82 lines
2.1 KiB
Plaintext
82 lines
2.1 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:IteratorConnectHandler Iterator connect handler requirements]
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An iterator connect handler must meet the requirements for a [link
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boost_asio.reference.Handler handler]. A value `h` of an iterator connect handler
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class should work correctly in the expression `h(ec, i)`, where `ec` is an
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lvalue of type `const error_code` and `i` is an lvalue of the type `Iterator`
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used in the corresponding `connect()` or async_connect()` function.
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[heading Examples]
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A free function as an iterator connect handler:
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void connect_handler(
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const boost::system::error_code& ec,
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boost::asio::ip::tcp::resolver::iterator iterator)
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{
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...
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}
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An iterator connect handler function object:
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struct connect_handler
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{
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...
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template <typename Iterator>
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void operator()(
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const boost::system::error_code& ec,
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Iterator iterator)
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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 an iterator connect handler:
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boost::asio::async_connect(...,
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[](const boost::system::error_code& ec,
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boost::asio::ip::tcp::resolver::iterator iterator)
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{
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...
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});
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A non-static class member function adapted to an iterator 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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boost::asio::ip::tcp::resolver::iterator iterator)
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{
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...
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}
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...
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boost::asio::async_connect(...,
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std::bind(&my_class::connect_handler,
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this, std::placeholders::_1,
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std::placeholders::_2));
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A non-static class member function adapted to an iterator 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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boost::asio::ip::tcp::resolver::iterator iterator)
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{
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...
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}
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...
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boost::asio::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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boost::asio::placeholders::iterator));
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[endsect]
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