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Refactor co_generator_t into something a little more comprehensible to me.

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This commit is contained in:
Adrian Conlon 2022-01-02 17:32:05 +00:00
parent 42e72ce077
commit c5ea0c2c21
1 changed files with 43 additions and 28 deletions
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71
inc/co_generator_t.h
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@ -8,53 +8,68 @@
namespace EightBit {
template<typename T>
struct co_generator_t final {
class co_generator_t final {
public:
class promise_type;
struct promise_type;
using handle_type = std::coroutine_handle<promise_type>;
private:
using handle_t = std::coroutine_handle<promise_type>;
struct promise_type {
class promise_type final {
private:
T value_;
std::exception_ptr exception_;
co_generator_t get_return_object() {
return co_generator_t(handle_type::from_promise(*this));
}
std::suspend_always initial_suspend() { return {}; }
std::suspend_always final_suspend() noexcept { return {}; }
void unhandled_exception() { exception_ = std::current_exception(); }
public:
template<std::convertible_to<T> From> // C++20 concept
std::suspend_always yield_value(From&& from) {
[[nodiscard]] constexpr std::suspend_always yield_value(From&& from) noexcept {
value_ = std::forward<From>(from);
return {};
}
void return_void() {}
[[nodiscard]] constexpr std::suspend_always initial_suspend() noexcept { return {}; }
[[nodiscard]] constexpr std::suspend_always final_suspend() noexcept { return {}; }
[[nodiscard]] constexpr co_generator_t get_return_object() noexcept {
return co_generator_t(handle_t::from_promise(*this));
}
constexpr void return_void() {}
constexpr void unhandled_exception() noexcept { exception_ = std::current_exception(); }
[[nodiscard]] constexpr auto& value() noexcept { return value_; };
[[nodiscard]] constexpr auto& exception() noexcept { return exception_; };
};
handle_type h_;
co_generator_t(handle_type h) : h_(h) {}
~co_generator_t() { h_.destroy(); }
explicit operator bool() {
fill();
return !h_.done();
}
T operator()() {
fill();
full_ = false;
return std::move(h_.promise().value_);
}
handle_t h_;
private:
bool full_ = false;
void fill() {
constexpr void fill() {
if (!full_) {
h_();
if (h_.promise().exception_)
std::rethrow_exception(h_.promise().exception_);
if (h_.promise().exception())
std::rethrow_exception(h_.promise().exception());
full_ = true;
}
}
public:
co_generator_t(handle_t h) noexcept : h_(h) {}
~co_generator_t() noexcept { h_.destroy(); }
constexpr explicit operator bool() {
fill();
return !h_.done();
}
[[nodiscard]] constexpr T operator()() {
fill();
full_ = false;
return std::move(h_.promise().value());
}
};
}