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Re: Are user-defined private methods possible? [message #67201 is a reply to message #67199]

Wed, 08 July 2009 11:56

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Wed, 8 Jul 2009, Paul van Delst wrote:

> As the subject states, are user-defined private methods possible in IDL?
>
> I have some object methods that I want to be private to the class (like Init
> and Cleanup) but I can't find any info on how to do that in the IDL help.
> Once the methods in question are invoked (and, thus, compiled) in a public
> method, they're accessible from outside the class.

You can not prevent calls to your "private" methods, but you can check
whether the caller is a method of your class or not:

; cut here, copy to test.pro and .ru test
;
pro o::private
catch, stranger
if stranger ne 0 then $
begin
catch, /cancel
goto, prn
endif

if not obj_isa((scope_varfetch('self', level=-1)), 'o') then stranger=1

prn:
if stranger ne 0 then print, 'private call failed' $
else print, 'private call succeeded'
end

pro o::public
self->private
end

s={o, i:0}
o=obj_new('o')
print, 'calling private from class method:'
o->public
print, 'calling private directly:'
o->private
end

; cut here

regards,
lajos

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[Message index]

		Re: Are user-defined private methods possible? By: Oliver on Fri, 10 July 2009 01:33
		Re: Are user-defined private methods possible? By: Paul Van Delst[1] on Wed, 08 July 2009 12:17
		Re: Are user-defined private methods possible? By: Paul Van Delst[1] on Wed, 08 July 2009 12:16
		Re: Are user-defined private methods possible? By: Foldy Lajos on Wed, 08 July 2009 11:56
		Re: Are user-defined private methods possible? By: David Fanning on Wed, 08 July 2009 10:59

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