Policy class defining that hard undefined behaviour should occur on incorrect narrow and wide value, error or exception observation.

Inherits publicly from base , and simply defines its wide value, error and exception observer policies to call their corresponding narrow editions.

Included by <basic_result.hpp>, and so is always available when basic_result is available.

Requires: Nothing.

Namespace: BOOST_OUTCOME_V2_NAMESPACE::policy

Header: <boost/outcome/policy/all_narrow.hpp>