in reply to Re^8: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
in thread use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20

it'd be nice to have some sort of iteration interface so that we could use for against a collection or generator or iterator or array without having to flatten the values into a list.

Um, neither for my $item ( @array ) { ... } nor ... for @array; flatten?

And for hashes, use ... while (key, value) = each %hash;

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Re^10: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
by chromatic (Archbishop) on Nov 25, 2013 at 21:42 UTC

    Sure, Perl has special ops for non-flattening iteration of arrays and hashes, but it doesn't have an iteration interface so you can't write your own non-flattening iterator.

[reply]

      I guess I am still misunderstanding you because it quite easy and very common to use a sub ref closing over a counter as an iterator for use with while. By way of example, see Algorithm::Combinatorics

      I'm not seeing the difficulty you are alluding to, so perhaps you could clarify for me?

      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.
[reply]
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