PERL Beginners - use vs. require in modules

Author

use vs. require in modules

Christopher J. Bottaro

2004-08-04, 3:56 pm

i have 4 packages:

PackageA
use IO::File;
require My::Utils::Reader

PackageB
use IO::File;
use XML::Writer;

My::Utils::Reader
use My::Utils;

My::Utils
use Exporter;

in my perl program, i dynamically load PackageA and PackageB like this:

eval("require $package_name1");
eval("require $package_name2");

my question is why does PackageA have to "require My::Utils::Reader" instead
of "use My::Utils::Reader"? PackageB dynamically loads fine and it "uses"
other packages. in fact, every package i list here uses "use" instead of
require. why is there an exception for PackageA and "require
My::Utils::Reader"?

thanks for the help.

Randal L. Schwartz

2004-08-04, 3:56 pm

>>>>> "Christopher" == Christopher J Bottaro <cjbottaro@alumni.cs.utexas.edu> writes:

Christopher> My::Utils
Christopher> use Exporter;

Do you have "@ISA = Exporter" too? Much easier to write this as

use base 'Exporter';

This might be why it needs to be require'd instead of use'd.

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Christopher J. Bottaro

2004-08-04, 8:55 pm

heh, that was it, thanks a bunch.

Randal L. Schwartz wrote:

>
> Christopher> My::Utils
> Christopher> use Exporter;
>
> Do you have "@ISA = Exporter" too? Much easier to write this as
>
> use base 'Exporter';
>
> This might be why it needs to be require'd instead of use'd.
>

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