Replace the QString* errorMessage out-parameter with std::expected<RigFormationNames, QString> in RifFormationNamesReader, and propagate the pattern to RimFormationNames::readFormationNamesFile() which now returns std::expected<void, QString>.
Fatal errors (file cannot be opened, FMU line-parse failure) return std::unexpected. Malformed .lyr lines are still skipped so the rest of the file loads, with warnings logged via RiaLogging instead of collected in the out-parameter. RimFormationNamesCollection::readAllFormationNames() now logs errors it previously discarded.
RigCaseCellResultsData and RigFemPartResultsCollection held a raw pointer to RigFormationNames owned by a unique_ptr in RimFormationNames. Reloading or deleting the formation names left the case data with a dangling pointer. Store a copy instead, as RigFormationNames is a small value type with no identity.
Kristian Bendiksen
Magne Sjaastad