validateEnumValues method

void validateEnumValues(List<num> enumValues)

Validates that the value is one of enumValues — the members of a nameless integer enum, which is generated as a newtype over int. This is its own call rather than a validate argument: an int enum never also carries range bounds, so membership is the only rule. Unlike the range checks, an out-of-set value is a parse failure (the wire carried a value the type does not name), so it throws FormatException to match how a generated fromJson reports malformed input.

Implementation

void validateEnumValues(List<num> enumValues) {
  if (!enumValues.contains(this)) {
    throw FormatException('$this is not one of $enumValues');
  }
}