"Tim Peters" <[EMAIL PROTECTED]> wrote: [ Many useful answers ]
Thanks very much! That helps. Here are a few points where we are at cross-purposes. I am talking about the C level. What I am thinking of is the standard method of implementing the complicated housekeeping of a class (e.g. inheritance) in Python, and the basic operations in C (for efficiency). The model that I would like to stick to is that the Python layer never knows about the actual object implementation, and the C never knows about the housekeeping. The housekeeping would include the class derivation, which would (inter alia) fix the size of a number. The C code would need to allocate some space to store various constants and workspace, shared between all instances of the derived class. This would be accessible from the object it returns. Each instance would be of a length specified by its derivation (i.e. like Decimal), but would be constant for all members of the class (i.e. not like long). So it would be most similar to tuple in that respect. Operations like addition would copy the pointer to the class data from the arguments, and ones like creation would need to be passed the appropriate class and whatever input data they need. I believe that, using the above approach, it would be possible to achieve good efficiency with very little C - certainly, it has worked in other languages. Regards, Nick Maclaren, University of Cambridge Computing Service, New Museums Site, Pembroke Street, Cambridge CB2 3QH, England. Email: [EMAIL PROTECTED] Tel.: +44 1223 334761 Fax: +44 1223 334679 _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
