comment on

No, you don't need to worry about that. Libraries can live anywhere. You just want to add:

use lib qw( /path/to/my/libraries/ );
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At the top of your scripts (or in the initialization file for your web server), to tell perl where to look for libraries. Also, don't let the use scare you. It's built on the same mechanism as require, basically, there's just some more tricks involved. One consequence of those differences, though, is that you have to use module-names (where the path-separator is "::" and the path is relative to the library path(s)) with a use statement, whereas with require, you can use either a module-name or a file-name

The two things that are different between use and require are that

use happens at BEGIN-time (that is, as the code is being parsed and compiled, rather than later on as the code is being executed). This means, for example, that:
```
if (0) {
   use Some::Module;
}
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```
will still use the module!
use also automatically calls the import method of whatever module it is loading, and you can specify parameters to that import method after the use statement. (Be careful, though, because since the use is executed earlier than it looks like in the code, passing variables into the import method could cause you hard to understand results... generally just static arguments are passed to the import method this way). For example, look up the page at where I said use lib qw( /path/to/my/libraries/ );, that actually means that lib->import( '/path/to/my/libraries/' ); is getting called (lib being a standard core module for manipulating the directory-path).

This means that use Foo::Bar; is actually equivalent to just:

BEGIN {
   require Foo::Bar;
   Foo::Bar->import();
}
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Of course, if your module doesn't have an import method defined, nothing bad happens, because (since it's a method call, not a function call) it ascends up the class hierarchy to UNIVERSAL::import (...but I'm getting into details, here).

Look at ~~perldoc perlmodlib~~ perldoc perlmod for more info. And good luck!

------------
:Wq
Not an editor command: Wq
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In reply to Re^3: Require or Do vs. more maintenance by etcshadow
in thread Require or Do vs. more maintenance by Stenyj

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