Re^2: Class data scope?

Well, actually I'm just really trying to get it right in my head. I'm not exactly trying to do anything.

If I have Class wide data (as oposed to Object instance data),..

Let's say we have package House, our 'script1' instances 5 House and each House has an address, etc. Class House keeps track that there are 5 houses open.

If two process are run of script1, does Class House register 10 House or 5 House???

Does this change if user X and user Z both run script1 at the same time?

I'm guessing the 'scope' of the Class data is only good for the process. Regardless of user, multiple process etc.

Comment on Re^2: Class data scope?

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Re^3: Class data scope? by psini (Deacon) on Jun 12, 2008 at 18:58 UTC
You're guessing right. In Perl there is (usually) no data in common between multiple executing copies of a script. If you need to share one or more vars between different copies of a script you have to do that explicitly by mean of shared memory or other IPC methods. But I'm really really sure I understand what you mean with "class data". My best guess is that you mean a global var defined in the package containing the class and then yes, AFAIK any method of any object derived from that class has access to the global var which is unique for the entire script (but not unique across several executions of it) Careful with that hash Eugene.	[reply]
Re^3: Class data scope? by ikegami (Patriarch) on Jun 12, 2008 at 19:03 UTC
Class House keeps track that there are 5 houses open. Are you assuming Perl does this? No language I know does this. If two process are run of script1, does Class House register 10 House or 5 House??? If the class has code to do this, it depends on that code. It seems to me that you're asking question based on unfounded assumptions. Classes are package names into which objects are blessed. Period. Everything else is up to you.	[reply]