Abstract type: Difference between revisions

=={{header|Phix}}==

In many senses the object type is a completely abstract type, since it can hold anything, from native integers to class instances.

You can also have explicitly abstract classes (and/or abstract methods). Needs 0.8.1+

<lang Phix>abstract class job

integer id

-- procedure test(); -- (the ; makes it an abstract method)

procedure show()

printf(1,"this is job:%d\n",id)

end procedure

end class

--job j = new({1}) -- compilation error: "abstract class"

class errand extends job

end class

errand e = new({2})

e.show()</lang>

{{out}}

<pre>

this is job:2

</pre>