[C++-sig] Boost Python loss of values

[Jim Bosch]

On 08/25/2011 04:17 AM, Jay Riley wrote:

>
> And the python exposing is done as follows:
>
> class_<Attack, AttackWrapper, boost::shared_ptr<Attack>, bases<Action>
>  >("Attack")
> .def("CalculateDamage", &AttackWrapper::CalculateDamageDefault);
>

This bit looks a little suspect, and I'm surprised that it compiles - 
class_ should only take 4 arguments if one of them is boost::noncopyable.

I think you mean:

class_< Attack, boost::shared_ptr<AttackWrapper>, bases<Action> >
(...)

See

http://www.boost.org/doc/libs/1_47_0/libs/python/doc/v2/class.html

for details of the arguments to class_.

I don't have a good idea as to why this would cause the problem you're 
seeing (maybe you're slicing your AttackWrapper instances into Attack 
instances?) but I'd recommend fixing it first.

Good Luck!

Jim Bosch