83 lines
2.2 KiB
Plaintext
83 lines
2.2 KiB
Plaintext
[/
|
|
/ 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:RangeConnectHandler Range connect handler requirements]
|
|
|
|
A range connect handler must meet the requirements for a [link
|
|
boost_asio.reference.Handler handler]. A value `h` of a range connect handler class
|
|
should work correctly in the expression `h(ec, ep)`, where `ec` is an lvalue of
|
|
type `const error_code` and `ep` is an lvalue of the type `Protocol::endpoint`
|
|
for the `Protocol` type in the corresponding `connect()` or async_connect()`
|
|
function.
|
|
|
|
[heading Examples]
|
|
|
|
A free function as a range connect handler:
|
|
|
|
void connect_handler(
|
|
const boost::system::error_code& ec,
|
|
const boost::asio::ip::tcp::endpoint& endpoint)
|
|
{
|
|
...
|
|
}
|
|
|
|
A range connect handler function object:
|
|
|
|
struct connect_handler
|
|
{
|
|
...
|
|
template <typename Range>
|
|
void operator()(
|
|
const boost::system::error_code& ec,
|
|
const boost::asio::ip::tcp::endpoint& endpoint)
|
|
{
|
|
...
|
|
}
|
|
...
|
|
};
|
|
|
|
A lambda as a range connect handler:
|
|
|
|
boost::asio::async_connect(...,
|
|
[](const boost::system::error_code& ec,
|
|
const boost::asio::ip::tcp::endpoint& endpoint)
|
|
{
|
|
...
|
|
});
|
|
|
|
A non-static class member function adapted to a range connect handler using
|
|
`std::bind()`:
|
|
|
|
void my_class::connect_handler(
|
|
const boost::system::error_code& ec,
|
|
const boost::asio::ip::tcp::endpoint& endpoint)
|
|
{
|
|
...
|
|
}
|
|
...
|
|
boost::asio::async_connect(...,
|
|
std::bind(&my_class::connect_handler,
|
|
this, std::placeholders::_1,
|
|
std::placeholders::_2));
|
|
|
|
A non-static class member function adapted to a range connect handler using
|
|
`boost::bind()`:
|
|
|
|
void my_class::connect_handler(
|
|
const boost::system::error_code& ec,
|
|
const boost::asio::ip::tcp::endpoint& endpoint)
|
|
{
|
|
...
|
|
}
|
|
...
|
|
boost::asio::async_connect(...,
|
|
boost::bind(&my_class::connect_handler,
|
|
this, boost::asio::placeholders::error,
|
|
boost::asio::placeholders::endpoint));
|
|
|
|
[endsect]
|