typegetter.h

Go to the documentation of this file.

/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <tuple>
 
namespace LC::Util
{
    namespace detail
    {
        template<typename R, typename... Args>
        std::tuple<R, Args...> TypeGetter (R (*) (Args...));
 
        template<typename F>
        auto TypeGetter (F&& f) -> decltype (TypeGetter (+f));
 
        template<typename C, typename R, typename... Args>
        std::tuple<R, Args...> TypeGetter (R (C::*) (Args...) const);
 
        template<typename C, typename R, typename... Args>
        std::tuple<R, Args...> TypeGetter (R (C::*) (Args...));
 
        template<typename C>
        decltype (TypeGetter (&C::operator ())) TypeGetter (const C& c);
    }
 
    template<typename F, size_t Idx>
    using ArgType_t = std::tuple_element_t<Idx + 1, decltype (detail::TypeGetter (*static_cast<F*> (nullptr)))>;
 
    template<typename F>
    using RetType_t = std::tuple_element_t<0, decltype (detail::TypeGetter (*static_cast<F*> (nullptr)))>;
 
    namespace detail
    {
        template<typename>
        struct DecomposeMemberPtr
        {
        };
 
        template<typename R, typename C>
        struct DecomposeMemberPtr<R (C::*)>
        {
            using Value_t = R;
            using StructType_t = C;
        };
    }
 
    template<typename PtrType>
    using MemberTypeType_t = typename detail::DecomposeMemberPtr<PtrType>::Value_t;
 
    template<typename PtrType>
    using MemberTypeStruct_t = typename detail::DecomposeMemberPtr<PtrType>::StructType_t;
 
    template<auto Ptr>
    using MemberPtrType_t = MemberTypeType_t<decltype (Ptr)>;
 
    template<auto Ptr>
    using MemberPtrStruct_t = MemberTypeStruct_t<decltype (Ptr)>;
}