[C++-sig] pyste, patch to allow injecting code in class definition

[Baptiste Lepilleur]

    The attached patch allows the user to inject code in the class
definition code, just like declaration_code() & module_code(). Among other
things, this allows us to add properties when  pyste support fail (anonymous
union...).

    Example of usage:

Vector3 = Class( "Ogre::Vector3", "OgreVector3.h" )

class_code( Vector3, '.def_readwrite( "x", &Ogre::Vector3::x )' )

class_code( Vector3, '.def_readwrite( "y", &Ogre::Vector3::y )' )

class_code( Vector3, '.def_readwrite( "z", &Ogre::Vector3::z )' )


    Which produces:

class_< Ogre::Vector3 >("Vector3", init< >())

    .def(init< Ogre::Real, Ogre::Real, Ogre::Real >())

    .def_readwrite( "x", &Ogre::Vector3::x )

    .def_readwrite( "y", &Ogre::Vector3::y )

    .def_readwrite( "z", &Ogre::Vector3::z )

    ;

    Baptiste.
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