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That, you will have to ask the devs.
The question is however:
what is quicker: wrapping 20 functions manually with copy/paste or trying to
understand boost::python resp. wait for an answer from the devs.
It is my impression, that you have to know a lot about boost::python to
understand why something does not work as it should.
If someone knows the answer, I'd be also be interested, of course ;)
Hans Roessler schrieb:
> Thank you for suggesting the workaround. But I would like to understand _why_
> the operator overloading doesn't work the Boost.Python way in my example (or
> what I have done wrong).
> It can be quite tedious to write a wrapper like __add__ for each operator and
> pair of classes, and I thought the ".def(self <op> other)" syntax was
> implemented for exactly this purpose?
>
> Hans
>
>
>
> ----- Ursprüngliche Mail ----
>> Von: Sebastian Walter <wal...@mathematik.hu-berlin.de>
>> An: Development of Python/C++ integration <cplusplus-sig@python.org>
>> Gesendet: Freitag, den 15. Mai 2009, 11:02:23 Uhr
>> Betreff: Re: [C++-sig] operator+(A, B) without B::B() default constructor in
>> boost.python
>>
> Hans Roessler schrieb:
>
> Hello Hans,
>
> in my experience .def(self+other) often didn't quite do what I expected.
> You could try something like that:
>
> int int__add__A_B(const A &lhs, const B &rhs){
> return operator+(A,B);
> }
>
> .def("__add__", &int__add__A_B)
>
>
> i.e. first define a non-overloaded function int_add__A_B and then bind it to
> __add__ (which is the Python operator+ function).
>
> regards,
> Sebastian
>
>
>>>> Hello,
>>>> how can I wrap the following overloaded operator+ using boost.python?
>>>> The code as is fails with
>>>>> ...
>>>>> pytest.cpp: In function void init_module_pytest():
>>>>> pytest.cpp:19: error: expected primary-expression before ( token
>>>>> ...
>>>> If I try ".def(self+B())" instead of ".def(self+other())", the error is
>>>>> ...
>>>>> pytest.cpp: In function void init_module_pytest():
>>>>> pytest.cpp:17: error: no matching function for call to B::B()
>>>>> ...
>>>> best wishes
>>>> Hans
>>>>
>>>>
>>>> pytest.cpp:
>>>>
>>>> #include
>>>> using namespace boost::python;
>>>>
>>>> class A{
>>>> public:
>>>> };
>>>> class B{
>>>> public:
>>>> B(int i){};
>>>> };
>>>>
>>>> int operator+(const A& a,const B& b){return 42;};
>>>>
>>>> BOOST_PYTHON_MODULE(pytest)
>>>> {
>>>> class_("A")
>>>> .def(self+other()) //.def(self+B()) //line 17
>>>> ;
>>>> class_("B",init) //line 19
>>>> ;
>>>> }
>>>>
>>>>
>>>>
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>>>> Cplusplus-sig@python.org
>>>> http://mail.python.org/mailman/listinfo/cplusplus-sig
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