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Re: Modules: computing a constant, "on load" or in new()?

by AnomalousMonk (Canon)
on Aug 20, 2013 at 22:28 UTC ( #1050259=note: print w/ replies, xml ) Need Help??

in reply to Modules: computing a constant, "on load" or in new()?

What BrowserUk said.
I would look at it slightly differently. If we are talking about a 'class' constant, i.e., something that is invariant over all class and object methods and all 'free' functions of the class, make it a constant as soon as possible, computed or otherwise. If it's an 'object' constant, i.e., something invariant only over the lifetime of a given object, then, of course, it must be somehow created or defined in the constructor: how else? As an example of the first possibility:

package Foo::Bar; ... use constant RX => qr{ hello }xms; ... sub new { ... } ... sub method { my $self = shift; ... if ($self->{bar} =~ RX) { ... } ... } ... 1;

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