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

   1 // Copyright David Abrahams 2003.
   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 DEF_VISITOR_DWA2003810_HPP
   6 # define DEF_VISITOR_DWA2003810_HPP
   7
   8 # include <boost/python/detail/prefix.hpp>
   9 # include <boost/detail/workaround.hpp>
  10
  11 namespace boost { namespace python {
  12
  13 template <class DerivedVisitor> class def_visitor;
  14 template <class T, class X1, class X2, class X3> class class_;
  15
  16 class def_visitor_access
  17 {
  18 # if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \
  19     || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
  20     // Tasteless as this may seem, making all members public allows member templates
  21     // to work in the absence of member template friends.
  22  public:
  23 # else
  24     template <class Derived> friend class def_visitor;
  25 # endif
  26
  27     // unnamed visit, c.f. init<...>, container suites
  28     template <class V, class classT>
  29     static void visit(V const& v, classT& c)
  30     {
  31         v.derived_visitor().visit(c);
  32     }
  33
  34     // named visit, c.f. object, pure_virtual
  35     template <class V, class classT, class OptionalArgs>
  36     static void visit(
  37         V const& v
  38       , classT& c
  39       , char const* name
  40       , OptionalArgs const& options
  41     )
  42     {
  43         v.derived_visitor().visit(c, name, options);
  44     }
  45
  46 };
  47
  48
  49 template <class DerivedVisitor>
  50 class def_visitor
  51 {
  52     friend class def_visitor_access;
  53
  54 # if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \
  55     || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
  56     // Tasteless as this may seem, making all members public allows member templates
  57     // to work in the absence of member template friends.
  58  public:
  59 # else
  60     template <class T, class X1, class X2, class X3> friend class class_;
  61 # endif
  62
  63     // unnamed visit, c.f. init<...>, container suites
  64     template <class classT>
  65     void visit(classT& c) const
  66     {
  67         def_visitor_access::visit(*this, c);
  68     }
  69
  70     // named visit, c.f. object, pure_virtual
  71     template <class classT, class OptionalArgs>
  72     void visit(classT& c, char const* name, OptionalArgs const& options) const
  73     {
  74         def_visitor_access::visit(*this, c, name, options);
  75     }
  76
  77  protected:
  78     DerivedVisitor const& derived_visitor() const
  79     {
  80         return static_cast<DerivedVisitor const&>(*this);
  81     }
  82 };
  83
  84 }} // namespace boost::python
  85
  86 #endif // DEF_VISITOR_DWA2003810_HPP