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//
// packaged_task.hpp
// ~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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_PACKAGED_TASK_HPP
#define ASIO_PACKAGED_TASK_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if defined(ASIO_HAS_STD_FUTURE) \
|| defined(GENERATING_DOCUMENTATION)
#include <future>
#include "asio/async_result.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/detail/variadic_templates.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
#if defined(ASIO_HAS_VARIADIC_TEMPLATES) \
|| defined(GENERATING_DOCUMENTATION)
/// Partial specialisation of @c async_result for @c std::packaged_task.
template <typename Result, typename... Args, typename Signature>
class async_result<std::packaged_task<Result(Args...)>, Signature>
{
public:
/// The packaged task is the concrete completion handler type.
typedef std::packaged_task<Result(Args...)> completion_handler_type;
/// The return type of the initiating function is the future obtained from
/// the packaged task.
typedef std::future<Result> return_type;
/// The constructor extracts the future from the packaged task.
explicit async_result(completion_handler_type& h)
: future_(h.get_future())
{
}
/// Returns the packaged task's future.
return_type get()
{
return std::move(future_);
}
private:
return_type future_;
};
#else // defined(ASIO_HAS_VARIADIC_TEMPLATES)
// || defined(GENERATING_DOCUMENTATION)
template <typename Result, typename Signature>
struct async_result<std::packaged_task<Result()>, Signature>
{
typedef std::packaged_task<Result()> completion_handler_type;
typedef std::future<Result> return_type;
explicit async_result(completion_handler_type& h)
: future_(h.get_future())
{
}
return_type get()
{
return std::move(future_);
}
private:
return_type future_;
};
#define ASIO_PRIVATE_ASYNC_RESULT_DEF(n) \
template <typename Result, \
ASIO_VARIADIC_TPARAMS(n), typename Signature> \
class async_result< \
std::packaged_task<Result(ASIO_VARIADIC_TARGS(n))>, Signature> \
{ \
public: \
typedef std::packaged_task< \
Result(ASIO_VARIADIC_TARGS(n))> \
completion_handler_type; \
\
typedef std::future<Result> return_type; \
\
explicit async_result(completion_handler_type& h) \
: future_(h.get_future()) \
{ \
} \
\
return_type get() \
{ \
return std::move(future_); \
} \
\
private: \
return_type future_; \
}; \
/**/
ASIO_VARIADIC_GENERATE(ASIO_PRIVATE_ASYNC_RESULT_DEF)
#undef ASIO_PRIVATE_ASYNC_RESULT_DEF
#endif // defined(ASIO_HAS_VARIADIC_TEMPLATES)
// || defined(GENERATING_DOCUMENTATION)
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_STD_FUTURE)
// || defined(GENERATING_DOCUMENTATION)
#endif // ASIO_PACKAGED_TASK_HPP
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