MaterialRecursionGuard.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    MaterialShared.h: Shared material definitions.
=============================================================================*/
 
#pragma once
 
template<typename T>
struct TMaterialRecursionGuard
{
    inline TMaterialRecursionGuard() = default;
    inline TMaterialRecursionGuard(const TMaterialRecursionGuard& Parent)
        : Value(nullptr)
        , PreviousLink(&Parent)
    {
    }
 
    inline void Set(const T* InValue)
    {
        check(Value == nullptr);
        Value = InValue;
    }
 
    inline bool Contains(const T* InValue)
    {
        TMaterialRecursionGuard const* Link = this;
        do
        {
            if (Link->Value == InValue)
            {
                return true;
            }
            Link = Link->PreviousLink;
        } while (Link);
        return false;
    }
 
private:
    const T* Value = nullptr;
    TMaterialRecursionGuard const* PreviousLink = nullptr;
};