73 lines
1.6 KiB
Plaintext
73 lines
1.6 KiB
Plaintext
[/
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/ Copyright (c) 2003-2019 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:ConnectHandler Connect handler requirements]
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A connect handler must meet the requirements for a [link
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boost_asio.reference.Handler handler]. A value `h` of a connect handler
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class should work correctly in the expression `h(ec)`, where `ec` is an lvalue
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of type `const error_code`.
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[heading Examples]
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A free function as a connect handler:
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void connect_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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A connect handler function object:
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struct connect_handler
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{
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...
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void operator()(
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const boost::system::error_code& ec)
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{
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...
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}
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...
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};
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A lambda as a connect handler:
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socket.async_connect(...,
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[](const boost::system::error_code& ec)
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{
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...
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});
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A non-static class member function adapted to a connect handler using
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`std::bind()`:
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void my_class::connect_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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...
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socket.async_connect(...,
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std::bind(&my_class::connect_handler,
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this, std::placeholders::_1));
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A non-static class member function adapted to a connect handler using
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`boost::bind()`:
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void my_class::connect_handler(
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const boost::system::error_code& ec)
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{
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...
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}
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...
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socket.async_connect(...,
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boost::bind(&my_class::connect_handler,
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this, boost::asio::placeholders::error));
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[endsect]
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