Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
Um... not quite sure what you're up to here - but it sounds like you're
getting a bit confused between IWorldPart and WorldPart.

What you need is:
interface IWorldPart
class SomeWorldPartSubclass implements IWorldPart

then
var myPart:IWorldPart = new SomeWorldPartSubclass();

should be fine.

_OR_

interface WorldPart
class SomeWorldPartSubclass implements WorldPart

then
var myPart:WorldPart = new SomeWorldPartSubclass();

Not quite sure why your description mentions both IWorldPart and WorldPart -
unless WorldPart implements IWorldPart..? In which case you're looking for:

interface IWorldPart
class WorldPart implements IWorldPart
class SomeWorldPartSubclass extends WorldPart

then either
var myPart:WorldPart = new SomeWorldPartSubclass();
or
var myPart:IWorldPart = new SomeWorldPartSubclass();

should both work...

HTH,
  Ian


On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Hi,
 i'm using a collection, which requires items of type Object to be added.

 I've declared an interface which gives me something like:
 - interface IWorldPart
 - a class implementing WorldPart

 now somewhere else i do:
 var myPart:IWorldPart = new SomeWorldPartSubclass();
 myCollection.addItem (myPart);

 The last statement gives a type error, if i replace the first with var
 myPart:WorldPart = new ... all goes well.

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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Julien Vignali 
Well, you can't instanciate an interface, you need first a concrete 
class that implements the interface...


Your code should be:

interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {}
var myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass();
myCollection.addItem(myPart);

j.c.wichman a écrit :

Hi,
i'm using a collection, which requires items of type Object to be added.
 
I've declared an interface which gives me something like:

- interface IWorldPart
- a class implementing WorldPart
 
now somewhere else i do:

var myPart:IWorldPart = new SomeWorldPartSubclass();
myCollection.addItem (myPart);
 
The last statement gives a type error, if i replace the first with var

myPart:WorldPart = new ... all goes well.
 

From what I can remember from Java (which I admit, seems ages ago ;)), this

first should be no problem at all.
 
Does anyone know why this is not allowed in Flash?
 
thanks in advance.

Hans
 
 
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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Steve Webster 
Well, you can't instanciate an interface, you need first a concrete  
class that implements the interface...


While you cannot instantiate an interface, you can assign an object  
that is an instance of a class that does implement the interface to a  
variable that is typed to the interface.



Your code should be:

interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {}
var myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass();
myCollection.addItem(myPart);


I think what the OP is saying is that he wants to do this (based on  
your example):


var myPart:IWorldPart = new SomeWorldPartSubclass();

...which compiles just fine, but the compiler baulks at the following  
statement...


myCollection.addItem(myPart);

If I read correctly, the addItem method is expecting one argument of  
type Object, and the compiler seems to think that an object of type  
IWorldPart (i.e. of a class implementing the IWorldPart interface)  
cannot be stored in a variable of type Object. I don't have time to  
test this, but if this really is the case then it's a compiler bug.


--
Steve Webster
Head of Development

Featurecreep Ltd.
www.featurecreep.com
14 Orchard Street, Bristol, BS1 5EH
0117 905 5047


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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
No, you can't instantiate an interface. But I don't think Hans was doing
that.

There's no problem with typing:
interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {}
var myPart:IWorldPart = new SomeWorldPartSubclass();   /* Note
INTERFACE-typed var, not concrete */
myCollection.addItem(myPart);

Works fine for me on a quick test. A sanity check of
trace(myPart instanceof Object);  //traces true
shows that you should be able to use the myPart variable everywhere that an
Object is expected.

Ian

On 2/1/06, Julien Vignali [EMAIL PROTECTED] wrote:

 Well, you can't instanciate an interface, you need first a concrete
 class that implements the interface...

 Your code should be:

 interface IWorldPart {}
 class SomeWorldPartSubclass implements IWorldPart  {}
 var myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass();
 myCollection.addItem(myPart);

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RE: [Flashcoders] interfaces and objects

2006-02-01 Thread j.c.wichman 
Hi,
No confusion here ;) except maybe for my fuzzy explanation ;).
I did:
interface IWorldPart
class WorldPart implements IWorldPart
class SomeWorldPartSubclass extends WorldPart

then either
var myPart:WorldPart = new SomeWorldPartSubclass(); or var myPart:IWorldPart
= new SomeWorldPartSubclass();

As you described, however collection.addItem (myPart) only works in the
first case and not in the second.
Probably becoz flash thinks IWorldPart is not an object. I changed it to :
var myPart:Object = new SomeWorldPartSubclass(); 
And it works fine (just as var myPart:WorldPart = new
SomeWorldPartSubclass();) by the way.

Thanks for your comments, 
H

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ian Thomas
Sent: Wednesday, February 01, 2006 12:36 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

Um... not quite sure what you're up to here - but it sounds like you're
getting a bit confused between IWorldPart and WorldPart.

