[swift-evolution] Overriding computed properties with let constants?

[Adrian Zubarev]

I already see the problem here:

class A { var x: Int { return 42 } }
class B: A { override let x = 7 } // assume that will work
class C: B { override var x: Int { /* wait this wont work anymore */ } }

You won’t be able to override an immutable constant.

I don’t like such a change.

-- 
Adrian Zubarev
Sent with Airmail

Am 23. April 2016 bei 21:19:27, Roman Zhikharevich via swift-evolution (swift-evolution at swift.org) schrieb:

I think, it could be a good idea to make computed properties overridable with let constants.

Something like this:

class Parent {
    var x: Int {
        let x = 42
        /*
         * Compute x...
         */
        return x
    }
}

class Child: Parent {
    /*
     * Sometimes you need to override computed properties with simple constants.
     * This is currently done like this.
     */
    //override var x: Int {return 7}
    
    /*
     * But this looks neater.
     * Currently this gives "error: cannot override with a stored property 'x'".
     */
    override let x = 7
}
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