mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-22 18:25:36 +00:00
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//
|
|
// uses_executor.hpp
|
|
// ~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2019 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_USES_EXECUTOR_HPP
|
|
#define BOOST_ASIO_USES_EXECUTOR_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>
|
|
|
|
#include <boost/asio/detail/push_options.hpp>
|
|
|
|
namespace boost {
|
|
namespace asio {
|
|
|
|
/// A special type, similar to std::nothrow_t, used to disambiguate
|
|
/// constructors that accept executor arguments.
|
|
/**
|
|
* The executor_arg_t struct is an empty structure type used as a unique type
|
|
* to disambiguate constructor and function overloading. Specifically, some
|
|
* types have constructors with executor_arg_t as the first argument,
|
|
* immediately followed by an argument of a type that satisfies the Executor
|
|
* type requirements.
|
|
*/
|
|
struct executor_arg_t
|
|
{
|
|
/// Constructor.
|
|
BOOST_ASIO_CONSTEXPR executor_arg_t() BOOST_ASIO_NOEXCEPT
|
|
{
|
|
}
|
|
};
|
|
|
|
/// A special value, similar to std::nothrow, used to disambiguate constructors
|
|
/// that accept executor arguments.
|
|
/**
|
|
* See boost::asio::executor_arg_t and boost::asio::uses_executor
|
|
* for more information.
|
|
*/
|
|
#if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
|
|
constexpr executor_arg_t executor_arg;
|
|
#elif defined(BOOST_ASIO_MSVC)
|
|
__declspec(selectany) executor_arg_t executor_arg;
|
|
#endif
|
|
|
|
/// The uses_executor trait detects whether a type T has an associated executor
|
|
/// that is convertible from type Executor.
|
|
/**
|
|
* Meets the BinaryTypeTrait requirements. The Asio library provides a
|
|
* definition that is derived from false_type. A program may specialize this
|
|
* template to derive from true_type for a user-defined type T that can be
|
|
* constructed with an executor, where the first argument of a constructor has
|
|
* type executor_arg_t and the second argument is convertible from type
|
|
* Executor.
|
|
*/
|
|
template <typename T, typename Executor>
|
|
struct uses_executor : false_type {};
|
|
|
|
} // namespace asio
|
|
} // namespace boost
|
|
|
|
#include <boost/asio/detail/pop_options.hpp>
|
|
|
|
#endif // BOOST_ASIO_USES_EXECUTOR_HPP
|