Cobra Forums

Posted: **Sun Apr 29, 2012 10:28 am**

Hi, is there a casting operator in cobra ?

At the moment, i think i have to do this to pass two ChildClass object to the doSomethingSpecial method

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass
        if b inherits ChildClass
            .doSomethingSpecial(a, b)

when this would be what i do in other languages

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass and b inherits ChildClass
        a = cast a as ChildClass
        b = cast b as ChildClass
        .doSomethingSpecial(a, b)

and this would be the ideal syntax

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass and b inherits ChildClass
        .doSomethingSpecial(a, b)

Is there a better way of doing it ?

Berseker59

Posted: **Sun Apr 29, 2012 2:14 pm**

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass and b inherits ChildClass
        .doSomethingSpecial(a, b)

We almost have the above, but at this time it only works for simple expressions. Therefore, you have to stack them like so:

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass
        if b inherits ChildClass
            .doSomethingSpecial(a, b)

That's called the "if-inherits statement". I do plan on making it support compound expressions at some point in the future.

The casting operating is "to" so you could also write this:

def foo(a as ParentClass, b as ParentClass)
    if a inherits ChildClass and b inherits ChildClass
        .doSomethingSpecial(a to ChildClass, b to ChildClass)

And if it applies to your situation, Cobra has overloading based on argument types (like C#, Java and others):

def foo(a as ParentClass, b as ParentClass)
    print a, b

def foo(a as ChildClass, b as ChildClass)
    print a, b

HTH.

Posted: **Wed May 02, 2012 7:04 pm**

Thanks a lot, that's all i wanted to know

Cobra Forums

Type casting ?

Type casting ?

Re: Type casting ?

Re: Type casting ?