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A range connect handler must meet the requirements for a 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.
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));