ObjectPtrLinkedListBuilder.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/LinkedListBuilder.h"
#include "UObject/ObjectPtr.h"
 
template<typename InElementType>
struct TObjectPtrLinkedListBuilderNextLink
{
    using ElementType = InElementType;
 
    [[nodiscard]] UE_FORCEINLINE_HINT static auto GetNextPtr(ElementType& Element)
    {
        return &(Element.Next);
    }
};
 
template<typename InElementType, typename InLinkAccessor = TObjectPtrLinkedListBuilderNextLink<InElementType>>
struct TObjectPtrLinkedListBuilder : public TLinkedListBuilderBase<InElementType, TObjectPtr<InElementType>, InLinkAccessor>
{
    using Super = TLinkedListBuilderBase<InElementType, TObjectPtr<InElementType>, InLinkAccessor>;
    using ElementType = Super::ElementType;
    using PointerType = Super::PointerType;
    using Super::Super;
 
    UE_NONCOPYABLE(TObjectPtrLinkedListBuilder);
 
    // Allow construction from raw ptr because call sites were handling the type mismatch between
    // the head and next ptrs in lists by converting the TObjectPtr to a raw ptr with MutableView.
    [[nodiscard]] explicit TObjectPtrLinkedListBuilder(ElementType** ListStartPtr)
        : Super(reinterpret_cast<PointerType*>(ListStartPtr))
    {
    }
};