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#include <iostream>
#include <exception>
#include <cassert>

#if __has_include("coroutine")
#include <coroutine>
namespace stdcoro = std;
#else
#include <experimental/coroutine>
namespace stdcoro = std::experimental;
#endif

struct footable : stdcoro::suspend_always {
    footable() noexcept = default;
    ~footable() { assert(released); }
    footable(const footable&) = delete;

    using coro_handle = stdcoro::coroutine_handle<>;

    void await_suspend(coro_handle awaiter) noexcept {
        std::cout << "suspending to footable " << this << std::endl;
        assert(!handle);
        handle = awaiter;
    }
    void await_resume() noexcept {
        std::cout << "resuming from footable " << this << std::endl;
        assert(handle);
        handle = {};
    }

    void operator()() noexcept {
        std::cout << "operator() on " << this << std::endl;
        assert(handle);
        handle.resume();
        handle = {};
    }

    void release() noexcept { released = true; }
private:
    coro_handle handle;
    bool released = false;
};

struct footask {
    struct promise_type {
        using coro_handle = stdcoro::coroutine_handle<promise_type>;

        stdcoro::suspend_never initial_suspend() noexcept { return {}; }
        stdcoro::suspend_never final_suspend() noexcept { std::cout << "final suspend" << std::endl; return {}; }
        void unhandled_exception() {}
        void return_void() noexcept { std::cout << "coro returns" << std::endl; }

        footask get_return_object() { return footask{ coro_handle::from_promise(*this) }; }
    };

    footask(promise_type::coro_handle handle) : handle(handle) {}
    ~footask() { assert(handle.done()); }

    promise_type::coro_handle handle;
};

struct bar {
    bar() = default;
    bar(const bar&) = delete;

    footable foo{};
    footask task = taskfun();

    footask taskfun() noexcept {
        std::cout << "coro begin" << std::endl;
        co_await foo;
        std::cout << "coro end" << std::endl;
    }
};

int main() {
    bar foobar;
    foobar.foo();
    assert(foobar.task.handle.done());
    std::cout << "releasing" << std::endl;
    foobar.foo.release();
    std::cout << "done" << std::endl;
    return 0;
}


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