...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 lambda as a signal handler:
my_signal_set.async_wait( [](const boost::system::error_code& ec, int signal_number) { ... });
A non-static class member function adapted to a signal handler using std::bind()
:
void my_class::signal_handler( const boost::system::error_code& ec, int signal_number) { ... } ... my_signal_set.async_wait( std::bind(&my_class::signal_handler, this, std::placeholders::_1, std::placeholders::_2));
A non-static class member function adapted to a signal handler using boost::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));