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feat(templates): add TReferenceWrapper and the corresponding testing

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This commit is contained in:
_Redstone_c_ 2022-02-09 21:46:39 +08:00
parent ad80dcd78f
commit 2fa4bcea13
4 changed files with 68 additions and 0 deletions
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21
Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp
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@ -9,6 +9,7 @@ NAMESPACE_MODULE_BEGIN(Utility)
void TestTemplates()
{
TestInvoke();
TestReferenceWrapper();
TestMiscellaneous();
}
@ -45,6 +46,26 @@ void TestInvoke()
always_check(TempE == 123);
}
void TestReferenceWrapper()
{
typedef int32(*FuncType)(int32, int32, int32);
FuncType TempA = [](int32 A, int32 B, int32 C) -> int32 { return A * B * C; };
TReferenceWrapper<FuncType> TempB(TempA);
always_check(TempB(1, 1, 1) == 1);
TempB.Get() = &TestFunctionA;
always_check(TempA(1, 1, 1) == 3);
int32 ArrayA[3] = { 1, 2, 3 };
TReferenceWrapper<int32> ArrayB[3] = { ArrayA[1], ArrayA[0], ArrayA[2] };
always_check(ArrayB[0] == 2);
always_check(ArrayB[1] == 1);
always_check(ArrayB[2] == 3);
for (int32& Element : ArrayB) Element *= 2;
always_check(ArrayA[0] == 2);
always_check(ArrayA[1] == 4);
always_check(ArrayA[2] == 6);
}
NAMESPACE_UNNAMED_BEGIN
template <typename T>

45
Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h Normal file
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@ -0,0 +1,45 @@
#pragma once
#include "CoreTypes.h"
#include "Templates/Invoke.h"
#include "Templates/Utility.h"
#include "TypeTraits/TypeTraits.h"
NAMESPACE_REDCRAFT_BEGIN
NAMESPACE_MODULE_BEGIN(Redcraft)
NAMESPACE_MODULE_BEGIN(Utility)
template <typename T>
class TReferenceWrapper
{
public:
using Type = T;
template <typename U> requires !TIsSame<TReferenceWrapper, typename TRemoveCVRef<U>::Type>::Value
constexpr TReferenceWrapper(U&& Object) : Ptr(AddressOf(Forward<U>(Object))) { }
TReferenceWrapper(const TReferenceWrapper&) = default;
TReferenceWrapper& operator=(const TReferenceWrapper& x) = default;
constexpr operator T&() const { return *Ptr; }
constexpr T& Get() const { return *Ptr; }
template <typename... Types>
constexpr TInvokeResult<T&, Types...>::Type operator()(Types&&... Args) const
{
return Invoke(Get(), Forward<Types>(Args)...);
}
private:
T* Ptr;
};
template <typename T>
TReferenceWrapper(T&) -> TReferenceWrapper<T>;
NAMESPACE_MODULE_END(Utility)
NAMESPACE_MODULE_END(Redcraft)
NAMESPACE_REDCRAFT_END

1
Redcraft.Utility/Source/Public/Templates/Templates.h
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@ -5,3 +5,4 @@
#include "Templates/Container.h"
#include "Templates/Noncopyable.h"
#include "Templates/Invoke.h"
#include "Templates/ReferenceWrapper.h"

1
Redcraft.Utility/Source/Public/Testing/TemplatesTesting.h
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@ -8,6 +8,7 @@ NAMESPACE_MODULE_BEGIN(Utility)
void REDCRAFTUTILITY_API TestTemplates();
void REDCRAFTUTILITY_API TestInvoke();
void REDCRAFTUTILITY_API TestReferenceWrapper();
void REDCRAFTUTILITY_API TestMiscellaneous();
NAMESPACE_MODULE_END(Utility)