RetainedRef.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
template <typename T>
struct TRetainedRef
{
    TRetainedRef(T& InRef)
        : Ref(InRef)
    {
    }
 
    // Can't construct a non-const reference with a const reference
    // and can't retain a rvalue reference.
    TRetainedRef(const T&  InRef) = delete;
    TRetainedRef(      T&& InRef) = delete;
    TRetainedRef(const T&& InRef) = delete;
 
    operator T&() const
    {
        return Ref;
    }
 
    T& Get() const
    {
        return Ref;
    }
 
private:
    T& Ref;
};
 
template <typename T>
struct TRetainedRef<const T>
{
    TRetainedRef(T& InRef)
        : Ref(InRef)
    {
    }
 
    TRetainedRef(const T& InRef)
        : Ref(InRef)
    {
    }
 
    // Can't retain a rvalue reference.
    TRetainedRef(      T&& InRef) = delete;
    TRetainedRef(const T&& InRef) = delete;
 
    operator const T&() const
    {
        return Ref;
    }
 
    const T& Get() const
    {
        return Ref;
    }
 
private:
    const T& Ref;
};