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#ifndef INCLUDED_PROMISEBASE_
#define INCLUDED_PROMISEBASE_
//base
#include <cstddef>
#include <future>
#include <coroutine>
template <typename Handler, typename State>
struct PromiseBase
{
Handler get_return_object();
static std::suspend_always initial_suspend();
static std::suspend_always final_suspend() noexcept;
static void unhandled_exception();
static void return_void();
};
template <typename Handler, typename State>
inline void PromiseBase<Handler, State>::return_void()
{}
template <typename Handler, typename State>
inline std::suspend_always PromiseBase<Handler, State>::initial_suspend()
{
return {};
}
template <typename Handler, typename State>
inline std::suspend_always PromiseBase<Handler, State>::final_suspend() noexcept
{
return {};
}
template <typename Handler, typename State>
inline void PromiseBase<Handler, State>::unhandled_exception()
{
std::rethrow_exception(std::current_exception());
}
template <typename Handler, typename State>
inline Handler PromiseBase<Handler, State>::get_return_object()
{
return Handler{ std::coroutine_handle<State>::from_promise(
static_cast<State &>(*this) )
};
}
//=
#endif
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