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 |
87 | |