ArchiveSerializedPropertyChain.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
 
struct FArchiveSerializedPropertyChain
{
public:
    FArchiveSerializedPropertyChain()
        : SerializedPropertyChainUpdateCount(0)
#if WITH_EDITORONLY_DATA
        , EditorOnlyPropertyStack(0)
#endif
    {
    }
 
    void PushProperty(class FProperty* InProperty, const bool bIsEditorOnlyProperty)
    {
        check(InProperty);
        SerializedPropertyChain.Push(InProperty);
 
        IncrementUpdateCount();
 
#if WITH_EDITORONLY_DATA
        if (bIsEditorOnlyProperty)
        {
            ++EditorOnlyPropertyStack;
        }
#endif
    }
 
    void PopProperty(class FProperty* InProperty, const bool bIsEditorOnlyProperty)
    {
        check(InProperty);
        check(SerializedPropertyChain.Num() > 0 && SerializedPropertyChain.Last() == InProperty);
        SerializedPropertyChain.Pop(EAllowShrinking::No);
 
        IncrementUpdateCount();
 
#if WITH_EDITORONLY_DATA
        if (bIsEditorOnlyProperty)
        {
            --EditorOnlyPropertyStack;
            check(EditorOnlyPropertyStack >= 0);
        }
#endif
    }
 
    class FProperty* GetPropertyFromStack(const int32 InStackIndex) const
    {
        return SerializedPropertyChain.Last(InStackIndex);
    }
 
    class FProperty* GetPropertyFromRoot(const int32 InRootIndex) const
    {
        return SerializedPropertyChain[InRootIndex];
    }
 
    int32 GetNumProperties() const
    {
        return SerializedPropertyChain.Num();
    }
 
    uint32 GetUpdateCount() const
    {
        return SerializedPropertyChainUpdateCount;
    }
 
    bool HasEditorOnlyProperty() const
    {
#if WITH_EDITORONLY_DATA
        return EditorOnlyPropertyStack > 0;
#else
        return false;
#endif
    }
 
    UE_FORCEINLINE_HINT TArray<class FProperty*, TInlineAllocator<8>>::TConstIterator GetRootIterator() const
    {
        return SerializedPropertyChain.CreateConstIterator();
    }
private:
    void IncrementUpdateCount()
    {
        while (++SerializedPropertyChainUpdateCount == 0) {} // Zero is special, don't allow an overflow to stay at zero
    }
 
    TArray<class FProperty*, TInlineAllocator<8>> SerializedPropertyChain;
 
    uint32 SerializedPropertyChainUpdateCount;
 
#if WITH_EDITORONLY_DATA
    int32 EditorOnlyPropertyStack;
#endif
};