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- [/
- / Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- /
- / Distributed under the Boost Software License, Version 1.0. (See accompanying
- / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- /]
- [section:other_protocols Support for Other Protocols]
- Support for other socket protocols (such as Bluetooth or IRCOMM sockets) can be
- added by implementing the [link boost_asio.reference.Protocol protocol type
- requirements]. However, in many cases these protocols may also be used with
- Boost.Asio's generic protocol support. For this, Boost.Asio provides the following four
- classes:
-
- * [link boost_asio.reference.generic__datagram_protocol `generic::datagram_protocol`]
- * [link boost_asio.reference.generic__raw_protocol `generic::raw_protocol`]
- * [link boost_asio.reference.generic__seq_packet_protocol `generic::seq_packet_protocol`]
- * [link boost_asio.reference.generic__stream_protocol `generic::stream_protocol`]
-
- These classes implement the [link boost_asio.reference.Protocol protocol type
- requirements], but allow the user to specify the address family (e.g. `AF_INET`)
- and protocol type (e.g. `IPPROTO_TCP`) at runtime. For example:
- boost::asio::generic::stream_protocol::socket my_socket(my_io_context);
- my_socket.open(boost::asio::generic::stream_protocol(AF_INET, IPPROTO_TCP));
- ...
- An endpoint class template, [link boost_asio.reference.generic__basic_endpoint
- `boost::asio::generic::basic_endpoint`], is included to support these protocol
- classes. This endpoint can hold any other endpoint type, provided its native
- representation fits into a `sockaddr_storage` object. This class will also
- convert from other types that implement the [link boost_asio.reference.Endpoint
- endpoint] type requirements:
- boost::asio::ip::tcp::endpoint my_endpoint1 = ...;
- boost::asio::generic::stream_protocol::endpoint my_endpoint2(my_endpoint1);
- The conversion is implicit, so as to support the following use cases:
- boost::asio::generic::stream_protocol::socket my_socket(my_io_context);
- boost::asio::ip::tcp::endpoint my_endpoint = ...;
- my_socket.connect(my_endpoint);
- [heading C++11 Move Construction]
-
- When using C++11, it is possible to perform move construction from a socket (or
- acceptor) object to convert to the more generic protocol's socket (or acceptor)
- type. If the protocol conversion is valid:
- Protocol1 p1 = ...;
- Protocol2 p2(p1);
- then the corresponding socket conversion is allowed:
- Protocol1::socket my_socket1(my_io_context);
- ...
- Protocol2::socket my_socket2(std::move(my_socket1));
- For example, one possible conversion is from a TCP socket to a generic
- stream-oriented socket:
- boost::asio::ip::tcp::socket my_socket1(my_io_context);
- ...
- boost::asio::generic::stream_protocol::socket my_socket2(std::move(my_socket1));
- These conversions are also available for move-assignment.
- These conversions are not limited to the above generic protocol classes.
- User-defined protocols may take advantage of this feature by similarly ensuring
- the conversion from `Protocol1` to `Protocol2` is valid, as above.
- [heading Accepting Generic Sockets]
- As a convenience, a socket acceptor's `accept()` and `async_accept()` functions
- can directly accept into a different protocol's socket type, provided the
- corresponding protocol conversion is valid. For example, the following is
- supported because the protocol `boost::asio::ip::tcp` is convertible to
- `boost::asio::generic::stream_protocol`:
- boost::asio::ip::tcp::acceptor my_acceptor(my_io_context);
- ...
- boost::asio::generic::stream_protocol::socket my_socket(my_io_context);
- my_acceptor.accept(my_socket);
- [heading See Also]
- [link boost_asio.reference.generic__datagram_protocol `generic::datagram_protocol`],
- [link boost_asio.reference.generic__raw_protocol `generic::raw_protocol`],
- [link boost_asio.reference.generic__seq_packet_protocol `generic::seq_packet_protocol`],
- [link boost_asio.reference.generic__stream_protocol `generic::stream_protocol`],
- [link boost_asio.reference.Protocol protocol type requirements].
- [endsect]
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