It will be a problem if you are running under strict. However, if the caller sets up $c as a package variable it will work.
sub map_triples(&@) {
my $f = shift;
my @res;
no strict 'refs';
my $caller = caller;
local(*{$caller."::a"}) = \my $a;
local(*{$caller."::b"}) = \my $b;
local(*{$caller."::c"}) = \my $c;
push @res, $f->($a,$b,$c) while ($a, $b, $c) = splice @_, 0, 3;
return @res;
}
use 5.010;
use warnings;
use strict;
our $c;
say for map_triples { $a + $b + $c } 1..12;
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