551 lines
19 KiB
C++
551 lines
19 KiB
C++
#pragma once
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#include "CoreTypes.h"
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#include "Templates/Any.h"
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#include "Templates/Tuple.h"
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#include "Templates/Invoke.h"
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#include "Memory/Alignment.h"
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#include "Templates/Utility.h"
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#include "TypeTraits/TypeTraits.h"
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#include "Miscellaneous/AssertionMacros.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 F> requires CFunction<F>
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struct TFunctionRef;
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template <typename F> requires CFunction<F>
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struct TFunction;
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template <typename F> requires CFunction<F>
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struct TUniqueFunction;
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NAMESPACE_PRIVATE_BEGIN
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template <typename T> struct TIsTFunctionRef : FFalse { };
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template <typename F> struct TIsTFunctionRef<TFunctionRef<F>> : FTrue { };
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template <typename T> struct TIsTFunction : FFalse { };
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template <typename F> struct TIsTFunction<TFunction<F>> : FTrue { };
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template <typename T> struct TIsTUniqueFunction : FFalse { };
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template <typename F> struct TIsTUniqueFunction<TUniqueFunction<F>> : FTrue { };
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NAMESPACE_PRIVATE_END
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template <typename T> concept CTFunctionRef = NAMESPACE_PRIVATE::TIsTFunctionRef<T>::Value;
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template <typename T> concept CTFunction = NAMESPACE_PRIVATE::TIsTFunction<T>::Value;
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template <typename T> concept CTUniqueFunction = NAMESPACE_PRIVATE::TIsTUniqueFunction<T>::Value;
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NAMESPACE_PRIVATE_BEGIN
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template <typename T>
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constexpr bool FunctionIsBound(const T& Func)
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{
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if constexpr (CPointer<T> || CMemberPointer<T> || CTFunctionRef<T> || CTFunction<T> || CTUniqueFunction<T>)
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{
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return !!Func;
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}
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else
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{
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return true;
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}
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}
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template <typename Signature, typename F> struct TIsInvocableSignature : FFalse { };
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template <typename Ret, typename... Types, typename F>
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struct TIsInvocableSignature<Ret(Types...), F>
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: TBoolConstant<CInvocableResult<Ret, F, Types...> && CInvocableResult<Ret, F&, Types...>>
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{ };
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template <typename Ret, typename... Types, typename F> struct TIsInvocableSignature<Ret(Types...) & , F> : TBoolConstant<CInvocableResult<Ret, F&, Types...>> { };
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template <typename Ret, typename... Types, typename F> struct TIsInvocableSignature<Ret(Types...) &&, F> : TBoolConstant<CInvocableResult<Ret, F , Types...>> { };
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template <typename Ret, typename... Types, typename F>
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struct TIsInvocableSignature<Ret(Types...) const, F>
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: TBoolConstant<CInvocableResult<Ret, const F, Types...> && CInvocableResult<Ret, const F&, Types...>>
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{ };
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template <typename Ret, typename... Types, typename F> struct TIsInvocableSignature<Ret(Types...) const& , F> : TBoolConstant<CInvocableResult<Ret, const F&, Types...>> { };
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template <typename Ret, typename... Types, typename F> struct TIsInvocableSignature<Ret(Types...) const&&, F> : TBoolConstant<CInvocableResult<Ret, const F , Types...>> { };
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template <typename F> struct TFunctionInfo;
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) > { using Fn = Ret(Types...); using CVRef = int; };
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) & > { using Fn = Ret(Types...); using CVRef = int&; };
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) && > { using Fn = Ret(Types...); using CVRef = int&&; };
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) const > { using Fn = Ret(Types...); using CVRef = const int; };
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) const& > { using Fn = Ret(Types...); using CVRef = const int&; };
