VVMGlobalTrivialEmergentTypePtr.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#if WITH_VERSE_VM || defined(__INTELLISENSE__)
 
#include "VerseVM/VVMContext.h"
#include <atomic>
 
namespace Verse
{
 
struct VCppClassInfo;
struct VEmergentType;
 
struct FGlobalTrivialEmergentTypePtr
{
    FGlobalTrivialEmergentTypePtr() = default;
 
protected:
    VEmergentType& Get(FAllocationContext Context, VCppClassInfo* ClassInfo, bool bWithShape)
    {
        VEmergentType* Result = EmergentType.load(std::memory_order_relaxed);
        std::atomic_signal_fence(std::memory_order_seq_cst);
        if (Result)
        {
            return *Result;
        }
        else
        {
            return GetSlow(Context, ClassInfo, bWithShape);
        }
    }
 
    COREUOBJECT_API VEmergentType& GetSlow(FAllocationContext Context, VCppClassInfo* ClassInfo, bool bWithShape);
 
    std::atomic<VEmergentType*> EmergentType = nullptr;
};
 
template <VCppClassInfo* ClassInfo>
struct TGlobalTrivialEmergentTypePtr : public FGlobalTrivialEmergentTypePtr
{
    TGlobalTrivialEmergentTypePtr() = default;
 
    VEmergentType& Get(FAllocationContext Context, bool bWithShape = false)
    {
        return FGlobalTrivialEmergentTypePtr::Get(Context, ClassInfo, bWithShape);
    }
};
 
} // namespace Verse
#endif // WITH_VERSE_VM