Are you sure that your hash is stable (e.g. none of the objects are ever nil)? If the hash changes, the hash table might “loose” entries.

On 24 Dec 2014, at 12:13, Dario Trussardi <dario.trussardi@tiscali.it> wrote:

Ciao,

I wrok into Pharo Pharo1.4 Latest update: #14445

I have a strange behavior relative to hash and = methods into one class.

Sometimes when i do the code aBag occurrencesOf: anItem the system answer 0 but into the bag there's the relative anItem instance.

The problem is generated when in the anItem class definitions method,

i do reference to a instance variable ( consumer ) setting to a Symbol.

The hash method is:

hash

^item hash bitXor:( opzioniVoce hash bitXor:( referenceTime hash bitXor:( consumer hash bitXor:( newEntry hash ))))

The = method is:

= anItem

| rslPrz | anItem ifNil:[^false].

self class = anItem class ifFalse:[ ^false].

rslPrz:= ( item = anItem item and:[ opzioniVoce = anItem opzioniVoce and:[ referenceTime = anItem referenceTime and:[ consumer = anItem consumer and:[ newEntry = anItem newEntry ]]]]).

^ rslPrz

If i remove the consumer instance reference in the two methods all work fine.

any ideas about it ?

Thanks,

Dario