in reply to Re^5: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
in thread use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20

The advantage of autoboxing, is not to make this easier:

my $error = 3.1415927->minus( 22->divide( 7 ) )->abs();

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But rather, if I write a function that deals with $href entirely though method calls rather than the built-in keywords, and document that I have done so, 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 can be achieved somewhat using tied variables, but the interface is very low-level - it's not easy to, say, quickly override the order a foreach loop will traverse an array.

Besides which, in the former example you are hideously breaking encapsulation by using the assignment operator! ;-)

(my $error)->set_value( 3.1415927->minus( 22->divide( 7 ) )->abs() );

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use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name

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Re^7: use feature 'postderef'; # Postfix Dereference Syntax is coming in 5.20
by BrowserUk (Patriarch) on Nov 24, 2013 at 19:25 UTC
    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?

    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.
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      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.

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        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.
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