On 17 June 2012 15:45, <cplusplus-sig-requ...@python.org> wrote: > Send Cplusplus-sig mailing list submissions to > cplusplus-sig@python.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://mail.python.org/mailman/listinfo/cplusplus-sig > or, via email, send a message with subject or body 'help' to > cplusplus-sig-requ...@python.org > > You can reach the person managing the list at > cplusplus-sig-ow...@python.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Cplusplus-sig digest..." > > > Today's Topics: > > 1. wrapping generic getter/setter functions in boost.python > (vikas chauhan) > 2. Re: wrapping generic getter/setter functions in boost.python > (Jonas Wielicki) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 16 Jun 2012 21:42:56 +0545 > From: vikas chauhan <presentisg...@gmail.com> > To: cplusplus-sig@python.org > Subject: [C++-sig] wrapping generic getter/setter functions in > boost.python > Message-ID: > <cag2q8sbd4cgeh9gx9mnj6xyaretp5vql_wutfo6aiqnzcpr...@mail.gmail.com > > > Content-Type: text/plain; charset="iso-8859-1" > > Hi all, > I am pretty new to boost.python and I have been getting some problems > wrapping generic getter/setter functions. > Say for eg. we have class like this. > > class X{ > int a[10]; > public: > int geta(int index) throw(some_exception) { > if(index >= 10 || index <0) > throw some_exception; > return a[index]; > } > void seta(int index, int val) throw(some_exception) { > if(index >= 10 || index < 0) > throw some_exception; > a[index] = value; > } > }; > > I want to add attributes like a0, a1, a2,.. a9 in my python class, wherein > a0 corresponds to a[0] , a1 to a[1] and likewise. > In the boost.python docs ( exposing Class properties ), getter/settter > functions are documented for single value only. > Is it possible to do what I want ( i.e add separate attributes using the > single geta()/seta() functions ) or I need to write some kind of wrapper > functions (each for accessing each a[i]) ? > > i.e, what I want to do is something like this. > > BOOST_PYTHON_MODULE(mymod) > { > using namespace boost::python; > > class_<X>("X") > .add_property("a0", &X::geta, &X::seta) > .add_property("a1", &X::geta, &X::seta) > .. > .. > ; > } > > and passing the arguments to geta ( i.e 0, 1,.. etc ) in someway. > > So, basically what I want is , to avoid unnecessary code bloat. > > regards, > vikas > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mail.python.org/pipermail/cplusplus-sig/attachments/20120616/53a515d4/attachment-0001.html > > > > ------------------------------ > > Message: 2 > Date: Sat, 16 Jun 2012 18:14:34 +0200 > From: Jonas Wielicki <j.wieli...@sotecware.net> > To: Development of Python/C++ integration <cplusplus-sig@python.org> > Subject: Re: [C++-sig] wrapping generic getter/setter functions in > boost.python > Message-ID: <4fdcb0ea.3000...@sotecware.net> > Content-Type: text/plain; charset=UTF-8 > > On 16.06.2012 17:57, vikas chauhan wrote: > > Is it possible to do what I want ( i.e add separate attributes using the > > single geta()/seta() functions ) or I need to write some kind of wrapper > > functions (each for accessing each a[i]) ? > I guess the simplest way to do that is to template the geta and seta > function similar to this one: > > class X { > template <int index> > int geta() throw(foo) { > return a[index]; > } > // ... > } > > you then somehow need to force instanciation I guess, maybe a plain > > // ... > .add_property("a0", &X::geta<0>) > > does the trick, but I doubt it. This just as a suggestion for a > direction to do research in, I did not try it, neither I would bet that > it works ;) > > cheers, > Jonas > > > ------------------------------ > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > > End of Cplusplus-sig Digest, Vol 45, Issue 15 > ********************************************* >
Hi Jonas, thanks a lot for your suggestions. It actually worked !! cheers, vikas
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