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One problem with %HAS is that you have to duplicate the list of attributes.

# type them once... my %field1; my %field2; my %HAS; # type them twice... {$HAS{$_}=1} foreach qw(field1 field2);

As soon as you start typing field1, field2, etc. more than once you give yourself a problem when you change one and forget to change the other, etc.

For example, a typo in %HAS will foul up your new() method without any warnings, etc... and we suddenly start having some of the effects that we switched to inside-out-objects to avoid ;-)

There's also the fact that you don't want the user to fiddle with every attribute in your object.

This leads to the more general point that I don't think that a totally generic object construction subroutine is practical. What ever method you pick is going to be inappropriate/annoy one or more groups of people.

So - don't sweat it! Do something that works for the code that you're writing. Don't worry too much about the platonic one-true-new. There ain't no such beast :-)


In reply to Re^2: Beware can for attrs by adrianh
in thread (my?) problem with re-blessed references(?) by BrowserUk

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