...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Cancel all asynchronous operations associated with the descriptor.
void cancel( boost::system::error_code & ec);
This function causes all outstanding asynchronous read or write operations
to finish immediately, and the handlers for cancelled operations will
be passed the boost::asio::error::operation_aborted
error.
Set to indicate what error occurred, if any.