Enumerations#

An enumeration definition is a kind of attribute definition whose instances are limited to specific set of enumerated values.

An enumeration usage is an attribute usage that is required to have a single definition that is an enumeration definition.

Mapping to C++#

Enumerations are mapped to an C++ enum class with a type as defined by the parameter ‘EnumBaseTypeForEvents’.

Example#

SysML v2 source code:

  // definition of events accepted by a state machine
  enum def StatefulPartEvent {
    //@StatefulPart
    ev1;
    ev2;
    ev3;
  }

C++ source code:

enum class StatefulPartEvent : std::int16_t {
  None = 0, // sentinel for "no value"
  ev1,
  ev2,
  ev3
};