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Re^2: Moose: using value of one attribute in another attribute

by mimosinnet (Sexton)
on Jan 12, 2013 at 10:57 UTC ( #1013029=note: print w/ replies, xml ) Need Help??


in reply to Re: Moose: using value of one attribute in another attribute
in thread Moose: using value of one attribute in another attribute

Thanks very much for you clear and detailed answer! A good insight on how objects work! It is also very enlightening to understand your example on how to read the contents of the file. Also, I was not aware of the use of the underscore to make attributes and builders private!


Comment on Re^2: Moose: using value of one attribute in another attribute
Re^3: Moose: using value of one attribute in another attribute
by tobyink (Abbot) on Jan 12, 2013 at 13:32 UTC

    Perl doesn't have true private methods. Underscores are merely a convention to indicate that a sub is intended for internal use only.

    It is possible to create do-it-yourself private subs by checking caller within a sub and then calling die if the caller is outside your module. Though this will have a performance impact if you do it a lot, and is of questionable benefit.

    perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

      A simpler alternative to caller would be:

      my $private = sub { ... };

        True; that slipped my mind (even though I use the technique occasionally). These things are mostly circumventable (Scope::Upper for caller, PadWalker for lexical coderefs, etc), but perhaps the lexical subs coming in Perl 5.18 will be different.

        perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

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