memfn_signature.hpp

#ifndef TERMOX_WIDGET_DETAIL_MEMFN_SIGNATURE_HPP
#define TERMOX_WIDGET_DETAIL_MEMFN_SIGNATURE_HPP
namespace ox::detail {
 
// Could be moved into Signals library with a deduction guide for Slot.
 
template <typename>
struct MemFn_signature {};
 
template <typename R, typename T, bool N, typename... Args>
struct MemFn_signature<R (T::*)(Args...) noexcept(N)> {
    using type = R(Args...);
};
 
template <typename R, typename T, bool N, typename... Args>
struct MemFn_signature<R (T::*)(Args...)& noexcept(N)> {
    using type = R(Args...);
};
 
template <typename R, typename T, bool N, typename... Args>
struct MemFn_signature<R (T::*)(Args...) const noexcept(N)> {
    using type = R(Args...);
};
 
template <typename R, typename T, bool N, typename... Args>
struct MemFn_signature<R (T::*)(Args...) const& noexcept(N)> {
    using type = R(Args...);
};
 
template <typename F>
using Call_signature_t =
    typename MemFn_signature<decltype(&F::operator())>::type;
 
}  // namespace ox::detail
#endif  // TERMOX_WIDGET_DETAIL_MEMFN_SIGNATURE_HPP