boostpython：包装类和基类之间的参数错误左值

Question

在下面的Python代码中，findFactory返回FactoryBase，而不是FactoryBaseWrapper。
我认为这可能是问题的原因。
你知道如何告诉python FactoryBaseWrapper是从FactoryBase继承的吗？ 我在课堂上试过“基地”这样：

class_<FactoryBaseWrapper, bases<FactoryBase> boost::noncopyable>( "FactoryBase", no_init )

但它不能编译。似乎我也需要从FactoryBase制作接口。但我不能，我需要FactoryBaseWrapper，因为Factorybase中有一个纯虚函数。在

谢谢

Python代码：

^{pr2}$

BoostPython模块：

class_<FactoryMgr, boost::noncopyable>("FactoryMgr",no_init)
  .def("findFactory",&FactoryMgr::findFactory, return_value_policy<reference_existing_object>());

class_<FactoryBaseWrapper, boost::noncopyable>( "FactoryBase", no_init )
.def( "getOrCreateIndicator", &FactoryBaseWrapper::getOrCreateIndicator, return_value_policy<reference_existing_object>())

Cpp函数和类：

        class FactoryMgr
        {    
          FactoryBase* FactoryMgr::findFactory( const std::string& name );
        }
        class FactoryBaseWrapper :public FactoryBase, public wrapper<FactoryBase>
        {
           Base* FactoryBase::getOrCreateBase ( const CustomObject* myObj);
           Base* createBase( string str )
           {
             return this->get_override( "createBase" )();
           }
        } 
        class FactoryBase
        {
           virtual Base* createBase( string str )=0;
           ...
        }

我得到这个错误：

Traceback (most recent call last):
  File "XXX", line 149, in YYYY
_sourceFactory.getOrCreateBase(myObj)
Boost.Python.ArgumentError: Python argument types in
    FactoryBase.getOrCreateBase(FactoryBase, CustomObject)
did not match C++ signature:
    getOrCreateBase(FactoryBaseWrapper {lvalue}, Interface::CustomObject const*)