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Re^4: Recap: The Future of Perl 5

by dave_the_m (Monsignor)
on Aug 24, 2018 at 12:09 UTC ( #1221020=note: print w/replies, xml ) Need Help??

in reply to Re^3: Recap: The Future of Perl 5
in thread Recap: The Future of Perl 5

It's built into the perl executable itself:
BEGIN { %Foo::FIELDS = qw(a 1 b 1) }; my Foo $x = {}; $x->{c} = 1; # compile-time error just populates the field hash


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Re^5: Recap: The Future of Perl 5
by tobyink (Abbot) on Aug 24, 2018 at 12:30 UTC

    Interesting. I guess this explains the limitation with Lexical::Types where it allows you to define, say, my Str $x to do something else other than check $x is a blessed Str object (and I've started to explore that possibility using Lexical::TypeTiny), but still requires there to be a Str package defined. I guess Perl needs that package to exist so that it can look for %FIELDS.

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