SomIsInstanceOf

This method determines whether an object is an instance of a specific class. Not generally overridden.

For backward compatibility, this method does not take an Environment parameter.

Original Class

SOMObject

Syntax

boolean somIsInstanceOf (SOMObject receiver, SOMClass aClass)

Parameters

receiver (SOMObject)

A pointer to the object to be tested.

aClass (SOMClass)

A pointer to the class that the object should be an instance of.

Return Code

rc (boolean)

Returns 1 (true) if the receiving object is an instance of the specified class, and 0 (false) otherwise.

Remarks

Use the somIsInstanceOf method to determine if an object is an instance of a specific class. This method tests an object for inclusion in one specific class. It is equivalent to the expression:

(aClass == somGetClass (receiver))

Example Code

#include <dog.h>
/* ----------------------------------
   Note:  Dog is derived from Animal.
   ---------------------------------- */
main()
{
  Animal myAnimal;
  Dog myDog;
  SOMClass animalClass;
  SOMClass dogClass;

  myAnimal = AnimalNew ();
  myDog = DogNew ();
  animalClass = _somGetClass (myAnimal);
  dogClass = _somGetClass (myDog);
  if (_somIsInstanceOf (myDog, animalClass))
     somPrintf ("myDog is an instance of Animal\n");
  if (_somIsInstanceOf (myDog, dogClass))
     somPrintf ("myDog is an instance of Dog\n");
  if (_somIsInstanceOf (myAnimal, animalClass))
     somPrintf ("myAnimal is an instance of Animal\n");
  if (_somIsInstanceOf (myAnimal, dogClass))
     somPrintf ("myAnimal is an instance of Dog\n");
  _somFree (myAnimal);
  _somFree (myDog);
}
/*
Output from this program:
myDog is an instance of Dog
myAnimal is an instance of Animal
*/

Related

Methods

• somDescendedFrom
• somIsA