Hi, On Thu, May 23, 2013 at 12:33 AM, Łukasz Langa <luk...@langa.pl> wrote: > Alternative approaches > ======================
You could also mention "pairtype", used in PyPy: https://bitbucket.org/pypy/pypy/raw/default/rpython/tool/pairtype.py (very short code). It's originally about adding double-dispatch, but the usage that grew out of it is for generic single-dispatch functions that are bound to some common "state" object as follows (Python 2 syntax): class MyRepr(object): ...state of my repr... class __extend__(pairtype(MyRepr, int)): def show((myrepr, x), y): print "hi, I'm the integer %d, arg is %s" % (x, y) class __extend__(pairtype(MyRepr, list)): def show((myrepr, x), y): print "hi, I'm a list" ...use myrepr to control the state... pair(MyRepr(), [2,3,4]).show(42) - Armin _______________________________________________ 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
