/* * Copyright (c) 2018-2019 Atmosphère-NX * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #pragma once #include "../defines.hpp" namespace ams::util { namespace impl { template<typename Parent, typename Member> union OffsetOfImpl { Member Parent::* ptr; intptr_t offset; }; template<typename Parent, typename Member> constexpr inline Parent *GetParentOfMemberImpl(Member *member, Member Parent::* ptr) { return reinterpret_cast<Parent *>(reinterpret_cast<uintptr_t>(member) - OffsetOfImpl<Parent, Member>{ ptr }.offset); } template<typename Parent, typename Member> constexpr inline Parent const *GetParentOfMemberImpl(Member const *member, Member Parent::* ptr) { return reinterpret_cast<Parent *>(reinterpret_cast<uintptr_t>(member) - OffsetOfImpl<Parent, Member>{ ptr }.offset); } template<typename T> struct GetMemberPointerTraits; template<typename P, typename M> struct GetMemberPointerTraits<M P::*> { using Parent = P; using Member = M; }; template<auto MemberPtr> using GetParentType = typename GetMemberPointerTraits<decltype(MemberPtr)>::Parent; template<auto MemberPtr> using GetMemberType = typename GetMemberPointerTraits<decltype(MemberPtr)>::Member; } template<auto MemberPtr> constexpr inline impl::GetParentType<MemberPtr> *GetParentPointer(impl::GetMemberType<MemberPtr> *member) { return impl::GetParentOfMemberImpl<impl::GetParentType<MemberPtr>, impl::GetMemberType<MemberPtr>>(member, MemberPtr); } template<auto MemberPtr> constexpr inline impl::GetParentType<MemberPtr> const *GetParentPointer(impl::GetMemberType<MemberPtr> const *member) { return impl::GetParentOfMemberImpl<impl::GetParentType<MemberPtr>, impl::GetMemberType<MemberPtr>>(member, MemberPtr); } template<auto MemberPtr> constexpr inline impl::GetParentType<MemberPtr> &GetParentReference(impl::GetMemberType<MemberPtr> *member) { return *impl::GetParentOfMemberImpl<impl::GetParentType<MemberPtr>, impl::GetMemberType<MemberPtr>>(member, MemberPtr); } template<auto MemberPtr> constexpr inline impl::GetParentType<MemberPtr> const &GetParentReference(impl::GetMemberType<MemberPtr> const *member) { return *impl::GetParentOfMemberImpl<impl::GetParentType<MemberPtr>, impl::GetMemberType<MemberPtr>>(member, MemberPtr); } }