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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:LegacyCompletionHandler Legacy completion handler requirements]
- A legacy completion handler must meet the requirements for a [link
- boost_asio.reference.Handler handler]. A legacy completion handler must meet the
- requirements of `CopyConstructible` types (C++Std [copyconstructible]). A value
- `h` of a completion handler class should work correctly in the expression
- `h()`.
- [heading Examples]
- A free function as a completion handler:
- void completion_handler()
- {
- ...
- }
- A completion handler function object:
- struct completion_handler
- {
- ...
- void operator()()
- {
- ...
- }
- ...
- };
- A lambda as a completion handler:
- my_io_service.post(
- []()
- {
- ...
- });
- A non-static class member function adapted to a completion handler using
- `std::bind()`:
- void my_class::completion_handler()
- {
- ...
- }
- ...
- my_io_service.post(std::bind(&my_class::completion_handler, this));
- A non-static class member function adapted to a completion handler using
- `boost::bind()`:
- void my_class::completion_handler()
- {
- ...
- }
- ...
- my_io_service.post(boost::bind(&my_class::completion_handler, this));
- [endsect]
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