System.Text.RegularExpressions.RegexFCD.PushFC C# (CSharp) Method

        private void PushFC(RegexFC fc)
        {
            if (_fcDepth >= _fcStack.Length)
            {
                RegexFC[] expanded = new RegexFC[_fcDepth * 2];

                Array.Copy(_fcStack, 0, expanded, 0, _fcDepth);
                _fcStack = expanded;
            }

            _fcStack[_fcDepth++] = fc;
        }