SequentialID.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "SequentialID.generated.h"
 
USTRUCT()
struct FSequentialIDBase
{
    GENERATED_BODY()
 
    FSequentialIDBase() = default;
 
    explicit FSequentialIDBase(uint32 InID) : Value(InID) {}
 
    bool operator==(const FSequentialIDBase& Other) const { return Value == Other.Value; }
    bool operator!=(const FSequentialIDBase& Other) const { return Value != Other.Value; }
 
    bool IsValid() const { return Value != InvalidID; }
    bool IsInvalid() const { return Value == InvalidID; }
 
    void Invalidate() { Value = InvalidID; }
 
    uint32 GetValue() const { return Value; }
 
    FString Describe() const { return FString::Printf(TEXT("Id[%d]"), Value); }
 
    friend uint32 GetTypeHash(const FSequentialIDBase& SequentialID) { return SequentialID.GetValue(); }
 
protected:
    static constexpr uint32 InvalidID = 0;
 
    UPROPERTY()
    uint32 Value = InvalidID;
};