Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit f112abfb5a.
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Reactor-Style Operations

Sometimes a program must be integrated with a third-party library that wants to perform the I/O operations itself. To facilitate this, Boost.Asio includes synchronous and asynchronous operations that may be used to wait for a socket to become ready to read, ready to write, or to have a pending error condition.

As an example, to perform a non-blocking read something like the following may be used:

ip::tcp::socket socket(my_io_context);
...
socket.non_blocking(true);
...
socket.async_wait(ip::tcp::socket::wait_read, read_handler);
...
void read_handler(boost::system::error_code ec)
{
  if (!ec)
  {
    std::vector<char> buf(socket.available());
    socket.read_some(buffer(buf));
  }
}

These operations are supported for sockets on all platforms, and for the POSIX stream-oriented descriptor classes.

See Also

basic_socket::wait(), basic_socket::async_wait(), basic_socket::non_blocking(), basic_socket::native_non_blocking(), nonblocking example.


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