I removed that in pharo since it was a hack working only on squeak and not even
well because what happens if
I do an alias to self
obj := self.
obj pvt....
or with passing a ref to me around and client invoke the method.
aA foo: self
A>>foo: aA
aA pvt
For people that want to read a nice paper on private methods I suggest:
Encapsulation in a dynamic language by nathanael scharly
=> only self send (using self keywords could be potential
private call) I like the idea and the reasoning behind.
and freezable traits to a certain extent
Stef
>
> Hi
>
> Am 2010-11-02 um 10:24 schrieb eMko:
>> There is a convention of naming private methods - instead of naming it just
>> "methodName" you can use "myMethodName".
>>
>> I have seen this convention in some tutorials at squeak wiki but have not
>> seen a system class in squeak or pharo which uses this. But I do in my
>> programs. A different naming convention of private/protected methods is
>> quite common in other programming or scripting languages like Perl, Python,
>> PHP ...
>
> Incidentally, if you name your method "pvtMethodName" it is expected that
> this message is only sent to self.
>
> So if you have a class
> "--"
> Object subclass: #Foobar
> instanceVariableNames: ''
> classVariableNames: ''
> poolDictionaries: ''
> category: 'TMP'
> "--"
>
> with
> Foobar>>pvtTest
>
> Transcript show: 'Foobar'.
>
> and then do
>
> | a |
> a := Foobar new.
> a pvtTest.
>
> you'll end up with the Compiler telling you
> that “Private messages may only be sent to self”.
>
> However, according to Smalltalk conventions, you should
> use these “private” methods scarcely. In fact, it is easy to
> circumvent this check:
>
> | a |
> a := Foobar new.
> a perform: #pvtTest a Foobar
>
> works easily, so don't rely on the privateness. However,
> whatever one sends to your object is up to her/him and
> she/he is responsible for the outcome ;)
>
> HTH
>
> So Long,
> -Tobias
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