When building a class, the somBuildClass function is responsible for registering the procedure that will be executed when this method is invoked on the class. The default procedure registered by somBuildClass uses the SOMMalloc function, but the IDL modifier somallocate can be used in the SOM IDL class implementation section to indicate a different procedure. Users of this method should be sure to use the dual method, somDeallocate, to free allocated storage. Also, if the IDL modifier somallocate is used to indicate a special allocation routine, the IDL modifier somdeallocate should be used to indicate a dual procedure to be called when the somDeallocate method is invoked.