NetIDVariant.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Iris/ReplicationSystem/NetRefHandle.h"
#include "Misc/NetworkGuid.h"
#include "Misc/TVariant.h"
#include "Templates/TypeHash.h"
 
class FArchive;
 
namespace UE::Net
{
 
class FNetIDVariant
{
public:
    struct FEmptyID {};
 
    using FVariantType = TVariant<FEmptyID, FNetworkGUID, FNetRefHandle>;
 
    FNetIDVariant() = default;
 
    explicit ENGINE_API FNetIDVariant(FNetworkGUID NetGUID);
    explicit ENGINE_API FNetIDVariant(FNetRefHandle NetRefHandle);
 
    friend ENGINE_API FArchive& operator<<(FArchive& Ar, FNetIDVariant& NetID);
 
    bool ENGINE_API IsValid() const;
 
    FVariantType GetVariant() const
    {
        return Variant;
    }
 
    bool ENGINE_API operator==(const FNetIDVariant& RHS) const;
 
    ENGINE_API FString ToString() const;
 
private:
    FVariantType Variant;
};
 
inline uint32 GetTypeHash(const FNetIDVariant& NetID)
{
    // Assuming the internal index of TVariant is uint8 (which it is) even though the public API uses SIZE_T
    uint8 TypeIndex = static_cast<uint8>(NetID.GetVariant().GetIndex());
 
    uint32 IDHash = 0;
    if (NetID.GetVariant().IsType<FNetworkGUID>())
    {
        IDHash = GetTypeHash(NetID.GetVariant().Get<FNetworkGUID>());
    }
    else if (NetID.GetVariant().IsType<FNetRefHandle>())
    {
        IDHash = GetTypeHash(NetID.GetVariant().Get<FNetRefHandle>());
    }
 
    return HashCombineFast(TypeIndex, IDHash);
}
 
}