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Re^2: perlfunc index name conflict

by syphilis (Chancellor)
on Sep 23, 2012 at 23:09 UTC ( #995268=note: print w/replies, xml ) Need Help??

in reply to Re: perlfunc index name conflict
in thread perlfunc index name conflict

I doubt PDL exports an index function

I expected the same ... but, apparently, not so:
use warnings; use strict; use warnings; use PDL; print index('hello world', 'lo w'), "\n";
This outputs:
Argument "hello world" isn't numeric in subroutine entry at lin +e 7. Argument "lo w" isn't numeric in subroutine entry at line 7. 0
If we comment out the "use PDL;" we then get the expected output of "3".
As Anonymous Monk said, one solution is to use CORE::index() instead of index().
Another solution is to use PDL(); instead of use PDL;

But it's a bit rude of PDL to be exporting this function by default, isn't it ?

Update: The PDL documentation states:
PDL includes about a dozen perl modules that form the core of the language, plus additional modules that add further functionality. The perl module "PDL" loads all of the core modules automatically, making their functions available in the current perl namespace.
Exports "use PDL;" exports a large number of routines into the calling namespace. If you want to avoid namespace pollution, you must instead "use PDL::Lite", and include any additional modules explicitly.
So this *is* documented ... and it seems that the recommended solution is to "use PDL::Lite;".


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[marto]: oddly the last time I was there I saw a zeppelin in flight for the first time
[Corion]: ambrus: I don't know how far the budget estimate has been overrun yet
[Corion]: marto: Heh ;) No, you were likely at Tegel or Schönefeld, the new one ("BER") will be somewhat outside of Berlin ;)
[marto]: Corion Schoenfeld, but my friend has been telling me about this new airport for about 7-8 years now :P
[marto]: I doubt it even exists as a building site :P
[ambrus]: Corion: does building airports "somewhat outside of" a city ever work? cities always grow around the airport quickly, because it's practical to be close to it, and after that, people start to complain that the airplanes land so close to their house and sh
[ambrus]: ould keep down the noise

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