EntityAllocationIterator.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "EntitySystem/MovieSceneEntitySystemTypes.h"
 
namespace UE
{
namespace MovieScene
{
 
class FEntityManager;
struct FEntityAllocation;
struct FEntityAllocationIterator;
 
using FEntityAllocationIteratorItem = FEntityAllocationProxy;
 
struct FEntityAllocationIterator
{
    MOVIESCENE_API explicit FEntityAllocationIterator(const FEntityManager* InManager);
 
    MOVIESCENE_API explicit FEntityAllocationIterator(const FEntityManager* InManager, const FEntityComponentFilter* InFilter);
 
    MOVIESCENE_API FEntityAllocationIterator(FEntityAllocationIterator&&);
    MOVIESCENE_API FEntityAllocationIterator& operator=(FEntityAllocationIterator&&);
 
    MOVIESCENE_API ~FEntityAllocationIterator();
 
 
    MOVIESCENE_API FEntityAllocationIteratorItem operator*() const;
 
 
    MOVIESCENE_API FEntityAllocationIterator& operator++();
 
 
    MOVIESCENE_API bool operator!=(const FEntityAllocationIterator& Other) const;
 
private:
 
    int32 FindMatchingAllocationStartingAt(int32 Index) const;
 
    const FEntityComponentFilter* Filter;
 
    const FEntityManager* Manager;
 
    int32 AllocationIndex;
};
 
 
struct FEntityAllocationIteratorProxy
{
    FEntityAllocationIteratorProxy(const FEntityManager* InManager, const FEntityComponentFilter* InFilter)
        : Manager(InManager), Filter(InFilter)
    {}
 
    FEntityAllocationIterator begin() const { return FEntityAllocationIterator(Manager, Filter); }
    FEntityAllocationIterator end()  const  { return FEntityAllocationIterator(Manager);         }
 
private:
 
    const FEntityManager* Manager;
    const FEntityComponentFilter* Filter;
};
 
 
} // namespace MovieScene
} // namespace UE