Re: [Pharo-users] why is adding instance variables so slow?

2017-04-12 13:17 GMT+02:00 Guillermo Polito <guillermopolito@gmail.com>:

1) each instance of A is becomed into its corresponding instance of A' 2) finally we become class A into A' This step will make that old instances of A now have: - the old format - but point to the new class A

step 1) ensures that there are no instances of class A anymore. Check following script: c1 := Class1 new. c2 := Class2 new. c1 becomeForward: c2. Class1 allInstances "=> #()". And full migration is executed in high priority uninterrupted process to ensure that between 1) and 2) nobody will instantiate Class1