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Re^3: standard perl routine

by BrowserUk (Pope)
on Apr 30, 2006 at 08:01 UTC ( #546564=note: print w/ replies, xml ) Need Help??

in reply to Re^2: standard perl routine
in thread 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

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

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Re^4: standard perl routine
by davido (Archbishop) 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.


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