Re^3: standard perl routine

Specifying an import list explicitly prevents POSIX from importing anything other than the functions you specify:

c:\test\546536>p1
print scalar keys %main::;; ## Before use POSIX main has how many glob
+als?
67

use POSIX qw[ pow ];;

print scalar keys %main::;; ## and after is has
72
Terminating on signal SIGINT(2)

c:\test\546536>p1
$h{ $_ }++ for keys %main::;; ## Record what we have before

use POSIX qw[ pow ];;

$h{ $_ }++ for keys %main::;; ## Again after

print for grep{ $h{ $_ } == 1 } keys %h;;  ## Display the differences
_<c:/Perl/lib/auto/POSIX/POSIX.dll
XSLoader::
POSIX::
pow
_<POSIX.c
[download]

Two 'private' paths, two new namespaces and one new function (pow) in main.

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Comment on Re^3: standard perl routine Download Code

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Re^4: standard perl routine by davido (Cardinal) on Apr 30, 2006 at 08:03 UTC
Ah, so it does. Good call. The same mechanism that makes `use POSIX ();` (ie, import an empty list) exclude all, also makes `use POSIX qw/pow/;` exclude all others. Dave	[reply] [d/l] [select]