Re^2: Writing Modules/namespace polution

I believe you should "use Exporter" not "require Exporter"

I believe you should "require Exporter" or "use base 'Exporter'" not "use Exporter".

The exporter module defines &Exporter::import so that it can be inheritied by other modules. Calling Exporter::import('Exporter') doesn't really make sense.

Comment on Re^2: Writing Modules/namespace polution

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Re^3: Writing Modules/namespace polution by dragonchild (Archbishop) on Mar 16, 2005 at 18:13 UTC
Doing a "use Exporter;" will not do anything different than a "require Exporter;" because the import() function in Exporter doesn't do anything because Exporter doesn't define @EXPORT or @EXPORT_OK. The only difference between "use base Exporter;" and either "use Exporter;" or "require Exporter;" is that "use base" will modify @ISA for you and the others make you modify it yourself. You either have to have Exporter in your @ISA or have done something like `*import = \&Exporter::import;` to get the benefits of Exporter. Nothing more, nothing less. Being right, does not endow the right to be rude; politeness costs nothing. Being unknowing, is not the same as being stupid. Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence. Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.	[reply] [d/l]
Re^3: Writing Modules/namespace polution by chas (Priest) on Mar 16, 2005 at 18:26 UTC
Well, I just checked in the Camel books. The 3rd edition does indicate "require Exporter;" in modules, but the 2nd edition (which I learned from) has "use Exporter;" in modules in most of the examples (although there was a "require Exporter;" in an example.) Randal Schwartz's book "Learning Perl Objects, References & Modules" says "...As a module author, all you do is add: `use Exporter; our @ISA = qw(Exporter);` [download] I just made a module skeleton using h2xs, and "require Exporter;" appears in the module file. So maybe either will suffice..I'll go with the "require" form since that's what h2xs produced. chas (Update: Hadn't seen Dragonchild's reply yet - that seems to settle the difference. Fixed typo.)	[reply] [d/l]