What is a Y combinator where I see some ppl using it, it looks something like this:
template<class F>
struct y_combinate_t {
F f;
template<class...Args>
decltype(auto) operator()(Args&&...args)const {
return f(*this, std::forward<Args>(args)...);
}
};
template<class F>
y_combinate_t<std::decay_t<F>> y_combinate( F&& f ) {
return {std::forward<F>(f)};
};