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