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// This file contains references to sections of the Coroutines TS, which can be
// found at http://wg21.link/coroutines.
// RUN: %clang_cc1 -std=c++20 -verify %s -fcxx-exceptions -fexceptions -Wunused-result
namespace std {
template <class Ret, typename... T>
struct coroutine_traits { using promise_type = typename Ret::promise_type; };
template <class Promise = void>
struct coroutine_handle {
static coroutine_handle from_address(void *);
void *address() const noexcept;
};
template <>
struct coroutine_handle<void> {
template <class PromiseType>
coroutine_handle(coroutine_handle<PromiseType>);
void *address() const noexcept;
};
struct suspend_always {
bool await_ready() { return false; } // expected-note 2 {{must be declared with 'noexcept'}}
void await_suspend(coroutine_handle<>) {} // expected-note 2 {{must be declared with 'noexcept'}}
void await_resume() {} // expected-note 2 {{must be declared with 'noexcept'}}
~suspend_always() noexcept(false); // expected-note 2 {{must be declared with 'noexcept'}}
};
} // namespace std
using namespace std;
struct A {
bool await_ready();
void await_resume();
template <typename F>
void await_suspend(F);
};
struct coro_t {
struct promise_type {
coro_t get_return_object();
suspend_always initial_suspend();
suspend_always final_suspend(); // expected-note 2 {{must be declared with 'noexcept'}}
void return_void();
static void unhandled_exception();
};
};
coro_t f(int n) { // expected-error {{the expression 'co_await __promise.final_suspend()' is required to be non-throwing}}
A a{};
co_await a;
}
template <typename T>
coro_t f_dep(T n) { // expected-error {{the expression 'co_await __promise.final_suspend()' is required to be non-throwing}}
A a{};
co_await a;
}
void foo() {
f_dep<int>(5); // expected-note {{in instantiation of function template specialization 'f_dep<int>' requested here}}
}
struct PositiveFinalSuspend {
bool await_ready() noexcept;
coroutine_handle<> await_suspend(coroutine_handle<>) noexcept;
void await_resume() noexcept;
};
struct correct_coro {
struct promise_type {
correct_coro get_return_object();
suspend_always initial_suspend();
PositiveFinalSuspend final_suspend() noexcept;
void return_void();
static void unhandled_exception();
};
};
correct_coro f2(int n) {
co_return;
}
struct NegativeFinalSuspend {
bool await_ready() noexcept;
coroutine_handle<> await_suspend(coroutine_handle<>) noexcept;
void await_resume() noexcept;
~NegativeFinalSuspend() noexcept(false); // expected-note {{must be declared with 'noexcept'}}
};
struct incorrect_coro {
struct promise_type {
incorrect_coro get_return_object();
suspend_always initial_suspend();
NegativeFinalSuspend final_suspend() noexcept;
void return_void();
static void unhandled_exception();
};
};
incorrect_coro f3(int n) { // expected-error {{the expression 'co_await __promise.final_suspend()' is required to be non-throwing}}
co_return;
}
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