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template <typename Ret, typename... Types> struct TFunctionInfo<Ret(Types...) const&&> { using Fn = Ret(Types...); using CVRef = const int&&; };
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template <typename CallableType>
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struct alignas(16) FFunctionStorage
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{
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//~ Begin CAnyCustomStorage Interface
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inline static constexpr size_t InlineSize = 64 - sizeof(uintptr) - sizeof(CallableType);
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inline static constexpr size_t InlineAlignment = 16;
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constexpr void* InlineAllocation() { return &InlineAllocationImpl; }
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constexpr const void* InlineAllocation() const { return &InlineAllocationImpl; }
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constexpr void*& HeapAllocation() { return HeapAllocationImpl; }
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constexpr void* HeapAllocation() const { return HeapAllocationImpl; }
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constexpr uintptr& TypeInfo() { return TypeInfoImpl; }
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constexpr uintptr TypeInfo() const { return TypeInfoImpl; }
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constexpr void CopyCustom(const FFunctionStorage& InValue) { Callable = InValue.Callable; }
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constexpr void MoveCustom( FFunctionStorage&& InValue) { Callable = InValue.Callable; }
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//~ End CAnyCustomStorage Interface
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union
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{
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uint8 InlineAllocationImpl[InlineSize];
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void* HeapAllocationImpl;
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};
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uintptr TypeInfoImpl;
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CallableType Callable;
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};
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template <typename F, typename CVRef, bool bIsRef> struct TFunctionImpl;
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template <typename Ret, typename... Types, typename CVRef, bool bIsRef>
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struct TFunctionImpl<Ret(Types...), CVRef, bIsRef>
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{
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public:
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using ResultType = Ret;
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using ArgumentType = TTuple<Types...>;
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TFunctionImpl() = default;
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TFunctionImpl(const TFunctionImpl&) = default;
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TFunctionImpl(TFunctionImpl&& InValue) = default;
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TFunctionImpl& operator=(const TFunctionImpl&) = default;
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TFunctionImpl& operator=(TFunctionImpl&&) = default;
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~TFunctionImpl() = default;
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FORCEINLINE ResultType operator()(Types... Args) requires (CSameAs<CVRef, int >) { return CallImpl(Forward<Types>(Args)...); }
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FORCEINLINE ResultType operator()(Types... Args) & requires (CSameAs<CVRef, int& >) { return CallImpl(Forward<Types>(Args)...); }
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FORCEINLINE ResultType operator()(Types... Args) && requires (CSameAs<CVRef, int&&>) { return CallImpl(Forward<Types>(Args)...); }
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FORCEINLINE ResultType operator()(Types... Args) const requires (CSameAs<CVRef, const int >) { return CallImpl(Forward<Types>(Args)...); }
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FORCEINLINE ResultType operator()(Types... Args) const& requires (CSameAs<CVRef, const int& >) { return CallImpl(Forward<Types>(Args)...); }
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FORCEINLINE ResultType operator()(Types... Args) const&& requires (CSameAs<CVRef, const int&&>) { return CallImpl(Forward<Types>(Args)...); }
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constexpr bool IsValid() const { return GetCallableImpl() != nullptr; }
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constexpr explicit operator bool() const { return GetCallableImpl() != nullptr; }
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FORCEINLINE const type_info& TargetType() const requires (!bIsRef) { return IsValid() ? Storage.GetTypeInfo() : typeid(void); };
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template <typename T> FORCEINLINE T& Target() & requires (!bIsRef) && CDestructible<TDecay<T>> { return static_cast< StorageType& >(Storage).template GetValue<T>(); }
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template <typename T> FORCEINLINE T&& Target() && requires (!bIsRef) && CDestructible<TDecay<T>> { return static_cast< StorageType&&>(Storage).template GetValue<T>(); }
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template <typename T> FORCEINLINE const T& Target() const& requires (!bIsRef) && CDestructible<TDecay<T>> { return static_cast<const StorageType& >(Storage).template GetValue<T>(); }
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template <typename T> FORCEINLINE const T&& Target() const&& requires (!bIsRef) && CDestructible<TDecay<T>> { return static_cast<const StorageType&&>(Storage).template GetValue<T>(); }
