1 // Copyright David Abrahams 2002.

     2 // Distributed under the Boost Software License, Version 1.0. (See

     3 // accompanying file LICENSE_1_0.txt or copy at

     4 // http://www.boost.org/LICENSE_1_0.txt)

     5 #ifndef SCOPE_DWA2002724_HPP

     6 # define SCOPE_DWA2002724_HPP

     7 

     8 # include <boost/python/detail/prefix.hpp>

     9 # include <boost/python/object.hpp>

    10 # include <boost/python/refcount.hpp>

    11 # include <boost/utility.hpp>

    12 

    13 namespace boost { namespace python { 

    14 

    15 namespace detail

    16 {

    17   // Making this a namespace-scope variable to avoid Cygwin issues.

    18   // Use a PyObject* to avoid problems with static destruction after Py_Finalize

    19   extern BOOST_PYTHON_DECL PyObject* current_scope;

    20 }

    21 

    22 class scope

    23   : public object

    24 {

    25  public:

    26     inline scope(scope const&);

    27     inline scope(object const&);

    28     inline scope();

    29     inline ~scope();

    30     

    31  private: // data members

    32     PyObject* m_previous_scope;

    33 

    34  private: // unimplemented functions

    35     void operator=(scope const&);

    36 };

    37 

    38 inline scope::scope(object const& new_scope)

    39     : object(new_scope)

    40     , m_previous_scope(detail::current_scope)

    41 {

    42     detail::current_scope = python::incref(new_scope.ptr());

    43 }

    44 

    45 inline scope::scope()

    46     : object(detail::borrowed_reference(

    47                  detail::current_scope ? detail::current_scope : Py_None

    48                  ))

    49     , m_previous_scope(python::xincref(detail::current_scope))

    50 {

    51 }

    52 

    53 inline scope::~scope()

    54 {

    55     python::xdecref(detail::current_scope);

    56     detail::current_scope = m_previous_scope;

    57 }

    58 

    59 namespace converter

    60 {

    61   template <>

    62   struct object_manager_traits<scope>

    63       : object_manager_traits<object>

    64   {

    65   };

    66 }

    67 

    68 // Placing this after the specialization above suppresses a CWPro8.3 bug

    69 inline scope::scope(scope const& new_scope)

    70     : object(new_scope)

    71     , m_previous_scope(detail::current_scope)

    72 {

    73     detail::current_scope = python::incref(new_scope.ptr());

    74 }

    75 

    76 }} // namespace boost::python

    77 

    78 #endif // SCOPE_DWA2002724_HPP