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common: parent_of_member: Fix build for OffsetOf().

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bunnei 2021-05-01 14:32:36 -07:00
parent 27a6ef64fd
commit e02785be83
1 changed files with 4 additions and 4 deletions
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8
src/common/parent_of_member.h
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@ -133,27 +133,27 @@ template <auto MemberPtr>
using GetMemberType = typename GetMemberPointerTraits<decltype(MemberPtr)>::Member; using GetMemberType = typename GetMemberPointerTraits<decltype(MemberPtr)>::Member;
template <auto MemberPtr, typename RealParentType = GetParentType<MemberPtr>> template <auto MemberPtr, typename RealParentType = GetParentType<MemberPtr>>
static inline std::ptrdiff_t OffsetOf = [] { constexpr std::ptrdiff_t OffsetOf() {
using DeducedParentType = GetParentType<MemberPtr>; using DeducedParentType = GetParentType<MemberPtr>;
using MemberType = GetMemberType<MemberPtr>; using MemberType = GetMemberType<MemberPtr>;
static_assert(std::is_base_of<DeducedParentType, RealParentType>::value || static_assert(std::is_base_of<DeducedParentType, RealParentType>::value ||
std::is_same<RealParentType, DeducedParentType>::value); std::is_same<RealParentType, DeducedParentType>::value);
return OffsetOfCalculator<RealParentType, MemberType>::OffsetOf(MemberPtr); return OffsetOfCalculator<RealParentType, MemberType>::OffsetOf(MemberPtr);
}(); };
} // namespace impl } // namespace impl
template <auto MemberPtr, typename RealParentType = impl::GetParentType<MemberPtr>> template <auto MemberPtr, typename RealParentType = impl::GetParentType<MemberPtr>>
constexpr RealParentType& GetParentReference(impl::GetMemberType<MemberPtr>* member) { constexpr RealParentType& GetParentReference(impl::GetMemberType<MemberPtr>* member) {
std::ptrdiff_t Offset = impl::OffsetOf<MemberPtr, RealParentType>; std::ptrdiff_t Offset = impl::OffsetOf<MemberPtr, RealParentType>();
return *static_cast<RealParentType*>( return *static_cast<RealParentType*>(
static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(member)) - Offset)); static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(member)) - Offset));
} }
template <auto MemberPtr, typename RealParentType = impl::GetParentType<MemberPtr>> template <auto MemberPtr, typename RealParentType = impl::GetParentType<MemberPtr>>
constexpr RealParentType const& GetParentReference(impl::GetMemberType<MemberPtr> const* member) { constexpr RealParentType const& GetParentReference(impl::GetMemberType<MemberPtr> const* member) {
std::ptrdiff_t Offset = impl::OffsetOf<MemberPtr, RealParentType>; std::ptrdiff_t Offset = impl::OffsetOf<MemberPtr, RealParentType>();
return *static_cast<const RealParentType*>(static_cast<const void*>( return *static_cast<const RealParentType*>(static_cast<const void*>(
static_cast<const uint8_t*>(static_cast<const void*>(member)) - Offset)); static_cast<const uint8_t*>(static_cast<const void*>(member)) - Offset));
} }