#! perl -slw
use strict;
sub nFor(&@) {
my $code = shift;
die "First argument must be a code ref" unless ref( $code ) eq 'CO
+DE';
my @limits = @_;
my @indices = ( 0 ) x @limits;
for( my $i = $#limits; $i >= 0; ) {
$i = $#limits;
$code->( @indices ), ++$indices[ $i ]
while $indices[ $i ] < $limits[ $i ];
$i = $#limits;
$indices[ $i ] = 0, ++$indices[ --$i ]
while $i >= 0 and $indices[ $i ] == $limits[ $i ];
}
}
my @array = (
[ "a", "b", "c", ],
[ "1", "2", "3", "4", ],
[ "x", "y", ],
);
nFor {
print join '', map $array[ $_ ][ $_[ $_ ] ], 0 .. $#_
} map scalar @$_, @array;
__END__
c:\test>nfor
a1x
a1y
a2x
a2y
a3x
a3y
a4x
a4y
b1x
b1y
b2x
b2y
b3x
b3y
b4x
b4y
c1x
c1y
c2x
c2y
c3x
c3y
c4x
c4y
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