VVMWeakCellMap.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#if WITH_VERSE_VM || defined(__INTELLISENSE__)
 
#include "Containers/Map.h"
#include "CoreTypes.h"
#include "VVMCell.h"
#include "VVMGlobalTrivialEmergentTypePtr.h"
 
namespace Verse
{
 
struct VWeakCellMap : VCell
{
    DECLARE_DERIVED_VCPPCLASSINFO(COREUOBJECT_API, VCell);
    COREUOBJECT_API static TGlobalTrivialEmergentTypePtr<&StaticCppClassInfo> GlobalTrivialEmergentType;
 
    static VWeakCellMap& New(FAllocationContext Context)
    {
        return *new (Context.Allocate(FHeap::DestructorAndCensusSpace, sizeof(VWeakCellMap))) VWeakCellMap(Context);
    }
 
    COREUOBJECT_API VCell* Find(FAccessContext Context, VCell* Key);
    COREUOBJECT_API void Add(FAccessContext Context, VCell* Key, VCell* Value);
    COREUOBJECT_API void Remove(VCell* Key);
    template <typename FunctorType> // FunctorType is (VCell*,VCell*) -> void
    void ForEach(FunctorType&& Functor);
 
    // This function is a test-only function because it has a very limited kind of meaning. Requesting the size (or
    // checking the emptiness) of a weak map gives a kind of upper bound: it means that the map has at most this many
    // entries. But we cannot tell you which of those entries are real. When you query them, you are likely to find
    // fewer entries.
    bool IsEmpty() const { return Map.IsEmpty(); }
 
    size_t GetAllocatedSize() const
    {
        return Map.GetAllocatedSize();
    }
 
private:
    COREUOBJECT_API VWeakCellMap(FAllocationContext Context);
    COREUOBJECT_API ~VWeakCellMap();
 
    COREUOBJECT_API void ConductCensusImpl();
 
    TMap<VCell*, VCell*> Map;
};
 
} // namespace Verse
#endif // WITH_VERSE_VM