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[/
/ Copyright (c) 2003-2020 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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