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Copy pathwhen_all_ready_awaitable.hpp
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258 lines (195 loc) · 5.64 KB
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///////////////////////////////////////////////////////////////////////////////
// Copyright (c) Lewis Baker
// Licenced under MIT license. See LICENSE.txt for details.
///////////////////////////////////////////////////////////////////////////////
#ifndef CPPCORO_DETAIL_WHEN_ALL_READY_AWAITABLE_HPP_INCLUDED
#define CPPCORO_DETAIL_WHEN_ALL_READY_AWAITABLE_HPP_INCLUDED
#include <cppcoro/detail/when_all_counter.hpp>
#include <experimental/coroutine>
#include <tuple>
namespace cppcoro
{
namespace detail
{
template<typename TASK_CONTAINER>
class when_all_ready_awaitable;
template<>
class when_all_ready_awaitable<std::tuple<>>
{
public:
constexpr when_all_ready_awaitable() noexcept {}
explicit constexpr when_all_ready_awaitable(std::tuple<>) noexcept {}
constexpr bool await_ready() const noexcept { return true; }
void await_suspend(std::experimental::coroutine_handle<>) noexcept {}
std::tuple<> await_resume() const noexcept { return {}; }
};
template<typename... TASKS>
class when_all_ready_awaitable<std::tuple<TASKS...>>
{
public:
explicit when_all_ready_awaitable(TASKS&&... tasks)
noexcept(std::conjunction_v<std::is_nothrow_move_constructible<TASKS>...>)
: m_counter(sizeof...(TASKS))
, m_tasks(std::move(tasks)...)
{}
explicit when_all_ready_awaitable(std::tuple<TASKS...>&& tasks)
noexcept(std::is_nothrow_move_constructible_v<std::tuple<TASKS...>>)
: m_counter(sizeof...(TASKS))
, m_tasks(std::move(tasks))
{}
when_all_ready_awaitable(when_all_ready_awaitable&& other) noexcept
: m_counter(sizeof...(TASKS))
, m_tasks(std::move(other.m_tasks))
{}
auto operator co_await() & noexcept
{
struct awaiter
{
awaiter(when_all_ready_awaitable& awaitable) noexcept
: m_awaitable(awaitable)
{}
bool await_ready() const noexcept
{
return m_awaitable.is_ready();
}
bool await_suspend(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
return m_awaitable.try_await(awaitingCoroutine);
}
std::tuple<TASKS...>& await_resume() noexcept
{
return m_awaitable.m_tasks;
}
private:
when_all_ready_awaitable& m_awaitable;
};
return awaiter{ *this };
}
auto operator co_await() && noexcept
{
struct awaiter
{
awaiter(when_all_ready_awaitable& awaitable) noexcept
: m_awaitable(awaitable)
{}
bool await_ready() const noexcept
{
return m_awaitable.is_ready();
}
bool await_suspend(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
return m_awaitable.try_await(awaitingCoroutine);
}
std::tuple<TASKS...>&& await_resume() noexcept
{
return std::move(m_awaitable.m_tasks);
}
private:
when_all_ready_awaitable& m_awaitable;
};
return awaiter{ *this };
}
private:
bool is_ready() const noexcept
{
return m_counter.is_ready();
}
bool try_await(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
start_tasks(std::make_integer_sequence<std::size_t, sizeof...(TASKS)>{});
return m_counter.try_await(awaitingCoroutine);
}
template<std::size_t... INDICES>
void start_tasks(std::integer_sequence<std::size_t, INDICES...>) noexcept
{
(void)std::initializer_list<int>{
(std::get<INDICES>(m_tasks).start(m_counter), 0)...
};
}
when_all_counter m_counter;
std::tuple<TASKS...> m_tasks;
};
template<typename TASK_CONTAINER>
class when_all_ready_awaitable
{
public:
explicit when_all_ready_awaitable(TASK_CONTAINER&& tasks) noexcept
: m_counter(tasks.size())
, m_tasks(std::forward<TASK_CONTAINER>(tasks))
{}
when_all_ready_awaitable(when_all_ready_awaitable&& other)
noexcept(std::is_nothrow_move_constructible_v<TASK_CONTAINER>)
: m_counter(other.m_tasks.size())
, m_tasks(std::move(other.m_tasks))
{}
when_all_ready_awaitable(const when_all_ready_awaitable&) = delete;
when_all_ready_awaitable& operator=(const when_all_ready_awaitable&) = delete;
auto operator co_await() & noexcept
{
class awaiter
{
public:
awaiter(when_all_ready_awaitable& awaitable)
: m_awaitable(awaitable)
{}
bool await_ready() const noexcept
{
return m_awaitable.is_ready();
}
bool await_suspend(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
return m_awaitable.try_await(awaitingCoroutine);
}
TASK_CONTAINER& await_resume() noexcept
{
return m_awaitable.m_tasks;
}
private:
when_all_ready_awaitable& m_awaitable;
};
return awaiter{ *this };
}
auto operator co_await() && noexcept
{
class awaiter
{
public:
awaiter(when_all_ready_awaitable& awaitable)
: m_awaitable(awaitable)
{}
bool await_ready() const noexcept
{
return m_awaitable.is_ready();
}
bool await_suspend(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
return m_awaitable.try_await(awaitingCoroutine);
}
TASK_CONTAINER&& await_resume() noexcept
{
return std::move(m_awaitable.m_tasks);
}
private:
when_all_ready_awaitable& m_awaitable;
};
return awaiter{ *this };
}
private:
bool is_ready() const noexcept
{
return m_counter.is_ready();
}
bool try_await(std::experimental::coroutine_handle<> awaitingCoroutine) noexcept
{
for (auto&& task : m_tasks)
{
task.start(m_counter);
}
return m_counter.try_await(awaitingCoroutine);
}
when_all_counter m_counter;
TASK_CONTAINER m_tasks;
};
}
}
#endif