ec117158a3
Now in libcxx and clang, all the coroutine components are defined in std::experimental namespace. And now the coroutine TS is merged into C++20. So in the working draft like N4892, we could find the coroutine components is defined in std namespace instead of std::experimental namespace. And the coroutine support in clang seems to be relatively stable. So I think it may be suitable to move the coroutine component into the experiment namespace now. This patch would make clang lookup coroutine_traits in std namespace first. For the compatibility consideration, clang would lookup in std::experimental namespace if it can't find definitions in std namespace. So the existing codes wouldn't be break after update compiler. And in case the compiler found std::coroutine_traits and std::experimental::coroutine_traits at the same time, it would emit an error for it. The support for looking up std::experimental::coroutine_traits would be removed in Clang16. Reviewed By: lxfind, Quuxplusone Differential Revision: https://reviews.llvm.org/D108696
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
#pragma once
|
|
|
|
namespace std {
|
|
namespace experimental {
|
|
inline namespace coroutines_v1 {
|
|
|
|
template <typename R, typename...> struct coroutine_traits {
|
|
using promise_type = typename R::promise_type;
|
|
};
|
|
|
|
template <typename Promise = void> struct coroutine_handle;
|
|
|
|
template <> struct coroutine_handle<void> {
|
|
static coroutine_handle from_address(void *addr) noexcept {
|
|
coroutine_handle me;
|
|
me.ptr = addr;
|
|
return me;
|
|
}
|
|
void operator()() { resume(); }
|
|
void *address() const noexcept { return ptr; }
|
|
void resume() const { __builtin_coro_resume(ptr); }
|
|
void destroy() const { __builtin_coro_destroy(ptr); }
|
|
bool done() const { return __builtin_coro_done(ptr); }
|
|
coroutine_handle &operator=(decltype(nullptr)) {
|
|
ptr = nullptr;
|
|
return *this;
|
|
}
|
|
coroutine_handle(decltype(nullptr)) : ptr(nullptr) {}
|
|
coroutine_handle() : ptr(nullptr) {}
|
|
// void reset() { ptr = nullptr; } // add to P0057?
|
|
explicit operator bool() const { return ptr; }
|
|
|
|
protected:
|
|
void *ptr;
|
|
};
|
|
|
|
template <typename Promise> struct coroutine_handle : coroutine_handle<> {
|
|
using coroutine_handle<>::operator=;
|
|
|
|
static coroutine_handle from_address(void *addr) noexcept {
|
|
coroutine_handle me;
|
|
me.ptr = addr;
|
|
return me;
|
|
}
|
|
|
|
Promise &promise() const {
|
|
return *reinterpret_cast<Promise *>(
|
|
__builtin_coro_promise(ptr, alignof(Promise), false));
|
|
}
|
|
static coroutine_handle from_promise(Promise &promise) {
|
|
coroutine_handle p;
|
|
p.ptr = __builtin_coro_promise(&promise, alignof(Promise), true);
|
|
return p;
|
|
}
|
|
};
|
|
|
|
template <typename _PromiseT>
|
|
bool operator==(coroutine_handle<_PromiseT> const &_Left,
|
|
coroutine_handle<_PromiseT> const &_Right) noexcept {
|
|
return _Left.address() == _Right.address();
|
|
}
|
|
|
|
template <typename _PromiseT>
|
|
bool operator!=(coroutine_handle<_PromiseT> const &_Left,
|
|
coroutine_handle<_PromiseT> const &_Right) noexcept {
|
|
return !(_Left == _Right);
|
|
}
|
|
|
|
struct suspend_always {
|
|
bool await_ready() { return false; }
|
|
void await_suspend(coroutine_handle<>) {}
|
|
void await_resume() {}
|
|
};
|
|
struct suspend_never {
|
|
bool await_ready() noexcept { return true; }
|
|
void await_suspend(coroutine_handle<>) noexcept {}
|
|
void await_resume() noexcept {}
|
|
};
|
|
|
|
} // namespace coroutines_v1
|
|
} // namespace experimental
|
|
} // namespace std
|