use_awaitable.hpp
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//
// impl/use_awaitable.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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_IMPL_USE_AWAITABLE_HPP
#define ASIO_IMPL_USE_AWAITABLE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/async_result.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Executor, typename T>
class awaitable_handler_base
: public awaitable_thread<Executor>
{
public:
typedef void result_type;
typedef awaitable<T, Executor> awaitable_type;
// Construct from the entry point of a new thread of execution.
awaitable_handler_base(awaitable<void, Executor> a, const Executor& ex)
: awaitable_thread<Executor>(std::move(a), ex)
{
}
// Transfer ownership from another awaitable_thread.
explicit awaitable_handler_base(awaitable_thread<Executor>* h)
: awaitable_thread<Executor>(std::move(*h))
{
}
protected:
awaitable_frame<T, Executor>* frame() noexcept
{
return static_cast<awaitable_frame<T, Executor>*>(this->top_of_stack_);
}
};
template <typename, typename...>
class awaitable_handler;
template <typename Executor>
class awaitable_handler<Executor>
: public awaitable_handler_base<Executor, void>
{
public:
using awaitable_handler_base<Executor, void>::awaitable_handler_base;
void operator()()
{
this->frame()->attach_thread(this);
this->frame()->return_void();
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor>
class awaitable_handler<Executor, asio::error_code>
: public awaitable_handler_base<Executor, void>
{
public:
using awaitable_handler_base<Executor, void>::awaitable_handler_base;
void operator()(const asio::error_code& ec)
{
this->frame()->attach_thread(this);
if (ec)
this->frame()->set_error(ec);
else
this->frame()->return_void();
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor>
class awaitable_handler<Executor, std::exception_ptr>
: public awaitable_handler_base<Executor, void>
{
public:
using awaitable_handler_base<Executor, void>::awaitable_handler_base;
void operator()(std::exception_ptr ex)
{
this->frame()->attach_thread(this);
if (ex)
this->frame()->set_except(ex);
else
this->frame()->return_void();
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename T>
class awaitable_handler<Executor, T>
: public awaitable_handler_base<Executor, T>
{
public:
using awaitable_handler_base<Executor, T>::awaitable_handler_base;
template <typename Arg>
void operator()(Arg&& arg)
{
this->frame()->attach_thread(this);
this->frame()->return_value(std::forward<Arg>(arg));
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename T>
class awaitable_handler<Executor, asio::error_code, T>
: public awaitable_handler_base<Executor, T>
{
public:
using awaitable_handler_base<Executor, T>::awaitable_handler_base;
template <typename Arg>
void operator()(const asio::error_code& ec, Arg&& arg)
{
this->frame()->attach_thread(this);
if (ec)
this->frame()->set_error(ec);
else
this->frame()->return_value(std::forward<Arg>(arg));
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename T>
class awaitable_handler<Executor, std::exception_ptr, T>
: public awaitable_handler_base<Executor, T>
{
public:
using awaitable_handler_base<Executor, T>::awaitable_handler_base;
template <typename Arg>
void operator()(std::exception_ptr ex, Arg&& arg)
{
this->frame()->attach_thread(this);
if (ex)
this->frame()->set_except(ex);
else
this->frame()->return_value(std::forward<Arg>(arg));
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename... Ts>
class awaitable_handler
: public awaitable_handler_base<Executor, std::tuple<Ts...>>
{
public:
using awaitable_handler_base<Executor,
std::tuple<Ts...>>::awaitable_handler_base;
template <typename... Args>
void operator()(Args&&... args)
{
this->frame()->attach_thread(this);
this->frame()->return_values(std::forward<Args>(args)...);
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename... Ts>
class awaitable_handler<Executor, asio::error_code, Ts...>
: public awaitable_handler_base<Executor, std::tuple<Ts...>>
{
public:
using awaitable_handler_base<Executor,
std::tuple<Ts...>>::awaitable_handler_base;
template <typename... Args>
void operator()(const asio::error_code& ec, Args&&... args)
{
this->frame()->attach_thread(this);
if (ec)
this->frame()->set_error(ec);
else
this->frame()->return_values(std::forward<Args>(args)...);
this->frame()->pop_frame();
this->pump();
}
};
template <typename Executor, typename... Ts>
class awaitable_handler<Executor, std::exception_ptr, Ts...>
: public awaitable_handler_base<Executor, std::tuple<Ts...>>
{
public:
using awaitable_handler_base<Executor,
std::tuple<Ts...>>::awaitable_handler_base;
template <typename... Args>
void operator()(std::exception_ptr ex, Args&&... args)
{
this->frame()->attach_thread(this);
if (ex)
this->frame()->set_except(ex);
else
this->frame()->return_values(std::forward<Args>(args)...);
this->frame()->pop_frame();
this->pump();
}
};
} // namespace detail
#if !defined(GENERATING_DOCUMENTATION)
#if defined(_MSC_VER)
template <typename T>
T dummy_return()
{
return std::move(*static_cast<T*>(nullptr));
}
template <>
void dummy_return()
{
}
#endif // defined(_MSC_VER)
template <typename Executor, typename R, typename... Args>
class async_result<use_awaitable_t<Executor>, R(Args...)>
{
public:
typedef typename detail::awaitable_handler<
Executor, typename decay<Args>::type...> handler_type;
typedef typename handler_type::awaitable_type return_type;
template <typename Initiation, typename... InitArgs>
static return_type initiate(Initiation initiation,
use_awaitable_t<Executor> u, InitArgs... args)
{
(void)u;
co_await [&](auto* frame)
{
ASIO_HANDLER_LOCATION((u.file_name_, u.line_, u.function_name_));
handler_type handler(frame->detach_thread());
std::move(initiation)(std::move(handler), std::move(args)...);
return static_cast<handler_type*>(nullptr);
};
for (;;) {} // Never reached.
#if defined(_MSC_VER)
co_return dummy_return<typename return_type::value_type>();
#endif // defined(_MSC_VER)
}
};
#endif // !defined(GENERATING_DOCUMENTATION)
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_IMPL_USE_AWAITABLE_HPP