109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
//
|
|
// traits/execute_free.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
|
|
//
|
|
// Distributed under 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)
|
|
//
|
|
|
|
#ifndef ASIO_TRAITS_EXECUTE_FREE_HPP
|
|
#define ASIO_TRAITS_EXECUTE_FREE_HPP
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
# pragma once
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
|
|
#include "asio/detail/config.hpp"
|
|
#include "asio/detail/type_traits.hpp"
|
|
|
|
#if defined(ASIO_HAS_DECLTYPE) \
|
|
&& defined(ASIO_HAS_NOEXCEPT) \
|
|
&& defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
|
|
# define ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT 1
|
|
#endif // defined(ASIO_HAS_DECLTYPE)
|
|
// && defined(ASIO_HAS_NOEXCEPT)
|
|
// && defined(ASIO_HAS_WORKING_EXPRESSION_SFINAE)
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
namespace traits {
|
|
|
|
template <typename T, typename F, typename = void>
|
|
struct execute_free_default;
|
|
|
|
template <typename T, typename F, typename = void>
|
|
struct execute_free;
|
|
|
|
} // namespace traits
|
|
namespace detail {
|
|
|
|
struct no_execute_free
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = false);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
};
|
|
|
|
#if defined(ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT)
|
|
|
|
template <typename T, typename F, typename = void>
|
|
struct execute_free_trait : no_execute_free
|
|
{
|
|
};
|
|
|
|
template <typename T, typename F>
|
|
struct execute_free_trait<T, F,
|
|
typename void_type<
|
|
decltype(execute(declval<T>(), declval<F>()))
|
|
>::type>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
|
|
using result_type = decltype(
|
|
execute(declval<T>(), declval<F>()));
|
|
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = noexcept(
|
|
execute(declval<T>(), declval<F>())));
|
|
};
|
|
|
|
#else // defined(ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT)
|
|
|
|
template <typename T, typename F, typename = void>
|
|
struct execute_free_trait :
|
|
conditional<
|
|
is_same<T, typename decay<T>::type>::value
|
|
&& is_same<F, typename decay<F>::type>::value,
|
|
no_execute_free,
|
|
traits::execute_free<
|
|
typename decay<T>::type,
|
|
typename decay<F>::type>
|
|
>::type
|
|
{
|
|
};
|
|
|
|
#endif // defined(ASIO_HAS_DEDUCED_EXECUTE_FREE_TRAIT)
|
|
|
|
} // namespace detail
|
|
namespace traits {
|
|
|
|
template <typename T, typename F, typename>
|
|
struct execute_free_default :
|
|
detail::execute_free_trait<T, F>
|
|
{
|
|
};
|
|
|
|
template <typename T, typename F, typename>
|
|
struct execute_free :
|
|
execute_free_default<T, F>
|
|
{
|
|
};
|
|
|
|
} // namespace traits
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_TRAITS_EXECUTE_FREE_HPP
|