[C++-sig] Boost.Python: wrapping a method returning const std::string &

[Olaf Peter]

Bilokon, Paul schrieb:
> Hi c++-sig,
> 
> Sorry if this is supposed to be glaringly obvious, but I thought
> std::string types were pretty much fully supported in Boost.Python
> (looking at Boost 1.35.0).
> 
> I'm trying to wrap a method
> 
>     const std::string& getName( ) const;
> 
> This should be straightforward, right?
> 
> I'm doing it like this:
> 
>     class_<Ccy>("Ccy", init<>())
>         .def("getName", &Ccy::getName)
>     ;
> 
> But in return I'm getting
> 
> Error	6	error C2027: use of undefined type
> 'boost::python::detail::specify_a_return_value_policy_to_wrap_functions_
> returning<T>'
> E:\dev\external\boost\boost_1_35_0\boost\python\detail\caller.hpp
> 223	
> 
> Is this because the string is returned by reference? Do I have to wrap
> the method? If so, I would be very much obliged if you could direct me
> to an example.

Cool compiler error, it says what he expected: see 
http://www.boost.org/doc/libs/1_35_0/libs/python/doc/v2/copy_const_reference.html. 
Please google, why this is you friend.


Regards,
Olaf