Class short_transfer

test/write_at.cpp:416–425

}

struct short_transfer
{
  short_transfer() {}
  short_transfer(short_transfer&&) {}
  size_t operator()(const boost::system::error_code& ec,
      size_t /*bytes_transferred*/)
  {
    return !!ec ? 0 : 3;
  }
};

void test_4_arg_const_buffer_write_at()
{