Re: how do modules work?

[Andrew Gaffney]

I completely understand the way the Perl's namespaces work. Here is what confused me. In 
my module, I created a function that connects to a MySQL database and then returns a DB 
handle. In the script that receives the DB handle, I removed the 'use DBI;' line. I can 
make queries against the database without problems. Why does this work?

[EMAIL PROTECTED] wrote:
That would be true in some languages. Not in Perl. Modules only "exist" in 
the lexical scope (usually a block, in this case a file/package). So, there's no 
danger in polluting namespace from that module for sure. But, as with 
everything else in Perl, you can access it if you go out of your way. 

So, if you use Data::Dumper in the Foo::Bar class, and you call the Foo::Bar 
class (via use Foo::Bar), you'd have to do &Foo::Bar::Dumper to use it. If you 
understand. Which you probably don't. So wait until someone else answers. :-)

Will

In a message dated 2/17/2004 7:21:35 PM Eastern Standard Time, 
[EMAIL PROTECTED] writes:
I've been using Perl for about a year. I'm writing my own module that 
contains some custom 
functions that I use a lot. In doing this, I started wondering how modules 
work. For 
example, if my module has 'use SomeModule;' and a script I write has 'use 
MyModule;', does 
that mean that I am effectively saying 'use SomeModule;' in my script?



--
Andrew Gaffney
Network Administrator
Skyline Aeronautics, LLC.
636-357-1548
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