我在boost.1.50源代码中阅读了asio,方法是什么?
void operator()(const boost::system::error_code& ec,
std::size_t bytes_transferred, int start = 0)
{
switch (start)
{
case 1:
buffers_.prepare(this->check_for_completion(ec, total_transferred_));
for (;;)
{
stream_.async_read_some(buffers_,
BOOST_ASIO_MOVE_CAST(read_op)(*this));
return; default:
total_transferred_ += bytes_transferred;
buffers_.consume(bytes_transferred);
buffers_.prepare(this->check_for_completion(ec, total_transferred_));
if ((!ec && bytes_transferred == 0)
|| buffers_.begin() == buffers_.end())
break;
}
handler_(ec, static_cast<const std::size_t&>(total_transferred_));
}
}
代码是从 boost_1_50_0\boost\asio\impl\read.hpp 中获取的。switch case 样式看起来很奇怪,“return;default:”???