// 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 SCOPE_DWA2002724_HPP
# define SCOPE_DWA2002724_HPP

# include <boost/python/detail/prefix.hpp>
# include <boost/python/object.hpp>
# include <boost/python/refcount.hpp>

namespace boost { namespace python { 

namespace detail
{
 // Making this a namespace-scope variable to avoid Cygwin issues.
 // Use a PyObject* to avoid problems with static destruction after Py_Finalize
 extern BOOST_PYTHON_DECL PyObject* current_scope;
}

class scope
 : public object
{
 public:
 inline scope(scope const&);
 inline scope(object const&);
 inline scope();
 inline ~scope();
 
 private: // data members
 PyObject* m_previous_scope;

 private: // unimplemented functions
 void operator=(scope const&);
};

inline scope::scope(object const& new_scope)
 : object(new_scope)
 , m_previous_scope(detail::current_scope)
{
 detail::current_scope = python::incref(new_scope.ptr());
}

inline scope::scope()
 : object(detail::borrowed_reference(
 detail::current_scope ? detail::current_scope : Py_None
 ))
 , m_previous_scope(python::xincref(detail::current_scope))
{
}

inline scope::~scope()
{
 python::xdecref(detail::current_scope);
 detail::current_scope = m_previous_scope;
}

namespace converter
{
 template <>
 struct object_manager_traits<scope>
 : object_manager_traits<object>
 {
 };
}

// Placing this after the specialization above suppresses a CWPro8.3 bug
inline scope::scope(scope const& new_scope)
 : object(new_scope)
 , m_previous_scope(detail::current_scope)
{
 detail::current_scope = python::incref(new_scope.ptr());
}

}} // namespace boost::python

#endif // SCOPE_DWA2002724_HPP