Cobra Forums

Posted: **Thu Jan 15, 2009 10:08 am**

Or uint.minValue, or any other property of that kind. I can easily find a work around, so this is not an urgent thing.

Posted: **Thu Jan 15, 2009 12:42 pm**

One more thing. How do I test if a dynamic object is > 0?

I've tried the following but it fails at runtime (ArgumentException):

class Program

    def isPositive(x as dynamic) as bool is shared
         return x > 0

    def main is shared
        print .isPositive(3f)

Posted: **Thu Jan 15, 2009 1:03 pm**

One more thing. Hope this doesn't get annoying.

Is is normal that the following fails to compile?

extend String
    def func1
        pass
        
extend String
    def func2
        pass
        
class Program
    def main is shared
        pass

Apparently, the second time "extend String" appears, Cobra generates some boiler plate code in which a name clashes with the code it had generated during the first "extend String". I have a workaround for this too (you guessed it, combine to both "extends" into a single one). But I thought it might be interesting to report it nevertheless.

Posted: **Thu Jan 15, 2009 1:52 pm**

Ultimately, the Cobra run-time for "x > 0" is invoking:

(a to IComparable).compareTo(b)

And it is System.Double.CompareTo that is choking on the integer. I wish it wouldn't. I've enhanced the code to promote the integer when needed and checked in the fix.

Regarding your "extend" problem, I was aware of it, but just hadn't gotten to fixing that yet. Sorry you ran into it.

No annoyances here. I need to hear about all problems so they can be fixed and locked out with test cases.

Posted: **Thu Jan 15, 2009 2:00 pm**

Thanks for answering. Did you read my first question, the one about uint.minValue?

BTW I have the Prompt class mostly sorted out. I'll post it here tomorrow. I've made some bold design decisions, I'm eager to see what everyone thinks about them.

Posted: **Thu Jan 15, 2009 4:35 pm**

I think I found another bug:

class G<of T>

    var myT as T
    
class Program

    var g = G<of int?>()
        
    def main is shared
        p = Program()

This triggers a runtime assertion, complaining that myT is nil. It is as if the compiler did not realize that T is taking the value int?, and that therefore "myT" should be allowed to be nil.

Posted: **Fri Jan 16, 2009 3:24 am**

Chuck wrote:I've enhanced the code to promote the integer when needed and checked in the fix.

Thanks. Is there another way to obtain a zero converted to the type of "x"?

I'm thinking of something along the lines of:

def isPositive(x as dynamic) as bool is shared
     zero = 0 to x.type
     return x > zero

Posted: **Fri Jan 16, 2009 3:25 am**

jonathandavid wrote:I think I found another bug:
class G<of T>

    var myT as T
    

class Program

    var g = G<of int?>()
        
    def main is shared
        p = Program()
This triggers a runtime assertion, complaining that myT is nil. It is as if the compiler did not realize that T is taking the value int?, and that therefore "myT" should be allowed to be nil.

Looks like a bug. Can you add a ticket?

Posted: **Fri Jan 16, 2009 3:28 am**

jonathandavid wrote:
Chuck wrote:I've enhanced the code to promote the integer when needed and checked in the fix.

Thanks. Is there another way to obtain a zero converted to the type of "x"?

I'm thinking of something along the lines of:
def isPositive(x as dynamic) as bool is shared
     zero = 0 to x.type
     return x > zero

Yes, .NET comes with a Convert utility class. You can say:

Convert.changeType(0, x.getType)

Although for your specific example, there's no benefit as Cobra will now do this for you when dealing with dynamic values.

Also, dynamic is the default type for arguments so you can just say:

def foo(a, b) ...

if you like.

Posted: **Tue Jan 27, 2009 4:09 am**

Chuck wrote:Looks like a bug. Can you add a ticket?

Added. I've also added another one for the int.maxValue issue.

Cobra Forums

cannot use int.maxValue

cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue

Re: cannot use int.maxValue