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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 KEYWORDS_DWA2002323_HPP | |
6 | # define KEYWORDS_DWA2002323_HPP | |
7 | ||
8 | # include <boost/python/detail/prefix.hpp> | |
9 | ||
10 | # include <boost/python/args_fwd.hpp> | |
11 | # include <boost/config.hpp> | |
12 | # include <boost/python/detail/preprocessor.hpp> | |
13 | # include <boost/python/detail/type_list.hpp> | |
14 | ||
15 | # include <boost/type_traits/is_reference.hpp> | |
16 | # include <boost/type_traits/remove_reference.hpp> | |
17 | # include <boost/type_traits/remove_cv.hpp> | |
18 | ||
19 | # include <boost/preprocessor/enum_params.hpp> | |
20 | # include <boost/preprocessor/repeat.hpp> | |
21 | # include <boost/preprocessor/facilities/intercept.hpp> | |
22 | # include <boost/preprocessor/iteration/local.hpp> | |
23 | ||
24 | # include <boost/python/detail/mpl_lambda.hpp> | |
25 | # include <boost/python/object_core.hpp> | |
26 | ||
27 | # include <boost/mpl/bool.hpp> | |
28 | ||
29 | # include <cstddef> | |
30 | # include <algorithm> | |
31 | ||
32 | namespace boost { namespace python { | |
33 | ||
34 | typedef detail::keywords<1> arg; | |
35 | typedef arg arg_; // gcc 2.96 workaround | |
36 | ||
37 | namespace detail | |
38 | { | |
39 | template <std::size_t nkeywords> | |
40 | struct keywords_base | |
41 | { | |
42 | BOOST_STATIC_CONSTANT(std::size_t, size = nkeywords); | |
43 | ||
44 | keyword_range range() const | |
45 | { | |
46 | return keyword_range(elements, elements + nkeywords); | |
47 | } | |
48 | ||
49 | keyword elements[nkeywords]; | |
50 | ||
51 | keywords<nkeywords+1> | |
52 | operator,(python::arg const &k) const; | |
53 | ||
54 | keywords<nkeywords + 1> | |
55 | operator,(char const *name) const; | |
56 | }; | |
57 | ||
58 | template <std::size_t nkeywords> | |
59 | struct keywords : keywords_base<nkeywords> | |
60 | { | |
61 | }; | |
62 | ||
63 | template <> | |
64 | struct keywords<1> : keywords_base<1> | |
65 | { | |
66 | explicit keywords(char const *name) | |
67 | { | |
68 | elements[0].name = name; | |
69 | } | |
70 | ||
71 | template <class T> | |
72 | python::arg& operator=(T const& value) | |
73 | { | |
74 | object z(value); | |
75 | elements[0].default_value = handle<>(python::borrowed(object(value).ptr())); | |
76 | return *this; | |
77 | } | |
78 | ||
79 | operator detail::keyword const&() const | |
80 | { | |
81 | return elements[0]; | |
82 | } | |
83 | }; | |
84 | ||
85 | template <std::size_t nkeywords> | |
86 | inline | |
87 | keywords<nkeywords+1> | |
88 | keywords_base<nkeywords>::operator,(python::arg const &k) const | |
89 | { | |
90 | keywords<nkeywords> const& l = *static_cast<keywords<nkeywords> const*>(this); | |
91 | python::detail::keywords<nkeywords+1> res; | |
92 | std::copy(l.elements, l.elements+nkeywords, res.elements); | |
93 | res.elements[nkeywords] = k.elements[0]; | |
94 | return res; | |
95 | } | |
96 | ||
97 | template <std::size_t nkeywords> | |
98 | inline | |
99 | keywords<nkeywords + 1> | |
100 | keywords_base<nkeywords>::operator,(char const *name) const | |
101 | { | |
102 | return this->operator,(python::arg(name)); | |
103 | } | |
104 | ||
105 | template<typename T> | |
106 | struct is_keywords | |
107 | { | |
108 | BOOST_STATIC_CONSTANT(bool, value = false); | |
109 | }; | |
110 | ||
111 | template<std::size_t nkeywords> | |
112 | struct is_keywords<keywords<nkeywords> > | |
113 | { | |
114 | BOOST_STATIC_CONSTANT(bool, value = true); | |
115 | }; | |
116 | template <class T> | |
117 | struct is_reference_to_keywords | |
118 | { | |
119 | BOOST_STATIC_CONSTANT(bool, is_ref = is_reference<T>::value); | |
120 | typedef typename remove_reference<T>::type deref; | |
121 | typedef typename remove_cv<deref>::type key_t; | |
122 | BOOST_STATIC_CONSTANT(bool, is_key = is_keywords<key_t>::value); | |
123 | BOOST_STATIC_CONSTANT(bool, value = (is_ref & is_key)); | |
124 | ||
125 | typedef mpl::bool_<value> type; | |
126 | BOOST_PYTHON_MPL_LAMBDA_SUPPORT(1,is_reference_to_keywords,(T)) | |
127 | }; | |
128 | } | |
129 | ||
130 | inline detail::keywords<1> args(char const* name) | |
131 | { | |
132 | return detail::keywords<1>(name); | |
133 | } | |
134 | ||
135 | # define BOOST_PYTHON_ASSIGN_NAME(z, n, _) result.elements[n].name = name##n; | |
136 | # define BOOST_PP_LOCAL_MACRO(n) \ | |
137 | inline detail::keywords<n> args(BOOST_PP_ENUM_PARAMS_Z(1, n, char const* name)) \ | |
138 | { \ | |
139 | detail::keywords<n> result; \ | |
140 | BOOST_PP_REPEAT_1(n, BOOST_PYTHON_ASSIGN_NAME, _) \ | |
141 | return result; \ | |
142 | } | |
143 | # define BOOST_PP_LOCAL_LIMITS (2, BOOST_PYTHON_MAX_ARITY) | |
144 | # include BOOST_PP_LOCAL_ITERATE() | |
145 | ||
146 | }} // namespace boost::python | |
147 | ||
148 | ||
149 | # endif // KEYWORDS_DWA2002323_HPP |