TypedElementRowHandleArrayView.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include <initializer_list>
#include "DataStorage/Handles.h"
#include "Containers/ArrayView.h"
#include "HAL/Platform.h"
#include "Misc/EnumClassFlags.h"
 
namespace UE::Editor::DataStorage
{
    class FRowHandleArrayView
    {
    public:
        enum class EFlags
        {
            None = 0,
            IsSorted = 1 << 0, //< The view is sorted by row handle.
            IsUnique = 1 << 1 //< Every value in the view is guaranteed to appear only once.
        };
 
        FRowHandleArrayView() = default;
        TYPEDELEMENTFRAMEWORK_API FRowHandleArrayView(const RowHandle* Rows UE_LIFETIMEBOUND, int32 RowCount, EFlags Flags);
        TYPEDELEMENTFRAMEWORK_API FRowHandleArrayView(TConstArrayView<RowHandle> Rows, EFlags Flags);
        TYPEDELEMENTFRAMEWORK_API FRowHandleArrayView(std::initializer_list<RowHandle> Rows UE_LIFETIMEBOUND, EFlags Flags);
 
        TYPEDELEMENTFRAMEWORK_API const RowHandle* begin() const;
        TYPEDELEMENTFRAMEWORK_API const RowHandle* end() const;
 
        TYPEDELEMENTFRAMEWORK_API RowHandle operator[](uint32 Index) const;
        TYPEDELEMENTFRAMEWORK_API const RowHandle* GetData() const;
        TYPEDELEMENTFRAMEWORK_API const RowHandle& First() const;
        TYPEDELEMENTFRAMEWORK_API const RowHandle& Last() const;
        TYPEDELEMENTFRAMEWORK_API int32 Num() const;
        TYPEDELEMENTFRAMEWORK_API int32 NumBytes() const;
 
        TYPEDELEMENTFRAMEWORK_API operator TConstArrayView<RowHandle>() const;
 
        TYPEDELEMENTFRAMEWORK_API bool IsSorted() const;
        TYPEDELEMENTFRAMEWORK_API bool IsUnique() const;
        TYPEDELEMENTFRAMEWORK_API bool IsEmpty() const;
 
        TYPEDELEMENTFRAMEWORK_API bool Contains(RowHandle Row) const;
 
    private:
        const RowHandle* Rows = nullptr;
        int32 RowCount = 0;
        bool bIsSorted = false;
        bool bIsUnique = false;
    };
 
    ENUM_CLASS_FLAGS(FRowHandleArrayView::EFlags);
 
} // namespace UE::Editor::DataStorage