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Advanced Programming Techniques in D

alias: Revealing Hidden Names of Superclasses

Explore how name hiding occurs in D programming when subclass functions or variables share names with superclasses. Learn to use alias to access or rename these hidden members, ensuring clear interaction between subclasses and superclasses.

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Revealing hidden names of superclasses

When the same function name appears both in the superclass and in the subclass, the matching names that are in the superclass are hidden. Even a single name in the subclass is sufficient to hide all of the names of the superclass that match that name:

D
class Super {

    void foo(int x) {

    // ...

    } 

}



class Sub : Super {

    void foo() {

    // ...

    } 

}



void main() {

    auto object = new Sub;

    object.foo(42); // ← compilation ERROR

    object.foo(67, 49); // ← compilation ERROR



}

Since the argument is 42, an int value, one might expect that the Super.foo function that takes an int would be called for that ...