Does not support `msd::channel<std::function<void()>>`

[leiless]

It seems that msd::channel does not support function pointer.

[]() {} >> chan;
( []() {} ) >> chan;

[andreiavrammsd]

I never considered this. Is there a real use case to pass functions between threads?

[leiless]

I have a single socket fd, in which all the messages (request and response) should be done sequentially. So I want some callback to be passed to sequentia-lize between those messages.

Concurrent requests will cause the response to be out of order (byte streams).

[andreiavrammsd]

Understood. It will take me a while to find time for this. Please leave the issue open.

If it's urgent for you, I can only suggest to use a class in the channel (with dynamic polymorphism or std::variant) if it's suitable for you.

[andreiavrammsd]

This is because you try to push a lambda into a channel with type std::function<void()>. But the lambda does not have that type; it has a unique type.

You can assign a lambda to a std::function object.

using function_type = std::function<void()>;
msd::channel<function_type> channel;

const function_type func = []() {};
channel << func;

function_type out;
channel >> out;
out();

Does this help you?

[andreiavrammsd]

@leiless, have you tested this?

[andreiavrammsd]

When you test again, please come back if the proposed solution does not work.