[Newbies] Collection>>Includes:...

[stéphane ducasse]

Hi florent

Read K. Beck idiom on redefining = normally you MUST also redefine hash

the pattern Kent suggested was


Book>>= anBook
	(self author = anBook author ) and: [self name = anBook name]

Book>>hash
	self author hash bitXor: self  name hash





Now most of the time I try to use sortedCollection to avoid to have  
to fix the equality of an object,
SortedCollection sortBlock: [:a :b | a name > b name and.....]

On 5 août 06, at 12:56, florent trolat wrote:

> Mathieu a écrit :
>> florent trolat a écrit :
>>
>>> Hi,
>>>
>>> I've define an '=' message for an oject and I want to use this  
>>> object in
>>> a Collection.
>>>
>>> I've seen that 'incudes:' message use '=' or not '==' and it's  
>>> not fun
>>> for me!
>>>
>>> I think that '=' message is to compare two objects and  '==' to  
>>> know if the two object are one!
>>>
>>> So for me 'includes:' must use '==' or not '='...
>>>
>>> May be I have not understand something...
>>>
>>> Thanks to help me....
>>>
>>
>> Hi florent
>>
>> You can do
>>
>> ***********
>> = anObject
>>
>> 	^anObject == self
>>
>> ***********
>>
>> But it is not pretty so the best way is to remove = and the default
>> behavior of = is == (unless inherit from someone else...).
>>
> Ok I understand ... it was my job to see this, sorry...
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