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//
// Copyright (c) 2022 Klemens Morgenstern (klemens.morgenstern@gmx.net)
//
// 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_COBALT_DETAIL_AWAIT_RESULT_HELPER_HPP
#define BOOST_COBALT_DETAIL_AWAIT_RESULT_HELPER_HPP
#include <boost/cobalt/concepts.hpp>
#include <utility>
namespace boost::cobalt::detail
{
template<awaitable_type T>
auto co_await_result_helper() -> decltype(std::declval<T&>());
template<typename T>
auto co_await_result_helper() -> decltype(std::declval<T>().operator co_await());
template<typename T>
auto co_await_result_helper() -> decltype(operator co_await(std::declval<T>()));
template<typename T>
using co_awaitable_type = decltype(co_await_result_helper<T>());
template<typename T>
using co_await_result_t = decltype(co_await_result_helper<T>().await_resume());
template<awaitable_type T>
T&& get_awaitable_type(T && t) { return std::forward<T>(t);}
template<typename T>
requires (requires (T && t) {{operator co_await(std::forward<T>(t))} -> awaitable_type;} )
decltype(auto) get_awaitable_type(T && t) { return operator co_await(std::forward<T>(t));}
template<typename T>
requires (requires (T && t) {{std::forward<T>(t).operator co_await()} -> awaitable_type;} )
decltype(auto) get_awaitable_type(T && t) { return std::forward<T>(t).operator co_await();}
template<typename T>
struct awaitable_type_getter
{
using type = co_awaitable_type<T&&>;
std::decay_t<T> & ref;
template<typename U>
awaitable_type_getter(U && ref) : ref(ref) {}
operator type ()
{
if constexpr (std::is_lvalue_reference_v<T>)
return get_awaitable_type(ref);
else
return get_awaitable_type(std::move(ref));
}
};
template<awaitable_type T>
struct awaitable_type_getter<T>
{
using type = T&&;
std::decay_t<T> & ref;
template<typename U>
awaitable_type_getter(U && ref) : ref(ref) {}
operator type ()
{
if constexpr (std::is_lvalue_reference_v<T>)
return ref;
else
return std::move(ref);
}
};
}
#endif //BOOST_COBALT_DETAIL_AWAIT_RESULT_HELPER_HPP
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