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

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

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Re^3: Moose: using value of one attribute in another attribute by tobyink (Canon) 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'`	[reply] [d/l] [select]
Re^4: Moose: using value of one attribute in another attribute by zwon (Abbot) on Jan 13, 2013 at 06:32 UTC
A simpler alternative to caller would be: `my $private = sub { ... };` [download]	[reply] [d/l]
Re^5: Moose: using value of one attribute in another attribute by tobyink (Canon) on Jan 13, 2013 at 07:10 UTC
True; that slipped my mind (even though I use the technique occasionally). These things are mostly circumventable (Scope::Upper for caller, PadWalker for lexical coderefs, etc), but perhaps the lexical subs coming in Perl 5.18 will be different. `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply]

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