Re: Does Curl support override(Not about class inheritance)

[Christopher Barber]

JamesWang wrote:
Hello
Does Curl support method or procedure override?

I can define two procedures with the same name in Curl.Does it mean Curl
does not support that?

  

I am not sure what you mean. 

Curl does not allow two things to use the same name within the same 
package or class (with only a few exceptions for class members: getters 
& setters, primary & secondary constructors, and factories). Curl does 
not support what C++/Java calls "overloading": defining multiple methods 
or functions with the same name but taking different arguments.  Curl 
does support what is usually called "overriding", which is the ability 
to override a superclass's method implementation in a subclass, as in:

{define-class Parent
   {method  {foo}:void
       {do-something}
    }
}

{define-class Child {inherits Parent}
  {method {foo}:void
      {do-something-different}
   }
}

When the 'foo' method is invoked on Child instances, its own version 
will be used instead of that of Parent.

It is possible to mimic the behavior of overloading by defining a macro 
which examines its arguments and determines which implementation to 
dispatch to, but it is usually not worth the trouble.

- Christopher