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Re: underscore prototype imposing scalar context

by BrowserUk (Patriarch)
on Mar 10, 2012 at 01:31 UTC ( [id://958821]=note: print w/replies, xml ) Need Help??


in reply to underscore prototype imposing scalar context

Does this help?

sub x(@;_) { print @_ ? @_ : $_ };; $_ = 'fred'; x();; fred $_ = 'fred'; x( 1 .. 5 );; 1 2 3 4 5 $_ = 'fred'; x( 1 );; 1

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

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Re^2: underscore prototype imposing scalar context
by Aaronrp (Scribe) on Mar 10, 2012 at 20:21 UTC

    No, that doesn't work. The unbackslashed @ eats up all the prototype characters behind it.

    This:

    #!/ActivePerl/bin/perl use 5.014; use warnings; sub sayit (@;_); sayit (1, 2, 3); my @list = (4, 5, 6); sayit (@list); local $_ = 7; sayit; my $_ = 8; sayit; sub sayit (@;_) { my @list = @_; if (@list) { say "@list" } else { say "no list" } }

    yields this:

    Prototype after '@' for main::sayit : @;_ at q.pl line 6. Prototype after '@' for main::sayit : @;_ at q.pl line 21. 1 2 3 4 5 6 no list no list

    The first two lines are due to the warnings pragma.

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