A customisable integral constant type true for E types constructible from Enum types which are to receive error throwing no-value policies

Overridable: By template specialisation into the trait namespace.

Default: False. Specialisations exist for:

• <boost/outcome/boost_result.hpp>

  • boost::system::error_code to boost::system::is_error_condition_enum<Enum>::value.

• <boost/outcome/std_result.hpp>

  • std::error_code to std::is_error_condition_enum<Enum>::value.

Namespace: BOOST_OUTCOME_V2_NAMESPACE::trait

Header: <boost/outcome/trait.hpp>