throwUnless

inline fun <Ok, Error> Outcome<Ok, Error>.throwUnless(fallbackMessage: (Error) -> String = { "Outcome was Failure and throwUnless predicate was false: $it" }, predicate: (Error) -> Boolean): Outcome<Ok, Error>

Throws if this is a Failure and predicate returns false for the error. Returns the original Outcome unchanged otherwise.

fallbackMessage

Produces the exception message from the error value. Only used when Error is not already a Throwable or nz.adjmunro.outcome.throwable.ThrowableWrapper — in those cases the existing exception is thrown as-is and this parameter is ignored.

predicate

Returns false if the error should be thrown.

The Error itself if it is a Throwable, or its cause if it is a ThrowableWrapper, when predicate returns false.

If the Error is null and predicate returns false.

If the Error is any other non-throwable type and predicate returns false.