in reply to Re^6: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
in thread use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20

then somebody calling that function is now able to pass it, instead of a hashref, a blessed object providing the same interface; i.e. polymorphism.

This is an interesting argument. Particularly this bit:

it's not easy to, say, quickly override the order a foreach loop will traverse an array.

Any chance of you knocking up an example for this?

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  • Comment on Re^7: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20

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Re^8: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
by chromatic (Archbishop) on Nov 25, 2013 at 20:05 UTC

    Maybe not changing the traversal order, but 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.

[reply]
[d/l]
      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;

      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]
[d/l]
[select]

        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]

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