What you need is:
interface IWorldPart
class SomeWorldPartSubclass implements IWorldPart

then
var myPart:IWorldPart = new SomeWorldPartSubclass();

should be fine.

_OR_

interface WorldPart
class SomeWorldPartSubclass implements WorldPart

then
var myPart:WorldPart = new SomeWorldPartSubclass();

Not quite sure why your description mentions both IWorldPart and WorldPart -
unless WorldPart implements IWorldPart..? In which case you're looking for:

interface IWorldPart
class WorldPart implements IWorldPart
class SomeWorldPartSubclass extends WorldPart

then either
var myPart:WorldPart = new SomeWorldPartSubclass(); or var myPart:IWorldPart
= new SomeWorldPartSubclass();

should both work...

HTH,
  Ian


On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Hi,
 i'm using a collection, which requires items of type Object to be added.

 I've declared an interface which gives me something like:
 - interface IWorldPart
 - a class implementing WorldPart

 now somewhere else i do:
 var myPart:IWorldPart = new SomeWorldPartSubclass(); 
 myCollection.addItem (myPart);

 The last statement gives a type error, if i replace the first with var 
 myPart:WorldPart = new ... all goes well.

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RE: [Flashcoders] interfaces and objects

2006-02-01 Thread j.c.wichman 

Hi,
I know u can't instantiate an interface, which wasn’t what I was trying to
do ;), I was declaring a variable to be of type SomeInterface (instantiating
it with SomeConcreteClass), which apparently is not regarded by flash then
of being of type Object as well.
Got it figured out now ;)

Thanks
H
 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Julien
Vignali
Sent: Wednesday, February 01, 2006 12:49 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

Well, you can't instanciate an interface, you need first a concrete class
that implements the interface...

Your code should be:

interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {} var
myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass();
myCollection.addItem(myPart);

j.c.wichman a écrit :
 Hi,
 i'm using a collection, which requires items of type Object to be added.
  
 I've declared an interface which gives me something like:
 - interface IWorldPart
 - a class implementing WorldPart
  
 now somewhere else i do:
 var myPart:IWorldPart = new SomeWorldPartSubclass(); 
 myCollection.addItem (myPart);
  
 The last statement gives a type error, if i replace the first with var 
 myPart:WorldPart = new ... all goes well.
  
From what I can remember from Java (which I admit, seems ages ago ;)), 
this
 first should be no problem at all.
  
 Does anyone know why this is not allowed in Flash?
  
 thanks in advance.
 Hans
  
  
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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
Then as Steve says, sounds like a compiler bug.

Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Hi,
 No confusion here ;) except maybe for my fuzzy explanation ;).
 I did:
 interface IWorldPart
 class WorldPart implements IWorldPart
 class SomeWorldPartSubclass extends WorldPart

 then either
 var myPart:WorldPart = new SomeWorldPartSubclass(); or var
 myPart:IWorldPart
 = new SomeWorldPartSubclass();

 As you described, however collection.addItem (myPart) only works in the
 first case and not in the second.
 Probably becoz flash thinks IWorldPart is not an object. I changed it to :
 var myPart:Object = new SomeWorldPartSubclass();
 And it works fine (just as var myPart:WorldPart = new
 SomeWorldPartSubclass();) by the way.

 Thanks for your comments,
 H

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RE: [Flashcoders] interfaces and objects

2006-02-01 Thread j.c.wichman 
Hi Ian,
Which flash version are you using?
I had other problems yesterday with extending CollectionImpl due to my flash
version (mx 2004), which worked just fine in flash 8. Might be the same in
this case. 

Are you using 7 or 8?

Thanks!
Hans

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ian Thomas
Sent: Wednesday, February 01, 2006 1:05 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

No, you can't instantiate an interface. But I don't think Hans was doing
that.

There's no problem with typing:
interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {}
var myPart:IWorldPart = new SomeWorldPartSubclass();   /* Note
INTERFACE-typed var, not concrete */
myCollection.addItem(myPart);

Works fine for me on a quick test. A sanity check of trace(myPart instanceof
Object);  //traces true shows that you should be able to use the myPart
variable everywhere that an Object is expected.

Ian

On 2/1/06, Julien Vignali [EMAIL PROTECTED] wrote:

 Well, you can't instanciate an interface, you need first a concrete 
 class that implements the interface...

 Your code should be:

 interface IWorldPart {}
 class SomeWorldPartSubclass implements IWorldPart  {} var 
 myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass(); 
 myCollection.addItem(myPart);

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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
But it should. :-)

Like I said, my quick test of
var myPart:SomeInterface=new SomeConcreteImplementingSomeInterface();
trace(myPart instanceof Object);

Traces 'true'. Which is what I'd expect.

