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#pragma once
#include <functional>
namespace y_combinator_details {
template <class Fun> struct y_combinator_result {
template <class T>
explicit y_combinator_result(T &&fun_) : fun(std::forward<T>(fun_)) {}
template <class... Args> decltype(auto) operator()(Args &&...args) {
return fun(std::ref(*this), std::forward<Args>(args)...);
}
private:
Fun fun;
};
} // namespace y_combinator_details
template <class Fun> static inline decltype(auto) y_combinator(Fun &&fun) {
return y_combinator_details::y_combinator_result<std::decay_t<Fun>>(
std::forward<Fun>(fun));
}
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