AddressMatch.AddrSet.GetInstance C# (CSharp) Method

        public static AddrSet GetInstance()
        {
            if (_instance == null)
            {
                lock (SingleInstanceLock)
                {
                    if (_instance == null)
                    {
                        _instance = new AddrSet();
                        return _instance;
                    }
                }
            }

            return _instance;
        }