I really don't understand why you're getting an error with myCollection.

I know you've solved your immediate problem - but this is niggling at me
now... ;-)

Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:


 Hi,
 I know u can't instantiate an interface, which wasn't what I was trying to
 do ;), I was declaring a variable to be of type SomeInterface
 (instantiating
 it with SomeConcreteClass), which apparently is not regarded by flash then
 of being of type Object as well.
 Got it figured out now ;)

 Thanks
 H

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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Julien Vignali 

Yup, sorry it was my mistake... (I read the message too fast) ;-)

j.c.wichman a écrit :

Hi,
I know u can't instantiate an interface, which wasn’t what I was trying to
do ;), I was declaring a variable to be of type SomeInterface (instantiating
it with SomeConcreteClass), which apparently is not regarded by flash then
of being of type Object as well.
Got it figured out now ;)

Thanks
H
 


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Julien
Vignali
Sent: Wednesday, February 01, 2006 12:49 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

Well, you can't instanciate an interface, you need first a concrete class
that implements the interface...

Your code should be:

interface IWorldPart {}
class SomeWorldPartSubclass implements IWorldPart  {} var
myPart:SomeWorldPartSubclass = new SomeWorldPartSubclass();
myCollection.addItem(myPart);

j.c.wichman a écrit :


Hi,
i'm using a collection, which requires items of type Object to be added.

I've declared an interface which gives me something like:
- interface IWorldPart
- a class implementing WorldPart

now somewhere else i do:
var myPart:IWorldPart = new SomeWorldPartSubclass(); 
myCollection.addItem (myPart);


The last statement gives a type error, if i replace the first with var 
myPart:WorldPart = new ... all goes well.


From what I can remember from Java (which I admit, seems ages ago ;)), 



this


first should be no problem at all.

Does anyone know why this is not allowed in Flash?

thanks in advance.
Hans


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RE: [Flashcoders] interfaces and objects

2006-02-01 Thread j.c.wichman 
Hi,
At me too ;), it's indeed flash 7 compiler bug it seems, it compiles fine in
flash 8.
Time for me to switch ;).

Greetz
Hans

 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ian Thomas
Sent: Wednesday, February 01, 2006 1:22 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

But it should. :-)

Like I said, my quick test of
var myPart:SomeInterface=new SomeConcreteImplementingSomeInterface();
trace(myPart instanceof Object);

Traces 'true'. Which is what I'd expect.

I really don't understand why you're getting an error with myCollection.

I know you've solved your immediate problem - but this is niggling at me
now... ;-)

Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:


 Hi,
 I know u can't instantiate an interface, which wasn't what I was 
 trying to do ;), I was declaring a variable to be of type 
 SomeInterface (instantiating it with SomeConcreteClass), which 
 apparently is not regarded by flash then of being of type Object as 
 well.
 Got it figured out now ;)

 Thanks
 H

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RE: [Flashcoders] interfaces and objects

2006-02-01 Thread j.c.wichman 

Hi,
Yes steve was completely right about that.

Thanks all!
H 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ian Thomas
Sent: Wednesday, February 01, 2006 1:19 PM
To: Flashcoders mailing list
Subject: Re: [Flashcoders] interfaces and objects

Then as Steve says, sounds like a compiler bug.

Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Hi,
 No confusion here ;) except maybe for my fuzzy explanation ;).
 I did:
 interface IWorldPart
 class WorldPart implements IWorldPart
 class SomeWorldPartSubclass extends WorldPart

 then either
 var myPart:WorldPart = new SomeWorldPartSubclass(); or var 
 myPart:IWorldPart = new SomeWorldPartSubclass();

 As you described, however collection.addItem (myPart) only works in 
 the first case and not in the second.
 Probably becoz flash thinks IWorldPart is not an object. I changed it to :
 var myPart:Object = new SomeWorldPartSubclass(); And it works fine 
 (just as var myPart:WorldPart = new
 SomeWorldPartSubclass();) by the way.

 Thanks for your comments,
 H

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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
MX2004

Cheers,
  Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Hi Ian,
 Which flash version are you using?
 I had other problems yesterday with extending CollectionImpl due to my
 flash
 version (mx 2004), which worked just fine in flash 8. Might be the same in
 this case.

 Are you using 7 or 8?

 Thanks!
 Hans

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Re: [Flashcoders] interfaces and objects

2006-02-01 Thread Ian Thomas 
'Fraid not. One to chalk down to experience, I guess. Oh well. I'm making
the move to 8 shortly myself, once this latest crop of projects are out of
the way...

Ian

On 2/1/06, j.c.wichman [EMAIL PROTECTED] wrote:

 Life is so unfair :)

 I had to switch to flash 8 to make it go away... My mind finally at
 piece...
 And now you tell me that it wasn't mx2004 :), please tell me you are a mac
 user ;))

 Greetz
 Hans

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