Re: How many times is Foo::Bar loaded?

A use is a complicated require which is a complicated "do file" which is a complicated eval.

As you easily see from the documentation every used file.pm is only evaled once and import() ~~is only called once~~ is called each time to drag the listed symbols into the current namespace.

Cheers Rolf

( addicted to the Perl Programming Language)

update

corrected import part, thx corion. =)

Comment on Re: How many times is Foo::Bar loaded?

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Re^2: How many times is Foo::Bar loaded? by Corion (Patriarch) on Apr 09, 2013 at 19:33 UTC
Actually, `->import()` is called for every `use` statement. The `eval` part only happens once.	[reply] [d/l] [select]
Re^3: How many times is Foo::Bar loaded? by LanX (Saint) on Apr 09, 2013 at 19:36 UTC
Off course, makes sense since the import-list can change... Cheers Rolf ( addicted to the Perl Programming Language)	[reply]
Re^4: How many times is Foo::Bar loaded? by dsheroh (Monsignor) on Apr 10, 2013 at 09:11 UTC
Not just because the import list can change... The more important reason for doing the `->import()` step every time is that a Perl program can be spread across many files (modules or otherwise) and those files can define many namespaces, each of which may need to import symbols from the same module. If `->import()` was only called the first time, then only the first namespace to `use` the module would import its symbols and any other namespaces which expected them to be available would fail. And fail in very-difficult-to-debug ways, since the failure would be dependent on which files are loaded and in what order.	[reply] [d/l] [select]
Re^4: How many times is Foo::Bar loaded? by Anonymous Monk on Apr 09, 2013 at 19:58 UTC
Thank you all, that was very helpful	[reply]