Inheritance/Multiple: Difference between revisions

=={{header|Wren}}==

Wren does not support either multiple inheritance or interfaces.

However, multiple inheritance can be simulated by inheriting from a single class and then embedding objects of other classes and wrapping their methods.

<lang ecmascript>class Camera {

construct new() {}

snap() { System.print("taking a photo") }

}

class Phone {

construct new() {}

call() { System.print("calling home") }

}

class CameraPhone is Camera {

construct new(phone) { _phone = phone } // uses composition for the Phone part

// inherits Camera's snap() method

// Phone's call() method can be wrapped

call() { _phone.call() }

}

var p = Phone.new()

var cp = CameraPhone.new(p)

cp.snap()

cp.call()</lang>

{{out}}

<pre>

taking a photo

calling home

</pre>