boost/asio/traits/execute_member.hpp
//
// traits/execute_member.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2024 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 BOOST_ASIO_TRAITS_EXECUTE_MEMBER_HPP
#define BOOST_ASIO_TRAITS_EXECUTE_MEMBER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/type_traits.hpp>
#if defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
# define BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT 1
#endif // defined(BOOST_ASIO_HAS_WORKING_EXPRESSION_SFINAE)
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace traits {
template <typename T, typename F, typename = void>
struct execute_member_default;
template <typename T, typename F, typename = void>
struct execute_member;
} // namespace traits
namespace detail {
struct no_execute_member
{
static constexpr bool is_valid = false;
static constexpr bool is_noexcept = false;
};
#if defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
template <typename T, typename F, typename = void>
struct execute_member_trait : no_execute_member
{
};
template <typename T, typename F>
struct execute_member_trait<T, F,
void_t<
decltype(declval<T>().execute(declval<F>()))
>>
{
static constexpr bool is_valid = true;
using result_type = decltype(
declval<T>().execute(declval<F>()));
static constexpr bool is_noexcept =
noexcept(declval<T>().execute(declval<F>()));
};
#else // defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
template <typename T, typename F, typename = void>
struct execute_member_trait :
conditional_t<
is_same<T, decay_t<T>>::value
&& is_same<F, decay_t<F>>::value,
no_execute_member,
traits::execute_member<
decay_t<T>,
decay_t<F>>
>
{
};
#endif // defined(BOOST_ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
} // namespace detail
namespace traits {
template <typename T, typename F, typename>
struct execute_member_default :
detail::execute_member_trait<T, F>
{
};
template <typename T, typename F, typename>
struct execute_member :
execute_member_default<T, F>
{
};
} // namespace traits
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_TRAITS_EXECUTE_MEMBER_HPP