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+// 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>
+# include <boost/utility.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