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44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
[/
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/ Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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/
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/ Distributed under the Boost Software License, Version 1.0. (See accompanying
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/ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/]
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[section:reactor Reactor-Style Operations]
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Sometimes a program must be integrated with a third-party library that wants to
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perform the I/O operations itself. To facilitate this, Boost.Asio includes a
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`null_buffers` type that can be used with both read and write operations. A
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`null_buffers` operation doesn't return until the I/O object is "ready" to
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perform the operation.
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As an example, to perform a non-blocking read something like the
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following may be used:
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ip::tcp::socket socket(my_io_service);
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...
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ip::tcp::socket::non_blocking nb(true);
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socket.io_control(nb);
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...
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socket.async_read_some(null_buffers(), read_handler);
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...
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void read_handler(boost::system::error_code ec)
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{
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if (!ec)
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{
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std::vector<char> buf(socket.available());
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socket.read_some(buffer(buf));
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}
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}
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These operations are supported for sockets on all platforms, and for the POSIX
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stream-oriented descriptor classes.
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[heading See Also]
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[link boost_asio.reference.null_buffers null_buffers],
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[link boost_asio.examples.nonblocking nonblocking example].
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[endsect]
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