GuardValueAccessors.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "Templates/Function.h"
 
template <typename AssignedType>
struct TGuardValueAccessors
{
    UE_NONCOPYABLE(TGuardValueAccessors)
 
    [[nodiscard]] explicit TGuardValueAccessors(TFunctionRef<AssignedType()> Getter, TFunction<void(const AssignedType&)>&& InSetter, const AssignedType& NewValue)
        : Setter(MoveTemp(InSetter))
        , OriginalValue(Getter())
    {
        Setter(NewValue);
    }
 
    ~TGuardValueAccessors()
    {
        Setter(OriginalValue);
    }
 
    UE_FORCEINLINE_HINT const AssignedType& GetOriginalValue() const
    {
        return OriginalValue;
    }
private:
    TFunction<void(const AssignedType&)> Setter;
    AssignedType OriginalValue;
};