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261 lines (199 loc) · 6.63 KB
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export module mcpplibs.cmp:task;
import std;
export namespace mcpplibs::cmp {
// 完成时对称转移到等待方，避免嵌套 Task 持续增长原生调用栈
template<typename T = void>
requires (
std::same_as<T, void> ||
(std::is_object_v<T> && !std::is_array_v<T>)
)
class [[nodiscard]] Task {
public:
struct promise_type {
std::optional<T> result_ {};
std::exception_ptr exception_ {};
std::coroutine_handle<> continuation_ { std::noop_coroutine() };
[[nodiscard]] Task get_return_object() noexcept;
[[nodiscard]] constexpr std::suspend_always initial_suspend() const noexcept {
return {};
}
class FinalAwaiter {
public:
[[nodiscard]] constexpr bool await_ready() const noexcept {
return false;
}
[[nodiscard]] std::coroutine_handle<> await_suspend(
std::coroutine_handle<promise_type> coroutine) const noexcept {
return coroutine.promise().continuation_;
}
constexpr void await_resume() const noexcept {}
};
[[nodiscard]] constexpr FinalAwaiter final_suspend() const noexcept {
return {};
}
template<typename U>
requires std::constructible_from<T, U&&>
void return_value(U&& value)
noexcept(std::is_nothrow_constructible_v<T, U&&>) {
result_.emplace(std::forward<U>(value));
}
void unhandled_exception() noexcept {
exception_ = std::current_exception();
}
};
private:
using Handle = std::coroutine_handle<promise_type>;
class Awaiter {
private:
Handle coroutine_ {};
public:
explicit Awaiter(Handle coroutine) noexcept
: coroutine_ { coroutine } {}
Awaiter(const Awaiter&) = delete;
Awaiter& operator=(const Awaiter&) = delete;
Awaiter(Awaiter&& other) noexcept
: coroutine_ { std::exchange(other.coroutine_, {}) } {}
Awaiter& operator=(Awaiter&&) = delete;
~Awaiter() {
if (coroutine_) {
coroutine_.destroy();
}
}
[[nodiscard]] constexpr bool await_ready() const noexcept {
return false;
}
[[nodiscard]] std::coroutine_handle<> await_suspend(
std::coroutine_handle<> continuation) noexcept {
coroutine_.promise().continuation_ = continuation;
return coroutine_;
}
T await_resume() {
auto& promise = coroutine_.promise();
if (promise.exception_) {
std::rethrow_exception(promise.exception_);
}
return std::move(*promise.result_);
}
};
Handle coroutine_ {};
explicit Task(Handle coroutine) noexcept
: coroutine_ { coroutine } {}
public:
Task() = delete;
Task(const Task&) = delete;
Task& operator=(const Task&) = delete;
Task(Task&& other) noexcept
: coroutine_ { std::exchange(other.coroutine_, {}) } {}
Task& operator=(Task&&) = delete;
~Task() {
if (coroutine_) {
coroutine_.destroy();
}
}
[[nodiscard]] auto operator co_await() && noexcept {
if (!coroutine_) {
std::terminate();
}
return Awaiter { std::exchange(coroutine_, {}) };
}
};
template<typename T>
requires (
std::same_as<T, void> ||
(std::is_object_v<T> && !std::is_array_v<T>)
)
Task<T> Task<T>::promise_type::get_return_object() noexcept {
return Task {
std::coroutine_handle<promise_type>::from_promise(*this)
};
}
template<>
class [[nodiscard]] Task<void> {
public:
struct promise_type {
std::exception_ptr exception_ {};
std::coroutine_handle<> continuation_ { std::noop_coroutine() };
[[nodiscard]] Task get_return_object() noexcept;
[[nodiscard]] constexpr std::suspend_always initial_suspend() const noexcept {
return {};
}
class FinalAwaiter {
public:
[[nodiscard]] constexpr bool await_ready() const noexcept {
return false;
}
[[nodiscard]] std::coroutine_handle<> await_suspend(
std::coroutine_handle<promise_type> coroutine) const noexcept {
return coroutine.promise().continuation_;
}
constexpr void await_resume() const noexcept {}
};
[[nodiscard]] constexpr FinalAwaiter final_suspend() const noexcept {
return {};
}
constexpr void return_void() const noexcept {}
void unhandled_exception() noexcept {
exception_ = std::current_exception();
}
};
private:
using Handle = std::coroutine_handle<promise_type>;
class Awaiter {
private:
Handle coroutine_ {};
public:
explicit Awaiter(Handle coroutine) noexcept
: coroutine_ { coroutine } {}
Awaiter(const Awaiter&) = delete;
Awaiter& operator=(const Awaiter&) = delete;
Awaiter(Awaiter&& other) noexcept
: coroutine_ { std::exchange(other.coroutine_, {}) } {}
Awaiter& operator=(Awaiter&&) = delete;
~Awaiter() {
if (coroutine_) {
coroutine_.destroy();
}
}
[[nodiscard]] constexpr bool await_ready() const noexcept {
return false;
}
[[nodiscard]] std::coroutine_handle<> await_suspend(
std::coroutine_handle<> continuation) noexcept {
coroutine_.promise().continuation_ = continuation;
return coroutine_;
}
void await_resume() {
auto& promise = coroutine_.promise();
if (promise.exception_) {
std::rethrow_exception(promise.exception_);
}
}
};
Handle coroutine_ {};
explicit Task(Handle coroutine) noexcept
: coroutine_ { coroutine } {}
public:
Task() = delete;
Task(const Task&) = delete;
Task& operator=(const Task&) = delete;
Task(Task&& other) noexcept
: coroutine_ { std::exchange(other.coroutine_, {}) } {}
Task& operator=(Task&&) = delete;
~Task() {
if (coroutine_) {
coroutine_.destroy();
}
}
[[nodiscard]] auto operator co_await() && noexcept {
if (!coroutine_) {
std::terminate();
}
return Awaiter { std::exchange(coroutine_, {}) };
}
};
inline Task<void> Task<void>::promise_type::get_return_object() noexcept {
return Task {
std::coroutine_handle<promise_type>::from_promise(*this)
};
}
} // namespace mcpplibs::cmp