...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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));