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3rdparty/boost_1_81_0/boost/python/scope.hpp 1.83 KB
dbf9e800   Hu Chunming   提交_GLIBCXX_USE_CX...
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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>
  
  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