> > We have a lot of C++ code using a home-grown Event<T> class template. An > > Event<T> is just a list of pointers to callback function objects. More > > precisely, an Event<T> is a std::list<unary_function<T>*>, where > > unary_function is a polymorphic function object class. Code that > > generates an event iterates through the list, dereferences each pointer > > and calls the corresponding function. > > > > I'd like python code to be able to generate these C++ events. To do that > > Event<>s need to support Python's iterable interface, which requires > > random access to the container.Unfortunately, std::list<> doesn't > > support random access. Short of copying the contents of every > > std::list<> to a std::vector<> for Python's benefit I don't see how this > > can be accomplished. > > > > Does anyone have any ideas for a simpler, more natural implementation? > > > > You don't need random access to make a python iterable at all - Python's > built-in dict and set types are examples. All you need to do is define an > __iter__ special function, and you should be able to do that fairly > automatically using the stuff described here: > > http://www.boost.org/doc/libs/1_43_0/libs/python/doc/v2/iterator.html > Jim Bosch
I often refer to this page when I want to add the __iter__ function. It clearly shows all the available options. http://wiki.python.org/moin/boost.python/iterator Add to that boost::make_transform_iterator and possibilities are endless ;) _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
