in reply to Getting a list of aliases to selected items from a list of array references
sub map_With_Ref { my( $sub )= shift( @_ ); &$sub( map { \$_->[0] } @_ ); # ^^^^^^^^^^^^^^^^^^ Here is the selection code } sub map_With_Closure { my( $sub )= shift( @_ ); my @closures; foreach my $aref(@_){ push @closures, sub :lvalue{ $aref->[0] }; } &$sub( @closures ); # I had trouble attempting to dynamically build the equivalent of +the # @closures array using the "map {BLOCK}" syntax - apparently that # conflicts with lvalue subs. } my @a= ( 1..3 ); my @b= ( 4..6 ); my @c= ( 7..9 ); sub addten_Ref { $$_ += 10 for @_ } sub addten_With_Closure { &$_() += 10 for @_ } print "--- REF test --\n"; map_With_Ref( \&addten_Ref, \@a, \@b, \@c ); map_With_Ref( sub { print "$$_\n" for @_ }, \@a, \@b, \@c ); print "--- Closure test --\n" ; map_With_Closure( \&addten_With_Closure, \@a, \@b, \@c ); map_With_Closure( sub { print &$_() . "\n" for @_ }, \@a, \@b, \@c );
If anyone is successful in enclosing the lvalue sub inside a "map" statement, I'd love to see the code.################### --Output -- --- REF test -- 11 14 17 --- Closure test -- 21 24 27
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