48         private int _index;  field in Google.Protobuf.Buffers.ArrayBufferWriter
59             _index = 0;  in ArrayBufferWriter()
82             _index = 0;  in ArrayBufferWriter()
88         public ReadOnlyMemory<T> WrittenMemory => _buffer.AsMemory(0, _index);
93         public ReadOnlySpan<T> WrittenSpan => _buffer.AsSpan(0, _index);
98         public int WrittenCount => _index;
108         public int FreeCapacity => _buffer.Length - _index;
118             Debug.Assert(_buffer.Length >= _index);  in Clear()
119             _buffer.AsSpan(0, _index).Clear();  in Clear()
120             _index = 0;  in Clear()
140             if (_index > _buffer.Length - count)  in Advance()
143             _index += count;  in Advance()
165             Debug.Assert(_buffer.Length > _index);  in GetMemory()
166             return _buffer.AsMemory(_index);  in GetMemory()
188             Debug.Assert(_buffer.Length > _index);  in GetSpan()
189             return _buffer.AsSpan(_index);  in GetSpan()