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