问题
What is the difference between:
boost::asio::tcp::socket::async_read_some()boost::asio::tcp::socket::async_receive()
As far as I can tell their documentation is identical.
Which should I prefer?
回答1:
Their specification in the networking TR2 proposal (5.7.10.2 basic_stream_socket members) is identical too:
On async_receive:
Effects: Calls this->service.async_receive(this->implementation, buffers, 0, handler).
On async_read_some:
Effects: Calls this->service.async_receive(this->implementation, buffers, 0, handler).
So I guess this confirms Jerry's impression.
回答2:
I believe the two are essentially identical. The reason they provide both is to provide interfaces similar to both iostreams (which have a read_some member) and sockets (which have a receive).
As Peter Tseng pointed out, async_receive does also have an overload that accepts socket_base::message_flags, which async_read_some does not.
回答3:
Confirming everyone here with two links:
- https://github.com/boostorg/asio/blob/36eef63a9cf8ae609716d76ccb3906ff9769d53a/include/boost/asio/basic_stream_socket.hpp#L558
- https://github.com/boostorg/asio/blob/36eef63a9cf8ae609716d76ccb3906ff9769d53a/include/boost/asio/basic_stream_socket.hpp#L834
The code is exactly the same. However async_receive has one overload with message_flags, which notably allows you to specify asio::socket_base::message_peek.
来源：https://stackoverflow.com/questions/2238166/what-is-the-difference-between-asiotcpsockets-async-read-some-and-async-rec