On 3 Nov 2003, Didier Remy wrote:

> It looks similar to the subject/observer pattern.  
> Check Section 5.3 of the OCaml manual as well as my 
> APPSEM course notes
  
It only looks similar...
  
I am working with class _types_ :
This hierarchy is included in a large project, and I need
_readable_ interfaces (as well as _writeable_ :-)

I can't write
"constraint 'a = <an enormous explicit object type as 'b that has
already been written half a dozen times as 'a..>"

Furthermore, my classes _are_ mutually recursive : when I retrieve a   
parent from its child, I want a "full-featured parent" (and vice-versa)
 
damien    
 

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