指的是提案：P0914R1
gcc-14和clang-18都显示：只有MyCoroutinePromise::MyCoroutinePromise()可以用。

#include <coroutine>
#include <iostream>

struct MyClass;
struct MyCoroutine;
struct MyCoroutinePromise
{
    MyClass* parent;
    MyCoroutinePromise(MyClass* p) // <--- 
        : parent(p)
    {
        std::cout << "Promise constructor called with parent: " << p << std::endl;
    }

    MyCoroutine get_return_object();

    std::suspend_always initial_suspend() noexcept { return {}; }
    std::suspend_always   final_suspend() noexcept { return {}; }

    void return_void() {}
    void unhandled_exception() {}
};

struct MyCoroutine
{
    using promise_type = MyCoroutinePromise;
    std::coroutine_handle<promise_type> handle;

    MyCoroutine(std::coroutine_handle<promise_type> h)
        : handle(h)
    {}

    ~MyCoroutine()
    {
        handle.destroy();
    }
};

MyCoroutine MyCoroutinePromise::get_return_object()
{
    return MyCoroutine{std::coroutine_handle<MyCoroutinePromise>::from_promise(*this)};
}

struct MyClass
{
    MyCoroutine my_coroutine()
    {
        co_return;
    }
};

int main()
{
    MyClass obj;
    obj.my_coroutine();
    return 0;
}

--
修改:allegro FROM 61.188.76.*
FROM 61.188.76.*