249 lines
8.4 KiB
C++
249 lines
8.4 KiB
C++
#pragma once
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#include "CoreTypes.h"
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#include "Templates/Invoke.h"
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#include "Templates/Utility.h"
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#include "Templates/Optional.h"
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#include "TypeTraits/TypeTraits.h"
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NAMESPACE_REDCRAFT_BEGIN
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NAMESPACE_MODULE_BEGIN(Redcraft)
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NAMESPACE_MODULE_BEGIN(Utility)
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template <typename ReferencedType> requires (CObject<ReferencedType> || CFunction<ReferencedType>)
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class TReferenceWrapper
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{
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public:
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using Type = ReferencedType;
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template <typename T = ReferencedType> requires (CConvertibleTo<T, ReferencedType&>)
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constexpr TReferenceWrapper(T&& Object)
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{
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ReferencedType& Reference = Forward<T>(Object);
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Pointer = AddressOf(Reference);
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}
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TReferenceWrapper(const TReferenceWrapper&) = default;
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template <typename T = ReferencedType> requires (CConvertibleTo<T&, ReferencedType&>)
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constexpr TReferenceWrapper(const TReferenceWrapper<T>& InValue)
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: Pointer(InValue.Pointer)
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{ }
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TReferenceWrapper& operator=(const TReferenceWrapper&) = default;
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template <typename T = ReferencedType> requires (CConvertibleTo<T&, ReferencedType&>)
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constexpr TReferenceWrapper& operator=(const TReferenceWrapper<T>& InValue)
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{
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Pointer = InValue.Pointer;
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return *this;
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}
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constexpr operator ReferencedType&() const { return *Pointer; }
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constexpr ReferencedType& Get() const { return *Pointer; }
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template <typename... Ts>
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constexpr TInvokeResult<ReferencedType&, Ts...> operator()(Ts&&... Args) const
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{
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return Invoke(Get(), Forward<Ts>(Args)...);
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}
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constexpr size_t GetTypeHash() const requires (CHashable<ReferencedType>)
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{
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return NAMESPACE_REDCRAFT::GetTypeHash(Get());
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}
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constexpr void Swap(TReferenceWrapper& InValue)
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{
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ReferencedType* Temp = Pointer;
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Pointer = InValue.Pointer;
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InValue.Pointer = Temp;
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}
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private:
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ReferencedType* Pointer;
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template <typename T> requires (CObject<T> || CFunction<T>) friend class TReferenceWrapper;
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// Optimize TOptional with these hacking
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constexpr TReferenceWrapper(FInvalid) : Pointer(nullptr) { };
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template <typename T> requires (CDestructible<T>) friend class TOptional;
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};
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template <typename T>
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TReferenceWrapper(T&) -> TReferenceWrapper<T>;
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template <typename T>
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void Ref(const T&&) = delete;
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template <typename T>
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constexpr TReferenceWrapper<T> Ref(T& InValue)
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{
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return TReferenceWrapper<T>(InValue);
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}
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template <typename T>
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constexpr TReferenceWrapper<T> Ref(TReferenceWrapper<T> InValue)
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{
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return Ref(InValue.Get());
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}
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template <typename T>
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constexpr TReferenceWrapper<const T> Ref(const T& InValue)
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{
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return TReferenceWrapper<const T>(InValue);
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}
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template <typename T>
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constexpr TReferenceWrapper<const T> Ref(TReferenceWrapper<T> InValue)
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{
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return Ref(InValue.Get());
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}
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NAMESPACE_PRIVATE_BEGIN
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template <typename T> struct TIsTReferenceWrapperImpl : FFalse { };
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template <typename T> struct TIsTReferenceWrapperImpl<TReferenceWrapper<T>> : FTrue { };
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template <typename T> struct TUnwrapReferenceImpl { using Type = T; };
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template <typename T> struct TUnwrapReferenceImpl<TReferenceWrapper<T>> { using Type = T&; };
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template <typename T> struct TUnwrapRefDecayImpl { using Type = typename TUnwrapReferenceImpl<TDecay<T>>::Type; };
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NAMESPACE_PRIVATE_END
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template <typename T>
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concept CTReferenceWrapper = NAMESPACE_PRIVATE::TIsTReferenceWrapperImpl<TRemoveCV<T>>::Value;
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template <typename T>
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using TUnwrapReference = typename NAMESPACE_PRIVATE::TUnwrapReferenceImpl<T>::Type;
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template <typename T>
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using TUnwrapRefDecay = typename NAMESPACE_PRIVATE::TUnwrapRefDecayImpl<T>::Type;
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template <typename ReferencedType>
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class TOptional<TReferenceWrapper<ReferencedType>>
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{
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private:
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using OptionalType = TReferenceWrapper<ReferencedType>;
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template <typename T>
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struct TAllowUnwrapping : TBoolConstant < !(
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CConstructibleFrom<OptionalType, TOptional<T>& >
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|| CConstructibleFrom<OptionalType, const TOptional<T>& >
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|| CConstructibleFrom<OptionalType, TOptional<T>&&>
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|| CConstructibleFrom<OptionalType, const TOptional<T>&&>
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|| CConvertibleTo< TOptional<T>&, OptionalType>
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|| CConvertibleTo<const TOptional<T>&, OptionalType>
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|| CConvertibleTo< TOptional<T>&&, OptionalType>
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|| CConvertibleTo<const TOptional<T>&&, OptionalType>
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|| CAssignableFrom<OptionalType&, TOptional<T>& >
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|| CAssignableFrom<OptionalType&, const TOptional<T>& >
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|| CAssignableFrom<OptionalType&, TOptional<T>&&>
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|| CAssignableFrom<OptionalType&, const TOptional<T>&&>
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)> { };
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public:
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using ValueType = OptionalType;
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constexpr TOptional() : Reference(Invalid) { }
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constexpr TOptional(FInvalid) : TOptional() { }
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template <typename... Ts> requires (CConstructibleFrom<OptionalType, Ts...>)
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constexpr explicit TOptional(FInPlace, Ts&&... Args)
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: Reference(Forward<Ts>(Args)...)
