Method has_input_stream

cpp/fory/util/buffer.h:111–113

  FORY_ALWAYS_INLINE bool own_data() const { return own_data_; }

  FORY_ALWAYS_INLINE bool has_input_stream() const {
    return input_stream_ != nullptr;
  }

  FORY_ALWAYS_INLINE bool has_output_stream() const {
    return output_stream_ != nullptr;