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constexpr void Swap(TFunctionImpl& InValue) requires (!bIsRef)
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{
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using NAMESPACE_REDCRAFT::Swap;
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if (!IsValid() && !InValue.IsValid()) return;
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if (IsValid() && !InValue.IsValid())
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{
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InValue = MoveTemp(*this);
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ResetImpl();
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return;
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}
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if (InValue.IsValid() && !IsValid())
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{
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*this = MoveTemp(InValue);
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InValue.ResetImpl();
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return;
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}
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Swap(Storage, InValue.Storage);
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}
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private:
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using StoragePtrType = TCopyConst<CVRef, void>*;
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using CallableType = ResultType(*)(StoragePtrType, Types&&...);
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struct FunctionRefStorage
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{
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StoragePtrType Ptr;
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CallableType Callable;
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};
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using FunctionStorage = TAny<FFunctionStorage<CallableType>>;
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using StorageType = TConditional<bIsRef, FunctionRefStorage, FunctionStorage>;
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StorageType Storage;
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FORCEINLINE CallableType& GetCallableImpl()
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{
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if constexpr (bIsRef) return Storage.Callable;
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else return Storage.GetCustomStorage().Callable;
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}
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FORCEINLINE CallableType GetCallableImpl() const
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{
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if constexpr (bIsRef) return Storage.Callable;
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else return Storage.GetCustomStorage().Callable;
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}
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FORCEINLINE ResultType CallImpl(Types&&... Args)
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{
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checkf(IsValid(), TEXT("Attempting to call an unbound TFunction!"));
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if constexpr (bIsRef) return GetCallableImpl()(Storage.Ptr, Forward<Types>(Args)...);
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else return GetCallableImpl()(&Storage, Forward<Types>(Args)...);
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}
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FORCEINLINE ResultType CallImpl(Types&&... Args) const
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{
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checkf(IsValid(), TEXT("Attempting to call an unbound TFunction!"));
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if constexpr (bIsRef) return GetCallableImpl()(Storage.Ptr, Forward<Types>(Args)...);
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else return GetCallableImpl()(&Storage, Forward<Types>(Args)...);
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}
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protected:
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template <typename DecayedType, typename... ArgTypes>
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FORCEINLINE void EmplaceImpl(ArgTypes&&... Args)
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{
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using FuncType = TCopyConst<TRemoveReference<CVRef>, DecayedType>;
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if constexpr (bIsRef) Storage.Ptr = (AddressOf(Args), ...);
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else Storage.template Emplace<DecayedType>(Forward<ArgTypes>(Args)...);
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GetCallableImpl() = [](StoragePtrType Storage, Types&&... Args) -> ResultType
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{
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using InvokeType = TConditional<
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CReference<CVRef>,
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TCopyCVRef<CVRef, FuncType>,
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TCopyCVRef<CVRef, FuncType>&
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>;
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const auto GetFunc = [Storage]() -> InvokeType
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{
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if constexpr (!bIsRef) return static_cast<TCopyConst<CVRef, FunctionStorage>*>(Storage)->template GetValue<DecayedType>();
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else return static_cast<InvokeType>(*reinterpret_cast<FuncType*>(Storage));
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};