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{ }
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template <typename T = OptionalType> requires (CConstructibleFrom<OptionalType, T&&>
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&& !CSameAs<TRemoveCVRef<T>, FInPlace> && !CBaseOf<TOptional, TRemoveCVRef<T>>)
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constexpr explicit (!CConvertibleTo<T&&, OptionalType>) TOptional(T&& InValue)
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: TOptional(InPlace, Forward<T>(InValue))
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{ }
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TOptional(const TOptional& InValue) = default;
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TOptional(TOptional&& InValue) = default;
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template <typename T = OptionalType> requires (CConstructibleFrom<OptionalType, const T&> && TAllowUnwrapping<T>::Value)
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constexpr explicit (!CConvertibleTo<const T&, OptionalType>) TOptional(const TOptional<T>& InValue)
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: Reference(InValue.Reference)
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{ }
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~TOptional() = default;
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TOptional& operator=(const TOptional& InValue) = default;
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TOptional& operator=(TOptional&& InValue) = default;
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template <typename T = OptionalType> requires (CConstructibleFrom<OptionalType, const T&>
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&& CAssignableFrom<OptionalType&, const T&> && TAllowUnwrapping<T>::Value)
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constexpr TOptional& operator=(const TOptional<T>& InValue)
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{
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Reference = InValue.Reference;
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return *this;
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}
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template <typename T = OptionalType> requires (CConstructibleFrom<OptionalType, T&&> && CAssignableFrom<OptionalType&, T&&>)
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constexpr TOptional& operator=(T&& InValue)
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{
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Reference = InValue;
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return *this;
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}
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template <typename... ArgTypes> requires (CConstructibleFrom<OptionalType, ArgTypes...>)
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constexpr OptionalType& Emplace(ArgTypes&&... Args)
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{
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Reference = TReferenceWrapper<ReferencedType>(Forward<ArgTypes>(Args)...);
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return Reference;
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}
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constexpr bool IsValid() const { return Reference.Pointer != nullptr; }
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constexpr explicit operator bool() const { return Reference.Pointer != nullptr; }
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constexpr OptionalType& GetValue() & { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return Reference; }
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constexpr OptionalType&& GetValue() && { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return Reference; }
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constexpr const OptionalType& GetValue() const& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return Reference; }
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constexpr const OptionalType&& GetValue() const&& { checkf(IsValid(), TEXT("It is an error to call GetValue() on an unset TOptional. Please either check IsValid() or use Get(DefaultValue) instead.")); return Reference; }
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constexpr const OptionalType* operator->() const { return &GetValue(); }
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constexpr OptionalType* operator->() { return &GetValue(); }
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constexpr OptionalType& operator*() & { return GetValue(); }
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constexpr OptionalType&& operator*() && { return GetValue(); }
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constexpr const OptionalType& operator*() const& { return GetValue(); }
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constexpr const OptionalType&& operator*() const&& { return GetValue(); }
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constexpr OptionalType& Get( OptionalType& DefaultValue) & { return IsValid() ? GetValue() : DefaultValue; }
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constexpr const OptionalType& Get(const OptionalType& DefaultValue) const& { return IsValid() ? GetValue() : DefaultValue; }
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constexpr void Reset()
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{
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Reference = Invalid;
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}
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constexpr size_t GetTypeHash() const requires (CHashable<ReferencedType>)
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{
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if (!IsValid()) return 2824517378;
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return Reference.GetTypeHash();
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}
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constexpr void Swap(TOptional& InValue)
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{
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Reference.Swap(InValue.Reference);
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}
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private:
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TReferenceWrapper<ReferencedType> Reference;
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template <typename T> requires (CDestructible<T>) friend class TOptional;
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};
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NAMESPACE_MODULE_END(Utility)
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NAMESPACE_MODULE_END(Redcraft)
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NAMESPACE_REDCRAFT_END
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