VVMAux.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Misc/AssertionMacros.h"
 
#if WITH_VERSE_VM || defined(__INTELLISENSE__)
 
namespace Verse
{
 
// This struct is just a pointer wrapper to be used when you want to allocate `Aux` memory.
// Aux memory is marked but not put on the MarkStack like VCells and we wrap Aux pointers in this
// so TWriteBarrier/TWeakBarrier can know to mark its `Ptr` as Aux.
template <typename T>
class TAux
{
protected:
    T* Ptr;
 
public:
    TAux()
        : Ptr(nullptr) {}
    TAux(void* InPtr)
        : Ptr(static_cast<T*>(InPtr)) {}
 
    T* GetPtr() { return Ptr; }
 
    explicit operator bool() const { return !!(Ptr); }
 
    T& operator*()
    {
        check(Ptr);
        return *Ptr;
    };
    T* operator->()
    {
        check(Ptr);
        return Ptr;
    };
    T& operator[](size_t Index)
    {
        return Ptr[Index];
    }
};
 
template <>
class TAux<void>
{
protected:
    void* Ptr;
 
public:
    TAux()
        : Ptr(nullptr) {}
    TAux(void* InPtr)
        : Ptr(InPtr) {}
 
    void* GetPtr() { return Ptr; }
 
    explicit operator bool() const { return !!(Ptr); }
};
 
template <typename T>
constexpr inline bool IsTAux = false;
 
template <typename T>
constexpr inline bool IsTAux<TAux<T>> = true;
 
struct VBuffer;
template <>
constexpr inline bool IsTAux<VBuffer> = true;
 
} // namespace Verse
#endif // WITH_VERSE_VM