🐛 Fix broken link to Jamroot in example docs

🐛 Fix broken link to Jamroot in example docs

Conditionally use Py_REFCNT

Conditionally use Py_REFCNT

Make sure to pass C++ version to preprocessor as well.

dynamic_cast before destructor

Call to the destructor ends lifetime of the object, including vptr
used by dynamic_cast.

dynamic_cast before destructor

Call to the destructor ends lifetime of the object, including vptr
used by dynamic_cast.