Redcraft/Redcraft.Utility/Source/Public/Templates/ReferenceWrapper.h

51 lines
1.3 KiB
C++

#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>;
template <typename T> struct TUnwrapReference { using Type = T; };
template <typename T> struct TUnwrapReference<TReferenceWrapper<T>> { using Type = T&; };
template <typename T> struct TUnwrapRefDecay { using Type = typename TUnwrapReference<typename TDecay<T>::Type>::Type; };
NAMESPACE_MODULE_END(Utility)
NAMESPACE_MODULE_END(Redcraft)
NAMESPACE_REDCRAFT_END