...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
A handshake handler must meet the requirements for a handler.
A value h
of a handshake handler class should work correctly
in the expression h(ec)
, where ec
is an lvalue
of type const error_code
.
A free function as a handshake handler:
void handshake_handler( const boost::system::error_code& ec) { ... }
A handshake handler function object:
struct handshake_handler { ... void operator()( const boost::system::error_code& ec) { ... } ... };
A lambda as a handshake handler:
ssl_stream.async_handshake(..., [](const boost::system::error_code& ec) { ... });
A non-static class member function adapted to a handshake handler using
std::bind()
:
void my_class::handshake_handler( const boost::system::error_code& ec) { ... } ... ssl_stream.async_handshake(..., std::bind(&my_class::handshake_handler, this, std::placeholders::_1));
A non-static class member function adapted to a handshake handler using
boost::bind()
:
void my_class::handshake_handler( const boost::system::error_code& ec) { ... } ... ssl_stream.async_handshake(..., boost::bind(&my_class::handshake_handler, this, boost::asio::placeholders::error));