[C++-sig] Wrapping std::vector<AbstractClass*>

Joel de Guzman djowel at gmail.com
Thu Jul 7 16:07:03 CEST 2005

Joel de Guzman wrote:
> Paul Melis wrote:
>>I have an abstract class and a std::vector<> of pointers to this class. 
>>A routine in my c++ code fills a vector with objects of classes derived 
>>from the abstract class.
>>I'd like to iterate over the vector in python and use each of the items 
>>in the vector depending on the type of derived class.
> [...]
>>I suspect that boost.python will wrap the return value of returnList() 
>>as a pointer to Abstract, without the possibility at runtime to look at 
>>the actual object type. Is this something I would have to code by hand? 
>>For example, by making a routine that takes a pointer to Abstract and 
>>uses dynamic_cast<> to test which of the concrete classes the object 
>>actually is from?
> Pardon the delay. It's been a while. I'm investigating the problem
> in more detail. I'll get back to you on this, ok?

Ok... Replying to myself...

I committed a fix. The problem occurs when lst[0] tries to return
a copy and there's no way to provide a call policy. So, the
behavior now is for wrapped containers of pointers to always
return by internal reference.

Joel de Guzman

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