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return InvokeResult<ResultType>(GetFunc(), Forward<Types>(Args)...);
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};
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}
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FORCEINLINE void AssignImpl(const TFunctionImpl& InValue)
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{
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if (InValue.IsValid()) Storage = InValue.Storage;
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else ResetImpl();
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}
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FORCEINLINE void AssignImpl(TFunctionImpl&& InValue)
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{
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if (InValue.IsValid())
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{
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Storage = MoveTemp(InValue.Storage);
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InValue.ResetImpl();
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}
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else ResetImpl();
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}
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constexpr void ResetImpl() { GetCallableImpl() = nullptr; }
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};
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NAMESPACE_PRIVATE_END
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template <typename F> requires CFunction<F>
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struct TFunctionRef
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: public NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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true>
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{
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private:
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using Super = NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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true>;
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public:
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TFunctionRef() = delete;
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TFunctionRef(const TFunctionRef& InValue) = default;
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TFunctionRef(TFunctionRef&& InValue) = default;
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TFunctionRef& operator=(const TFunctionRef& InValue) = delete;
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TFunctionRef& operator=(TFunctionRef&& InValue) = delete;
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template <typename T> requires (!CTFunctionRef<TDecay<T>>) && (!CTInPlaceType<TDecay<T>>)
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&& NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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FORCEINLINE TFunctionRef(T&& InValue)
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{
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using DecayedType = TDecay<T>;
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checkf(NAMESPACE_PRIVATE::FunctionIsBound(InValue), TEXT("Cannot bind a null/unbound callable to a TFunctionRef"));
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Super::template EmplaceImpl<DecayedType>(Forward<T>(InValue));
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}
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template <typename T>
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TFunctionRef(const T&&) = delete;
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};
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template <typename F> requires CFunction<F>
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struct TFunction
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: public NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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false>
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{
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private:
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using Super = NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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false>;
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public:
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constexpr TFunction(nullptr_t = nullptr) { Super::ResetImpl(); }
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FORCEINLINE TFunction(const TFunction& InValue) = default;
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FORCEINLINE TFunction(TFunction&& InValue) : Super(MoveTemp(InValue)) { InValue.ResetImpl(); }
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FORCEINLINE TFunction& operator=(const TFunction& InValue)
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{
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Super::AssignImpl(InValue);
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return *this;
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}
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FORCEINLINE TFunction& operator=(TFunction&& InValue)
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{
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if (&InValue == this) return *this;
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Super::AssignImpl(MoveTemp(InValue));
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return *this;
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}
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template <typename T> requires (!CTInPlaceType<TDecay<T>>)
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&& (!CTFunctionRef<TDecay<T>>) && (!CTFunction<TDecay<T>>) && (!CTUniqueFunction<TDecay<T>>)
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&& CConstructibleFrom<TDecay<T>, T&&> && CCopyConstructible<TDecay<T>>
