Overriding Constructors

Grzegorz Kraszewski

An object constructor (OM_NEW() method), takes the same message structure opSet as OM_SET() method. The message contains ops_AttrList field, being a pointer to a taglist containing initial object's attributes. Implementation of a constructor for object not chaving child objects is simple. The superclass constructor is called first, then, if it succeeds, the constuructor initializes object instance data, allocates resources needed and sets initial values of attributes from tags passed via ops_AttrList.