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feat(templates): add type traits to determine if it is TAny etc

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This commit is contained in:
_Redstone_c_
2022-03-31 17:36:48 +08:00
parent 54ab72224f
commit 5f4b0d8c22
6 changed files with 33 additions and 24 deletions
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12
Redcraft.Utility/Source/Public/Templates/Variant.h
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@ -245,7 +245,7 @@ struct TVariant
{ }
template <typename T> requires NAMESPACE_PRIVATE::TVariantSelectedType<typename TRemoveReference<T>::Type, Types...>::Value
&& (!TIsInPlaceTypeSpecialization<typename TRemoveCVRef<T>::Type>::Value) && (!TIsInPlaceIndexSpecialization<typename TRemoveCVRef<T>::Type>::Value)
&& (!TIsTInPlaceType<typename TRemoveCVRef<T>::Type>::Value) && (!TIsTInPlaceIndex<typename TRemoveCVRef<T>::Type>::Value)
&& (!TIsSame<typename TRemoveCVRef<T>::Type, TVariant>::Value)
constexpr TVariant(T&& InValue) : TVariant(InPlaceType<typename NAMESPACE_PRIVATE::TVariantSelectedType<typename TRemoveReference<T>::Type, Types...>::Type>, Forward<T>(InValue))
{ }
@ -532,16 +532,16 @@ constexpr void Swap(TVariant<Types...>& A, TVariant<Types...>& B)
B = MoveTemp(Temp);
}
template <typename T > struct TIsVariantSpecialization : FFalse { };
template <typename... Types> struct TIsVariantSpecialization<TVariant<Types...>> : FTrue { };
template <typename T > struct TIsTVariant : FFalse { };
template <typename... Types> struct TIsTVariant<TVariant<Types...>> : FTrue { };
template <typename VariantType> requires TIsVariantSpecialization<typename TRemoveCVRef<VariantType>::Type>::Value
template <typename VariantType> requires TIsTVariant<typename TRemoveCVRef<VariantType>::Type>::Value
struct TVariantAlternativeSize : TConstant<size_t, VariantType::AlternativeSize> { };
template <size_t I, typename VariantType> requires TIsVariantSpecialization<typename TRemoveCVRef<VariantType>::Type>::Value
template <size_t I, typename VariantType> requires TIsTVariant<typename TRemoveCVRef<VariantType>::Type>::Value
struct TVariantAlternativeType { using Type = typename TCopyCV<typename TRemoveReference<VariantType>::Type, typename TRemoveCVRef<VariantType>::Type::template TAlternativeType<I>::Type>::Type; };
template <typename T, typename VariantType> requires TIsVariantSpecialization<typename TRemoveCVRef<VariantType>::Type>::Value
template <typename T, typename VariantType> requires TIsTVariant<typename TRemoveCVRef<VariantType>::Type>::Value
struct TVariantAlternativeIndex : VariantType::template TAlternativeIndex<T> { };
NAMESPACE_MODULE_END(Utility)