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&& NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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FORCEINLINE TFunction(T&& InValue)
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{
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using DecayedType = TDecay<T>;
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if (!NAMESPACE_PRIVATE::FunctionIsBound(InValue)) Super::ResetImpl();
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else Super::template EmplaceImpl<DecayedType>(Forward<T>(InValue));
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}
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template <typename T, typename... ArgTypes> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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&& CConstructibleFrom<TDecay<T>, ArgTypes...> && CCopyConstructible<TDecay<T>>
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FORCEINLINE TFunction(TInPlaceType<T>, ArgTypes&&... Args)
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{
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using DecayedType = TDecay<T>;
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Super::template EmplaceImpl<DecayedType>(Forward<ArgTypes>(Args)...);
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}
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constexpr TFunction& operator=(nullptr_t) { Super::ResetImpl(); return *this; }
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template <typename T> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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&& (!CTFunctionRef<TDecay<T>>) && (!CTFunction<TDecay<T>>) && (!CTUniqueFunction<TDecay<T>>)
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&& CConstructibleFrom<TDecay<T>, T&&> && CCopyConstructible<TDecay<T>>
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FORCEINLINE TFunction& operator=(T&& InValue)
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{
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using DecayedType = TDecay<T>;
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if (!NAMESPACE_PRIVATE::FunctionIsBound(InValue)) Super::ResetImpl();
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else Super::template EmplaceImpl<DecayedType>(Forward<T>(InValue));
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return *this;
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}
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template <typename T, typename... ArgTypes> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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&& CConstructibleFrom<TDecay<T>, ArgTypes...>&& CCopyConstructible<TDecay<T>>
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FORCEINLINE TDecay<T>& Emplace(ArgTypes&&... Args)
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{
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using DecayedType = TDecay<T>;
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Super::template EmplaceImpl<DecayedType>(Forward<ArgTypes>(Args)...);
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return Super::template Target<DecayedType>();
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}
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constexpr void Reset() { Super::ResetImpl(); }
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};
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template <typename F> requires CFunction<F>
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struct TUniqueFunction
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: public NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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false>
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{
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private:
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using Super = NAMESPACE_PRIVATE::TFunctionImpl<
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::Fn,
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typename NAMESPACE_PRIVATE::TFunctionInfo<F>::CVRef,
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false>;
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public:
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constexpr TUniqueFunction(nullptr_t = nullptr) { Super::ResetImpl(); }
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FORCEINLINE TUniqueFunction(const TUniqueFunction& InValue) = delete;
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TUniqueFunction(TUniqueFunction&& InValue) : Super(MoveTemp(InValue)) { InValue.ResetImpl(); }
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FORCEINLINE TUniqueFunction& operator=(const TUniqueFunction& InValue) = delete;
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FORCEINLINE TUniqueFunction& operator=(TUniqueFunction&& InValue)
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{
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if (&InValue == this) return *this;
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Super::AssignImpl(MoveTemp(InValue));
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return *this;
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}
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FORCEINLINE TUniqueFunction(const TFunction<F>& InValue)
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: Super(*reinterpret_cast<const TUniqueFunction*>(&InValue))
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{ }
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FORCEINLINE TUniqueFunction(TFunction<F>&& InValue)
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: Super(MoveTemp(*reinterpret_cast<const TUniqueFunction*>(&InValue)))
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{
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InValue.Reset();
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}
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FORCEINLINE TUniqueFunction& operator=(const TFunction<F>& InValue)
