79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
#pragma once
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#include "CoreTypes.h"
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#include "Templates/Tuple.h"
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#include "Templates/Utility.h"
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#include "Memory/PointerTraits.h"
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#include "Templates/Noncopyable.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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NAMESPACE_PRIVATE_BEGIN
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template <typename RT, typename ST>
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using TRawPointer = TConditional<CVoid<RT>, typename TPointerTraits<TRemoveCVRef<ST>>::ElementType*, RT>;
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template <bool bEnableInput, typename RT, typename ST, typename... Ts>
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class FInOutPtr final : private FSingleton
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{
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public:
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explicit FInOutPtr(ST& InPtr, Ts&&... Args) requires (!bEnableInput)
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: SPointer(InPtr), Tuple(nullptr, Forward<Ts>(Args)...)
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{ }
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explicit FInOutPtr(ST& InPtr, Ts&&... Args) requires (bEnableInput)
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: SPointer(InPtr), Tuple(InPtr.Release(), Forward<Ts>(Args)...)
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{ }
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~FInOutPtr()
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{
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if constexpr (requires(RT* RPtr, ST& SPtr, Ts&&... Args) { SPtr.Reset(RPtr, Forward<Ts>(Args)...); })
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{
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Tuple.Apply([this](Ts&&... Args) { SPointer.Reset(Forward<Ts>(Args)...); });
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}
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else if constexpr (CConstructibleFrom<ST, RT, Ts...> && CMoveAssignable<ST>)
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{
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SPointer = Tuple.template Construct<ST>();
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}
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else check_no_entry();
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}
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operator RT*() { return &Tuple.First; }
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operator void**() requires (!CSameAs<void*, RT>) { return &Tuple.First; }
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private:
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ST& SPointer;
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TTuple< RT, Ts&&...> Tuple;
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};
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NAMESPACE_PRIVATE_END
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template <typename RT = void, typename ST, typename... Ts> requires ((CVoid<RT>) || (CPointer<RT>)
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&& (requires(NAMESPACE_PRIVATE::TRawPointer<RT, ST>* RPtr, ST& SPtr, Ts&&... Args) { SPtr.Reset(RPtr, Forward<Ts>(Args)...); })
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|| (CConstructibleFrom<ST, NAMESPACE_PRIVATE::TRawPointer<RT, ST>, Ts...> && CMoveAssignable<ST>)
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&& requires { typename TPointerTraits<TRemoveCV<ST>>::ElementType; })
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auto OutPtr(ST& InPtr, Ts&&... Args)
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{
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return NAMESPACE_PRIVATE::FInOutPtr<false, NAMESPACE_PRIVATE::TRawPointer<RT, ST>, ST, Ts...>(InPtr, Forward<Ts>(Args)...);
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}
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template <typename RT = void, typename ST, typename... Ts> requires ((CVoid<RT>) || (CPointer<RT>)
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&& (requires(NAMESPACE_PRIVATE::TRawPointer<RT, ST>* RPtr, ST& SPtr, Ts&&... Args) { SPtr.Reset(RPtr, Forward<Ts>(Args)...); })
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|| (CConstructibleFrom<ST, NAMESPACE_PRIVATE::TRawPointer<RT, ST>, Ts...> && CMoveAssignable<ST>)
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&& requires(ST& SPtr) { { SPtr.Release() } -> CConvertibleTo<NAMESPACE_PRIVATE::TRawPointer<RT, ST>>; }
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&& requires { typename TPointerTraits<TRemoveCV<ST>>::ElementType; })
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auto InOutPtr(ST& InPtr, Ts&&... Args)
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{
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return NAMESPACE_PRIVATE::FInOutPtr<true, NAMESPACE_PRIVATE::TRawPointer<RT, ST>, ST, Ts...>(InPtr, Forward<Ts>(Args)...);
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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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