
|
|
};
|
|
|
|
template<typename R>
|
|
struct result_of_void_impl<R (*)(void)>
|
|
{
|
|
typedef R type;
|
|
};
|
|
|
|
template<typename R>
|
|
struct result_of_void_impl<R (&)(void)>
|
|
{
|
|
typedef R type;
|
|
};
|
|
|
|
// Determine the return type of a function pointer or pointer to member.
|
|
template<typename F, typename FArgs>
|
|
struct result_of_pointer
|
|
: result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
|
|
|
|
template<typename F, typename FArgs>
|
|
struct result_of_impl<F, FArgs, true>
|
|
{
|
|
typedef typename F::result_type type;
|
|
};
|
|
|
|
template<typename FArgs>
|
|
struct is_function_with_no_args : mpl::false_ {};
|
|
|
|
template<typename F>
|
|
struct is_function_with_no_args<F(void)> : mpl::true_ {};
|
|
|
|
template<typename F, typename FArgs>
|
|
struct result_of_nested_result : F::template result<FArgs>
|
|
{};
|
|
|
|
template<typename F, typename FArgs>
|
|
struct result_of_impl<F, FArgs, false>
|
|
: mpl::if_<is_function_with_no_args<FArgs>,
|
|
result_of_void_impl<F>,
|
|
result_of_nested_result<F, FArgs> >::type
|
|
{};
|
|
|
|
} // end namespace detail
|
|
|
|
#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
|
|
#include BOOST_PP_ITERATE()
|
|
|
|
#else
|
|
# define BOOST_NO_RESULT_OF 1
|
|
#endif
|
|
|
|
}
|
|
|
|
#endif // BOOST_RESULT_OF_HPP
|