\n/// Yield\n///

\nstruct Yield\n{\n constexpr Yield() :\n count(1)\n {}\n\n constexpr Yield(std::uint32_t _count) :\n count(_count)\n {}\n\n std::uint32_t count;\n};\n\nnamespace detail\n{\n struct YieldAwaiter : IAwaiter\n {\n YieldAwaiter(const Yield& y):\n yield(y)\n {}\n bool await_ready() const noexcept\n {\n return yield.count == 0;\n }\n\n template\n void await_suspend(Handle handle)\n {\n handle.promise().pAwaiter = this;\n }\n void await_resume() {}\n\n bool resume() override\n {\n return --yield.count > 0;\n }\n Yield yield;\n };\n}\n\n///

\n/// operator co_await\n///

\n/// \n/// \ninline auto operator co_await(const Yield& yield)\n{\n return detail::YieldAwaiter{ yield };\n}\nnamespace detail\n{\n template\n struct PromiseType;\n}\n\n///

\n/// Fiber\n///

\ntemplate \nstruct Fiber\n{\n using promise_type = detail::PromiseType;\n using Handle = std::coroutine_handle;\npublic:\n Fiber(Handle h);\n\n Fiber(Fiber const&) = delete;\n\n Fiber(Fiber&& rhs) noexcept;\n\n ~Fiber();\npublic:\n ///

\n /// 再開\n ///

\n /// \n bool resume() const;\n\n ///

\n /// 完了したか\n ///

\n /// \n [[nodiscard]] bool isDone() const;\n\n ///

\n /// 取得\n ///

\n /// \n [[nodiscard]] decltype(auto) get() const;\n\nprivate:\n Handle m_coro;\n};\n\n///

\n/// operator co_await\n///

\n/// \n/// \n/// \ntemplate\nauto operator co_await(Fiber other);\n\n///

\n/// 両辺のFiberの完了を待つFiberを生成\n///

\n/// \n/// \n/// \n/// \n/// \ntemplate\n[[nodiscard]] Fiber operator & (Fiber a, Fiber b);\n\n///

\n/// 両辺のいずれかのFiberの完了を待つFiberを生成\n///

\n/// \n/// \n/// \n/// \n/// \ntemplate\n[[nodiscard]] Fiber operator | (Fiber a, Fiber b);\n\n///

\n/// 左辺のFiberの完了を待ったあと右辺のFiberを待つ\n///

\n/// \n/// \n/// \n/// \n/// \ntemplate\n[[nodiscard]] Fiber operator + (Fiber a, Fiber b);\n\ntemplate \ninline Fiber::Fiber(Handle h) :\n m_coro(h)\n{}\n\ntemplate \ninline Fiber::Fiber(Fiber&& rhs) noexcept\n : m_coro(std::move(rhs.m_coro))\n{\n rhs.m_coro = nullptr;\n}\ntemplate \ninline Fiber::~Fiber()\n{\n if (m_coro) {\n m_coro.destroy();\n }\n}\n\ntemplate \ninline bool Fiber::resume() const\n{\n if (!m_coro) {\n return false;\n }\n if (m_coro.done()) {\n return false;\n }\n // Yield\n {\n if (auto& pAwaiter = m_coro.promise().pAwaiter) {\n if (!pAwaiter->resume()) {\n pAwaiter = nullptr;\n } else {\n return true;\n }\n }\n }\n m_coro.resume();\n return !m_coro.done();\n}\n\ntemplate \ninline bool Fiber::isDone() const\n{\n if (!m_coro) {\n return true;\n }\n return m_coro.done();\n}\n\ntemplate \ninline decltype(auto) Fiber::get() const\n{\n return m_coro.promise().getValue();\n}\n\ntemplate\ninline Fiber operator & (Fiber a, Fiber b)\n{\n while (true) {\n a.resume();\n b.resume();\n\n if (a.isDone() && b.isDone()) {\n co_return;\n }\n\n co_yield{};\n }\n}\n\ntemplate\ninline Fiber operator | (Fiber a, Fiber b)\n{\n while (true) {\n a.resume();\n if (a.isDone()) {\n co_return;\n }\n b.resume();\n if (b.isDone()) {\n co_return;\n }\n\n co_yield{};\n }\n}\n\ntemplate\ninline Fiber operator + (Fiber a, Fiber b)\n{\n while (a.resume()) {\n co_yield{};\n }\n while (b.resume()) {\n co_yield{};\n }\n co_return b.get();\n}\nnamespace detail {\n template\n struct FiberAwaiter;\n}\n\ntemplate\ninline auto operator co_await(Fiber other)\n{\n return detail::FiberAwaiter{ std::move(other) };\n}\n\nnamespace detail\n{\n ///

\n /// Promise\n ///

\n template\n struct PromiseValue\n {\n void return_value(const T& _value)\n {\n this->value = _value;\n }\n\n const T& getValue() const\n {\n return value;\n }\n T value;\n };\n\n // void特殊化\n template<>\n struct PromiseValue\n {\n void return_void() {}\n\n void getValue() const\n {}\n };\n\n template\n struct PromiseType : PromiseValue\n {\n using FiberType = Fiber;\n\n auto get_return_object() { return FiberType{ FiberType::Handle::from_promise(*this) }; }\n auto initial_suspend() { return std::suspend_always{}; }\n auto final_suspend() noexcept { return std::suspend_always{}; }\n void unhandled_exception() { std::terminate(); }\n\n auto yield_value(const Yield& _yield)\n {\n return operator co_await(_yield);\n }\n IAwaiter* pAwaiter = nullptr;\n };\n\n ///

\n /// Awaiter\n ///

\n template\n struct FiberAwaiter : IAwaiter\n {\n FiberAwaiter(Fiber&& f):\n fiber(std::move(f))\n {}\n\n bool await_ready() const\n {\n return !fiber.resume();\n }\n template\n void await_suspend(Handle handle)\n {\n handle.promise().pAwaiter = this;\n }\n decltype(auto) await_resume() const\n {\n return fiber.get();\n }\n bool resume() override\n {\n return fiber.resume();\n }\n\n Fiber fiber;\n 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