A customisable converter of ValueOrError<T, E> concept matching types to a returnable failure type.

Overridable: Argument dependent lookup.

Default: A number of implementations are provided by default:

1. try_operation_return_as(T &&) which requires T to provide an .as_failure() member function in order to be available. This is selected for all basic_result and basic_outcome types. See auto try_operation_return_as(T &&).

2. Copy and move editions of try_operation_return_as(std::experimental::expected<T, E>) which return a std::experimental::unexpected<E> for the input’s .error() member function. See std::experimental::unexpected<E> try_operation_return_as(std::experimental::expected<T, E>).

Namespace: BOOST_OUTCOME_V2_NAMESPACE

Header: <boost/outcome/try.hpp>