pyobject_type.hpp

C++的一个好库。。。现在很流行

// Copyright David Abrahams 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef PYOBJECT_TYPE_DWA2002720_HPP
# define PYOBJECT_TYPE_DWA2002720_HPP

# include <boost/python/cast.hpp>

namespace boost { namespace python { namespace converter { 

BOOST_PYTHON_DECL PyObject* checked_downcast_impl(PyObject*, PyTypeObject*);

// Used as a base class for specializations which need to provide
// Python type checking capability.
template <class Object, PyTypeObject* pytype>
struct pyobject_type
{
    static bool check(PyObject* x)
    {
        return ::PyObject_IsInstance(x, (PyObject*)pytype);
    }

    static Object* checked_downcast(PyObject* x)
    {
        return python::downcast<Object>(
            (checked_downcast_impl)(x, pytype)
            );
    }
};

}}} // namespace boost::python::converter

#endif // PYOBJECT_TYPE_DWA2002720_HPP