Enum Cardinality Path C++ Link Google.Protobuf.WellKnownTypes.Field.Types.Cardinality, Google.Protobuf underlying int32 Google.Protobuf.dll Values 4 NameValueHex Unknown00x00Optional10x01Required20x02Repeated30x03 Used by 1types with a member, parameter or interface of this type Field // Google.Protobuf.WellKnownTypes.Field.Types.Cardinality, Google.Protobuf enum class Cardinality : int32 { Unknown = 0, Optional = 1, Required = 2, Repeated = 3, };