forked from OSchip/llvm-project
72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin9 %s -std=c++20 -fcoroutines-ts -fsyntax-only -Wignored-qualifiers -Wno-error=return-type -verify -fblocks -Wno-unreachable-code -Wno-unused-value
|
|
#ifndef STD_COROUTINE_H
|
|
#define STD_COROUTINE_H
|
|
|
|
namespace std {
|
|
|
|
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;
|
|
}
|
|
};
|
|
|
|
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 std
|
|
|
|
#endif // STD_COROUTINE_H
|