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class casting

arjuny

Hi,

In SV LRM in the section "class casting" the following statement is given.

LRM statement: "It is always legal to assign a subclass variable to a variable of a class higher in the inheritance tree. It is never legal to directly assign a superclass variable to a variable of one of its subclasses. However, it is legal to assign a superclass handle to a subclass variable if the superclass handle refers to an object of the given subclass."

Can any body please give examples for the above statements.

Thanks, Arjun.

Parents
  • class A; endclass class B extends A; endclass class C extends A; endclass B b_obj = new(); A a_obj; a_obj = b_obj; // legal B is also a type A b_obj = a_obj; // illegal could be B type but could also be A or C types $cast( b_obj, a_obj ); // sets b_obj iff a_obj points to a B type object
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  • class A; endclass class B extends A; endclass class C extends A; endclass B b_obj = new(); A a_obj; a_obj = b_obj; // legal B is also a type A b_obj = a_obj; // illegal could be B type but could also be A or C types $cast( b_obj, a_obj ); // sets b_obj iff a_obj points to a B type object
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