Method reset

test/read.cpp:53–61

  }

  void reset(const void* data, size_t length)
  {
    BOOST_ASIO_CHECK(length <= max_length);

    memcpy(data_, data, length);
    length_ = length;
    position_ = 0;
    next_read_length_ = length;
  }

  void next_read_length(size_t length)
  {