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{
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Super::AssignImpl(*reinterpret_cast<const TUniqueFunction*>(&InValue));
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return *this;
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}
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FORCEINLINE TUniqueFunction& operator=(TFunction<F>&& InValue)
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{
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Super::AssignImpl(MoveTemp(*reinterpret_cast<TUniqueFunction*>(&InValue)));
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return *this;
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}
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template <typename T> requires (!CTInPlaceType<TDecay<T>>)
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&& (!CTFunctionRef<TDecay<T>>) && (!CTFunction<TDecay<T>>) && (!CTUniqueFunction<TDecay<T>>)
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&& CConstructibleFrom<TDecay<T>, T&&> && CMoveConstructible<TDecay<T>>
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&& NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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FORCEINLINE TUniqueFunction(T&& InValue)
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{
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using DecayedType = TDecay<T>;
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if (!NAMESPACE_PRIVATE::FunctionIsBound(InValue)) Super::ResetImpl();
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else Super::template EmplaceImpl<DecayedType>(Forward<T>(InValue));
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}
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template <typename T, typename... ArgTypes> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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&& CConstructibleFrom<TDecay<T>, ArgTypes...> && CMoveConstructible<TDecay<T>>
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FORCEINLINE TUniqueFunction(TInPlaceType<T>, ArgTypes&&... Args)
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{
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using DecayedType = TDecay<T>;
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Super::template EmplaceImpl<DecayedType>(Forward<ArgTypes>(Args)...);
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}
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constexpr TUniqueFunction& operator=(nullptr_t) { Super::ResetImpl(); return *this; }
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template <typename T> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
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&& (!CTFunctionRef<TDecay<T>>) && (!CTFunction<TDecay<T>>) && (!CTUniqueFunction<TDecay<T>>)
|
|
&& CConstructibleFrom<TDecay<T>, T&&>&& CMoveConstructible<TDecay<T>>
|
|
FORCEINLINE TUniqueFunction& operator=(T&& InValue)
|
|
{
|
|
using DecayedType = TDecay<T>;
|
|
|
|
if (!NAMESPACE_PRIVATE::FunctionIsBound(InValue)) Super::ResetImpl();
|
|
else Super::template EmplaceImpl<DecayedType>(Forward<T>(InValue));
|
|
|
|
return *this;
|
|
}
|
|
|
|
template <typename T, typename... ArgTypes> requires NAMESPACE_PRIVATE::TIsInvocableSignature<F, TDecay<T>>::Value
|
|
&& CConstructibleFrom<TDecay<T>, ArgTypes...>&& CMoveConstructible<TDecay<T>>
|
|
FORCEINLINE TDecay<T>& Emplace(ArgTypes&&... Args)
|
|
{
|
|
using DecayedType = TDecay<T>;
|
|
Super::template EmplaceImpl<DecayedType>(Forward<ArgTypes>(Args)...);
|
|
return Super::template Target<DecayedType>();
|
|
}
|
|
|
|
constexpr void Reset() { Super::ResetImpl(); }
|
|
|
|
};
|
|
|
|
template <typename F>
|
|
constexpr bool operator==(const TFunctionRef<F>& LHS, nullptr_t)
|
|
{
|
|
return !LHS;
|
|
}
|
|
|
|
template <typename F>
|
|
constexpr bool operator==(const TFunction<F>& LHS, nullptr_t)
|
|
{
|
|
return !LHS;
|
|
}
|
|
|
|
template <typename F>
|
|
constexpr bool operator==(const TUniqueFunction<F>& LHS, nullptr_t)
|
|
{
|
|
return !LHS;
|
|
}
|
|
|
|
static_assert(sizeof(TFunction<void()>) == 64, "The byte size of TFunction is unexpected");
|
|
static_assert(sizeof(TUniqueFunction<void()>) == 64, "The byte size of TUniqueFunction is unexpected");
|
|
|
|
NAMESPACE_PRIVATE_BEGIN
|
|
|
|
template <typename F>
|
|
struct TNotFunction
|
|
{
|
|
F Storage;
|
|
|
|
TNotFunction(const TNotFunction&) = default;
|
|
TNotFunction(TNotFunction&&) = default;
|
|
|
|
template <typename InF>
|
|
constexpr TNotFunction(InF&& InFunc) : Storage(Forward<InF>(InFunc)) { }
|
|
|
|
template <typename... Types> requires CInvocable<F&, Types&&...>
|
|
constexpr auto operator()(Types&&... Args) &
|
|
-> decltype(!Invoke(Storage, Forward<Types>(Args)...))
|
|
{
|
|
return !Invoke(Storage, Forward<Types>(Args)...);
|
|
}
|
|
|
|
template <typename... Types> requires CInvocable<F&&, Types&&...>
|
|
constexpr auto operator()(Types&&... Args) &&
|
|
-> decltype(!Invoke(MoveTemp(Storage), Forward<Types>(Args)...))
|
|
{
|
|
return !Invoke(MoveTemp(Storage), Forward<Types>(Args)...);
|
|
}
|
|
|
|
template <typename... Types> requires CInvocable<const F&, Types&&...>
|
|
constexpr auto operator()(Types&&... Args) const&
|
|
-> decltype(!Invoke(Storage, Forward<Types>(Args)...))
|
|
{
|
|
return !Invoke(Storage, Forward<Types>(Args)...);
|
|
}
|
|
|
|
template <typename... Types> requires CInvocable<const F&&, Types&&...>
|
|
constexpr auto operator()(Types&&... Args) const&&
|
|
-> decltype(!Invoke(MoveTemp(Storage), Forward<Types>(Args)...))
|
|
{
|
|
return !Invoke(MoveTemp(Storage), Forward<Types>(Args)...);
|
|
}
|
|
};
|
|
|
|
NAMESPACE_PRIVATE_END
|
|
|
|
template <typename F>
|
|
constexpr NAMESPACE_PRIVATE::TNotFunction<TDecay<F>> NotFn(F&& Func)
|
|
{
|
|
return NAMESPACE_PRIVATE::TNotFunction<TDecay<F>>(Forward<F>(Func));
|
|
}
|
|
|
|
NAMESPACE_MODULE_END(Utility)
|
|
NAMESPACE_MODULE_END(Redcraft)
|
|
NAMESPACE_REDCRAFT_END
|