81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
#pragma once
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namespace std { namespace experimental { inline namespace coroutines_v1 {
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template <typename R, typename...> struct coroutine_traits {
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using promise_type = typename R::promise_type;
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};
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template <typename Promise = void> struct coroutine_handle;
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template <> struct coroutine_handle<void> {
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static coroutine_handle from_address(void *addr) noexcept {
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coroutine_handle me;
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me.ptr = addr;
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return me;
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}
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void operator()() { resume(); }
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void *address() const { return ptr; }
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void resume() const { __builtin_coro_resume(ptr); }
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void destroy() const { __builtin_coro_destroy(ptr); }
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bool done() const { return __builtin_coro_done(ptr); }
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coroutine_handle &operator=(decltype(nullptr)) {
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ptr = nullptr;
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return *this;
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}
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coroutine_handle(decltype(nullptr)) : ptr(nullptr) {}
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coroutine_handle() : ptr(nullptr) {}
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// void reset() { ptr = nullptr; } // add to P0057?
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explicit operator bool() const { return ptr; }
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protected:
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void *ptr;
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};
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template <typename Promise> struct coroutine_handle : coroutine_handle<> {
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using coroutine_handle<>::operator=;
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static coroutine_handle from_address(void *addr) noexcept {
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coroutine_handle me;
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me.ptr = addr;
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return me;
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}
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Promise &promise() const {
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return *reinterpret_cast<Promise *>(
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__builtin_coro_promise(ptr, alignof(Promise), false));
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}
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static coroutine_handle from_promise(Promise &promise) {
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coroutine_handle p;
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p.ptr = __builtin_coro_promise(&promise, alignof(Promise), true);
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return p;
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}
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};
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template <typename _PromiseT>
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bool operator==(coroutine_handle<_PromiseT> const& _Left,
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coroutine_handle<_PromiseT> const& _Right) noexcept
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{
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return _Left.address() == _Right.address();
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}
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template <typename _PromiseT>
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bool operator!=(coroutine_handle<_PromiseT> const& _Left,
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coroutine_handle<_PromiseT> const& _Right) noexcept
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{
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return !(_Left == _Right);
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}
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struct suspend_always {
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bool await_ready() { return false; }
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void await_suspend(coroutine_handle<>) {}
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void await_resume() {}
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};
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struct suspend_never {
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bool await_ready() { return true; }
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void await_suspend(coroutine_handle<>) {}
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void await_resume() {}
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};
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}}}
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