function_meta.h

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//-------------------------------------------------------------------
//  Nano RPC
//  https://github.com/tdv/nanorpc
//  Created:     05.2018
//  Copyright (C) 2018 tdv
//-------------------------------------------------------------------
 
#ifndef __NANO_RPC_CORE_DETAIL_FUNCTION_META_H__
#define __NANO_RPC_CORE_DETAIL_FUNCTION_META_H__
 
// STD
#include <functional>
#include <tuple>
#include <type_traits>
 
namespace nanorpc::core::detail
{
 
template <typename>
struct function_meta;
 
template <typename R, typename ... T>
struct function_meta<std::function<R (T ... )>>
{
    using return_type = std::decay_t<R>;
    using arguments_tuple_type = std::tuple<std::decay_t<T> ... >;
};
 
template<typename T>
struct memfun_type
{
    using type = void;
};
 
template<typename Ret, typename Class, typename... Args>
struct memfun_type<Ret(Class::*)(Args...) const>
{
    using type = std::function<Ret(Args...)>;
};
 
template<typename F>
typename memfun_type<decltype(&F::operator())>::type
lambdaToFunction(F const &func)
{ // Function from lambda !
    return func;
}
 
 
}   // namespace nanorpc::core::detail
 
 
#endif  // !__NANO_RPC_CORE_DETAIL_FUNCTION_META_H__