Team

class ATeamInfo
{
public:
    int32 Index;
    bool IsAMember(AController* Controller) const;
    void AddMember(AController* Controller);
    void RemoveMemberController* Controller);
};

class AMyGameState
{
public:
    Tarray<ATeamInfo*> TeamInfoList;

    int32 GetControllerTeamIndex(AController* Controller) const
    {
        for (ATeamInfo* teamInfo : TeamInfoList)
        {
            if (teamInfo->IsAMember(Controller))
            {
                return teamInfo->Index;
            }
        }
        return INDEX_NONE;
    }
};

class AMyPlayerController
{
public:
    int32 GetTeamIndex()
    {
        AMyGameState* gameState = CastChecked<AMyGameState>(GetWorld()->GetGameState());
        return gameState->GetControllerTeamIndex(this);
    }
};