ceph/src/boost/libs/python/include/boost/python/scope.hpp

   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
  12 namespace boost { namespace python {
  13
  14 namespace detail
  15 {
  16   // Making this a namespace-scope variable to avoid Cygwin issues.
  17   // Use a PyObject* to avoid problems with static destruction after Py_Finalize
  18   extern BOOST_PYTHON_DECL PyObject* current_scope;
  19 }
  20
  21 class scope
  22   : public object
  23 {
  24  public:
  25     inline scope(scope const&);
  26     inline scope(object const&);
  27     inline scope();
  28     inline ~scope();
  29
  30  private: // data members
  31     PyObject* m_previous_scope;
  32
  33  private: // unimplemented functions
  34     void operator=(scope const&);
  35 };
  36
  37 inline scope::scope(object const& new_scope)
  38     : object(new_scope)
  39     , m_previous_scope(detail::current_scope)
  40 {
  41     detail::current_scope = python::incref(new_scope.ptr());
  42 }
  43
  44 inline scope::scope()
  45     : object(detail::borrowed_reference(
  46                  detail::current_scope ? detail::current_scope : Py_None
  47                  ))
  48     , m_previous_scope(python::xincref(detail::current_scope))
  49 {
  50 }
  51
  52 inline scope::~scope()
  53 {
  54     python::xdecref(detail::current_scope);
  55     detail::current_scope = m_previous_scope;
  56 }
  57
  58 namespace converter
  59 {
  60   template <>
  61   struct object_manager_traits<scope>
  62       : object_manager_traits<object>
  63   {
  64   };
  65 }
  66
  67 // Placing this after the specialization above suppresses a CWPro8.3 bug
  68 inline scope::scope(scope const& new_scope)
  69     : object(new_scope)
  70     , m_previous_scope(detail::current_scope)
  71 {
  72     detail::current_scope = python::incref(new_scope.ptr());
  73 }
  74
  75 }} // namespace boost::python
  76
  77 #endif // SCOPE_DWA2002724_HPP