Handles.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Math/NumericLimits.h"
#include "Templates/TypeHash.h"
 
#include "Handles.generated.h"
 
namespace UE::Editor::DataStorage
{
    using TableHandle = uint64;
    static constexpr TableHandle InvalidTableHandle = TNumericLimits<TableHandle>::Max();
 
    using RowHandle = uint64;
    static constexpr RowHandle InvalidRowHandle = 0;
 
    using QueryHandle = uint64;
    static constexpr QueryHandle InvalidQueryHandle = TNumericLimits<QueryHandle>::Max();
 
    struct FHierarchyHandle
    {
        uint64 Reserved = 0;
    };
} // namespace UE::Editor::DataStorage
 
/*
 * FTedsRowHandle is a strongly typed wrapper around UE::Editor::DataStorage::RowHandle and should only be used in cases where you need the extra info.
 * E.g for reflection/UHT or for template specializing something that needs to know the semantics of the row handle.
 * For all other cases, you should use the regular typedef UE::Editor::DataStorage::RowHandle
 */
USTRUCT()
struct FTedsRowHandle
{
    GENERATED_BODY()
 
    UPROPERTY()
    uint64 RowHandle = UE::Editor::DataStorage::InvalidRowHandle;
 
    operator UE::Editor::DataStorage::RowHandle () const
    {
        return RowHandle;
    }
 
    FTedsRowHandle& operator=(UE::Editor::DataStorage::RowHandle InRowHandle)
    {
        RowHandle = InRowHandle;
        return *this;
    }
 
    bool IsValid() const
    {
        return RowHandle != UE::Editor::DataStorage::InvalidRowHandle;
    }
        
    friend uint32 GetTypeHash(const FTedsRowHandle& Key)
    {
        return GetTypeHash(Key.RowHandle);
    }
};
 
static_assert(sizeof(FTedsRowHandle::RowHandle) == sizeof(UE::Editor::DataStorage::RowHandle), "RowHandle and RowHandle wrapper sizes should match");