System.Text.RegularExpressions.RegexWriter.PushInt C# (CSharp) Method

        private void PushInt(int i)
        {
            if (_depth >= _intStack.Length)
            {
                int[] expanded = new int[_depth * 2];

                Array.Copy(_intStack, 0, expanded, 0, _depth);

                _intStack = expanded;
            }

            _intStack[_depth++] = i;
        }