[C++-sig] call_f(Derived) did not match C++ signature

[Shin-ichi MORITA]

Hi, this is my first post.

I've just started learning Boost.Python.
I want to expose C++ abstract class and function that
receives its instance like this example in the tutorial:

http://boost.org/libs/python/doc/tutorial/doc/class_virtual_functions.html

But I have a problem ...
I compiled this example as module foo and ran test_foo.py
attached to this mail.
Then I had following errors:

====== BEGIN OUTPUT ======
*****************************************************************
Failure in example: foo.call_f(a)
from line #9 of test_foo
Exception raised:
Traceback (most recent call last):
  File "/home/shin/.local/lib/python2.3/doctest.py", line
442, in _run_examples_inner
    compileflags, 1) in globs
  File "<string>", line 1, in ?
ArgumentError: Python argument types in
    foo.call_f(Derived)
did not match C++ signature:
    call_f(Base {lvalue})
*****************************************************************
1 items had failures:
   1 of   4 in test_foo
***Test Failed*** 1 failures.

EXIT STATUS: 1
====== END OUTPUT ======

What's wrong?
Thanks.



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