How can I extract a wrapped C++ type from a Python type using boost::python?

How can I extract a wrapped C++ type from a Python type using boost::python?

References

Reference NO 1

http://stackoverflow.com/questions/13635790/how-can-i-extract-a-wrapped-c-type-from-a-python-type-using-boostpython

Reference NO 2

http://www.boost.org/libs/python/doc/tutorial/doc/html/python/object.html

Reference NO 3

http://www.boost.org/doc/libs/1_31_0/libs/python/doc/PyConDC_2003/bpl.html

Reference NO 4

http://wiki.python.org/moin/boost.python/HowTo

Reference NO 5

http://www.gps.caltech.edu/~walter/arx/ArX-2.2.4/src/boost/libs/python/doc/tutorial/doc/html/python/object.html

Reference NO 6

http://www.k-3d.org/k3d_wiki/images/8/8b/Extreme_Object_Models_Using_Boost.Python.pdf

Reference NO 7

http://www.murrayc.com/permalink/2010/02/22/glom-1-1314-using-boostpython/

Reference NO 8

https://intermediate-and-advanced-software-carpentry.readthedocs.org/en/latest/c++-wrapping.html