...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
A resolve handler must meet the requirements for a handler.
A value h
of a resolve handler
class should work correctly in the expression h(ec,
i)
,
where ec
is an lvalue of
type const error_code
and i
is an lvalue of type
const ip::basic_resolver_iterator<InternetProtocol>
. InternetProtocol
is the template parameter of the resolver_service
which is used to
initiate the asynchronous operation.