You could try assign subclass instances to arrays of it's parent class, as shown in the snippet bellow. It is not a very elegant syntax, but at least it makes your plus(A arg[]) function work like you would expect. best, Casper class A { 42 => int a; fun void print() { <<<a>>>; } } class B extends A { 101 => int b; fun void print() { <<<b>>>; } } fun void plus(A arg[]) { for (0 => int i; i < arg.size() ; i++) { arg[i].a ++; arg[i].print(); } } // first declare the 'container'. A @ foo[2]; // use new operator to create B instances. (new B) @=> foo[0]; (new B) @=> foo[1]; 1 => foo[0].a; 2 => foo[1].a; plus(foo); // notice, foo[0] & foo[1] still behave like a B instance. <<<"foo[0].a", foo[0].a>>>; <<<"foo[1].a", foo[1].a>>>;

1. Inheritance and Arrays (Julien Saint-Martin)

From: Julien Saint-Martin To: chuck-users@lists.cs.princeton.edu Date: 2 januari 2015 16:15:54 CET Reply-To: ChucK Users Mailing List Subject: [chuck-users] Inheritance and Arrays

Hi!

I would like to pass arrays of objects to a function taking an array of parent class as argument. I try different things but unfortunately I have compilation errors each time.

The following example works with no array:

class A { int a; }

class B extends A { int b; }

fun void plus(A arg) { arg.a ++; }

B foo;

1 => foo.a; plus (foo); <<<"foo.a", foo.a>>>;

But When I try the same with arrays it doesn't compile: [l13.ck]:line(22): argument type(s) do not match: [l13.ck]:line(22): ... for function 'plus(...)' ... [l13.ck]:line(22): ...(please check the argument types)

class A { int a; }

class B extends A { int b; }

fun void plus(A arg[]) { for (0 => int i; i < arg.size() ; i++) { arg[i].a ++; }

}

B foo[2];

1 => foo[0].a; 2 => foo[1].a; plus (foo); <<<"foo[0].a", foo[0].a>>>; <<<"foo[1].a", foo[1].a>>>;

Any idea ?

Thanks in advance and Happy new year!!

Julien

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