On request of a colleague I was playing around with an own implementation of switch as replacement for given/when

Surprisingly, I can use next within a sub to be able to fall thru to the next case, which leads to a nice syntax.

    
use strict;
use warnings;
use diagnostics;


sub switch {
    no warnings 'exiting';
    while (@_) {
        my ($case, $action) = splice @_,0,2;
        return $action->($case) if $_ ~~ $case;
    }
}


#no warnings 'exiting';

switch
  [1,2,3] => sub { print "bla" ; next},
  3       => sub { print "bla2" }
  for (3);

[download]

But I'm getting

Exiting subroutine via next at d:/Users/RolfLangsdorf/pm/switch.pl lin
+e 18 (#1)
    (W exiting) You are exiting a subroutine by unconventional means, 
+such
    as a goto, or a loop control statement.

[download]

Obviously I can't dynamically disable the warning, because it's lexically scoped.

Uncommenting the #no warnings 'exiting' works, but would be acting for a much wider scope.

Question:

Is it possible to disable a certain warning in the dynamic scope?

Overwriting the warn handler does the trick ...

local $SIG{__WARN__} = sub { warn "$_[0]" unless $_[0] =~ /^Exiting subroutine via next/ } ;

... , but maybe there is a cleaner solution?

NB: this is experimental code and not meant for production! :)

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Wikisyntax for the Monastery

In reply to Disabling runtime warnings in dynamic scope? by LanX

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