25.4 Public and Private Variables

FreeM supports private fields with the :PRIVATE specifier in the SET command, enforcing classical object-oriented data encapsulation. The :PUBLIC specifier is provided for completeness, and is the default.

The below constructor for a FRACTION class defines two private fields:

%FRACTION(THIS,INIT):OBJECT ;
   S THIS("NUMERATOR"):PRIVATE=$P(INIT,"/",1)
   S THIS("DENOMINATOR"):PRIVATE=$P(INIT,"/",2)
   Q

Either of the following commands will create a public field:

  S THIS("VARNAM")="Initial Value"
  S THIS("VARNAM"):PUBLIC="Initial Value"

Attempting to access private fields from outside of the class will raise error condition ZOBJFLDACCV.

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