source: NonGTP/Boost/boost/python/def_visitor.hpp @ 857

Revision 857, 2.5 KB checked in by igarcia, 19 years ago (diff)
Line 
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
11namespace boost { namespace python {
12
13template <class DerivedVisitor> class def_visitor;
14template <class T, class X1, class X2, class X3> class class_;
15
16class 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
49template <class DerivedVisitor>
50class 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
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