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