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