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Re: Not strict

by diotalevi (Canon)
on May 03, 2003 at 15:10 UTC ( #255329=note: print w/replies, xml ) Need Help??

in reply to Not strict
in thread A Perl aptitude test

When using strict would violate the "once and only once rule". Consider the difference between specifying a whole series of package names versus interpolating something in.

*GPMN::Database::Table::org::pre_insert = *GPMN::Database::Table::user::pre_insert = ..... # repeat for another 15 tables and then do the same for ::pre_up +date for (qw[org user group foo bar]) { no strict 'refs'; *{"GPMN::Database::Table::${_}::pre_insert"} = sub .... *{"GPMN::Database::Table::${_}::pre_update"} = sub .... }

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Re: Re: Not strict
by broquaint (Abbot) on May 03, 2003 at 15:30 UTC
    But that is more laziness than necessity e.g
    use strict; ... $GMPN::Database::Table::{"$_::"}{pre_insert} = sub { ... };
    Really must get around to writing that meditation on how one essentially never needs to turn off strictures.


      That won't work. It has to be
      *{$GMPN::Database::Table::{"$_::"}{pre_insert}} = sub { ... };
      Ok, I need some salt with that foot.

      Makeshifts last the longest.

        Take off your shoes and socks first. Feet are pretty damn salty---trust me on this one. ;-)


      Oh yuck, but that's some really ugly syntax. I'd definately prefer removing strict refs (locally) to using that syntax.

Re^2: Not strict (once and only once)
by Aristotle (Chancellor) on May 04, 2003 at 04:51 UTC
    That is what you call doing it once and only once?
    my $namespace = \%GMPN::Database::Table::; my %inject = ( pre_insert => sub { ... }, pre_update => sub { ... }, ); for my $subpkg (qw[org user group foo bar]) { my ($method, $code); $namespace->{"$subpkg::"}->{$method} = $code while ($method, $code) = each %inject; }

    Makeshifts last the longest.

      Ok, so it was at least better. And thinking back, I initially wrote each glob access many lines apart which didn't lend itself to that expression.

Re: Not strict
by jonadab (Parson) on May 05, 2003 at 02:30 UTC

    That's very similar to a situation I was thinking about, except that I would have stated it more generally: I would consider (locally) using symbolic references in a scenerio when they would be convenient and the risk would be checked by having the complete list of possible values of the reference ennumerated en toto in the code. Additionally, I never bother with strict for very short use-once scripts (e.g., anything I type at the command line after perl -e).

    Truthfully, I don't always use strict in other cases either, but I'm starting to do so more often that I used to do. I'm up to the point of using at the top of all files that get included by another file now, which is progress... and for the record I have yet to see strict catch a mistake that warnings missed, except in a conversation on Perlmonks where a monk contrived an example for me to demonstrate how it could happen. However, the example (though contrived) was sound and I've taken it to heart somewhat.

    And that's why I don't think question 2 as it stands will get the information the test writer actually wants. I would have no trouble explaining the value of strict at this point, but I don't yet have a firm habbit of always using it, which is what the test really wants to know. (The best way to find out? Have 'em write a section of code to do some simple task and see if they declare all of their variables.)

    Actually, my biggest problem with strict is that it doesn't test what I want it to test: whether a subroutine tromps on a (possibly lexical) variable from outside the subroutine. This is for me a *way* more likely scenerio than the ones strict does check.

    {my$c;$ x=sub{++$c}}map{$ \.=$_->()}map{my$a=$_->[1]; sub{$a++ }}sort{_($a->[0 ])<=>_( $b->[0])}map{my@x=(& $x( ),$ _) ;\ @x} split //, "rPcr t lhuJnhea o";print;sub _{ord(shift)*($=-++$^H)%(42-ord("\r"))};

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