Function clear

src/include/buffer.h:1045–1050

modifiers

    // modifiers
    void clear() noexcept {
      _carriage = &always_empty_bptr;
      _buffers.clear_and_dispose();
      _len = 0;
      _num = 0;
    }
    void push_back(const ptr& bp) {
      if (bp.length() == 0)
	return;