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comparison DEPENDENCIES/generic/include/boost/variant/multivisitors.hpp @ 101:c530137014c0

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Update Boost headers (1.58.0)
author Chris Cannam
date Mon, 07 Sep 2015 11:12:49 +0100
parents 2665513ce2d3
children
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100:793467b5e61c 101:c530137014c0
1 // Boost.Varaint 1 // Boost.Varaint
2 // Multivisitors defined here 2 // Multivisitors defined here
3 // 3 //
4 // See http://www.boost.org for most recent version, including documentation. 4 // See http://www.boost.org for most recent version, including documentation.
5 // 5 //
6 // Copyright Antony Polukhin, 2013. 6 // Copyright Antony Polukhin, 2013-2014.
7 // 7 //
8 // Distributed under the Boost 8 // Distributed under the Boost
9 // Software License, Version 1.0. (See accompanying file 9 // Software License, Version 1.0. (See accompanying file
10 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt). 10 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
11 11
12 #ifndef BOOST_VARIANT_MULTIVISITORS_HPP 12 #ifndef BOOST_VARIANT_MULTIVISITORS_HPP
13 #define BOOST_VARIANT_MULTIVISITORS_HPP 13 #define BOOST_VARIANT_MULTIVISITORS_HPP
14 14
15 #if defined(_MSC_VER) && (_MSC_VER >= 1020) 15 #if defined(_MSC_VER)
16 # pragma once 16 # pragma once
17 #endif 17 #endif
18 18
19 #include <boost/variant.hpp> 19 #include <boost/config.hpp>
20 #include <boost/bind.hpp> 20 #include "boost/variant/variant_fwd.hpp" // for BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES
21 21
22 #include <boost/preprocessor/repetition.hpp> 22 #if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_HDR_TUPLE)
23 #include <boost/preprocessor/punctuation/comma_if.hpp> 23 # include <boost/variant/detail/multivisitors_cpp11_based.hpp>
24 #include <boost/preprocessor/arithmetic/add.hpp> 24 # if !defined(BOOST_NO_CXX14_DECLTYPE_AUTO) && !defined(BOOST_NO_CXX11_DECLTYPE_N3276)
25 #include <boost/preprocessor/arithmetic/sub.hpp> 25 # include <boost/variant/detail/multivisitors_cpp14_based.hpp>
26 26 # endif
27 #ifndef BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS 27 #else
28 # define BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS 4 28 # include <boost/variant/detail/multivisitors_preprocessor_based.hpp>
29 #endif 29 #endif
30
31 namespace boost {
32
33 namespace detail { namespace variant {
34
35 template <class VisitorT, class Visitable1T, class Visitable2T>
36 struct two_variables_holder {
37 private:
38 VisitorT& visitor_;
39 Visitable1T& visitable1_;
40 Visitable2T& visitable2_;
41
42 // required to supress warnings and enshure that we do not copy
43 // this visitor
44 two_variables_holder& operator=(const two_variables_holder&);
45
46 public:
47 typedef BOOST_DEDUCED_TYPENAME VisitorT::result_type result_type;
48
49 explicit two_variables_holder(VisitorT& visitor, Visitable1T& visitable1, Visitable2T& visitable2) BOOST_NOEXCEPT
50 : visitor_(visitor)
51 , visitable1_(visitable1)
52 , visitable2_(visitable2)
53 {}
54
55 #define BOOST_VARIANT_OPERATOR_BEG() \
56 return ::boost::apply_visitor( \
57 ::boost::bind<result_type>(boost::ref(visitor_), _1, _2 \
58 /**/
59
60 #define BOOST_VARIANT_OPERATOR_END() \
61 ), visitable1_, visitable2_); \
62 /**/
63
64 #define BOOST_VARANT_VISITORS_VARIABLES_PRINTER(z, n, data) \
65 BOOST_PP_COMMA() boost::ref( BOOST_PP_CAT(vis, n) ) \
66 /**/
67
68 #define BOOST_VARIANT_VISIT(z, n, data) \
69 template <BOOST_PP_ENUM_PARAMS(BOOST_PP_ADD(n, 1), class VisitableUnwrapped)> \
70 BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type) operator()( \
71 BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ADD(n, 1), VisitableUnwrapped, & vis) \
72 ) const \
73 { \
74 BOOST_VARIANT_OPERATOR_BEG() \
75 BOOST_PP_REPEAT(BOOST_PP_ADD(n, 1), BOOST_VARANT_VISITORS_VARIABLES_PRINTER, ~) \
76 BOOST_VARIANT_OPERATOR_END() \
77 } \
78 /**/
79
80 BOOST_PP_REPEAT( BOOST_PP_SUB(BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS, 2), BOOST_VARIANT_VISIT, ~)
81 #undef BOOST_VARIANT_OPERATOR_BEG
82 #undef BOOST_VARIANT_OPERATOR_END
83 #undef BOOST_VARANT_VISITORS_VARIABLES_PRINTER
84 #undef BOOST_VARIANT_VISIT
85
86 };
87
88 template <class VisitorT, class Visitable1T, class Visitable2T>
89 inline two_variables_holder<VisitorT, Visitable1T, Visitable2T> make_two_variables_holder(
90 VisitorT& visitor, Visitable1T& visitable1, Visitable2T& visitable2
91 ) BOOST_NOEXCEPT
92 {
93 return two_variables_holder<VisitorT, Visitable1T, Visitable2T>(visitor, visitable1, visitable2);
94 }
95
96 template <class VisitorT, class Visitable1T, class Visitable2T>
97 inline two_variables_holder<const VisitorT, Visitable1T, Visitable2T> make_two_variables_holder(
98 const VisitorT& visitor, Visitable1T& visitable1, Visitable2T& visitable2
99 ) BOOST_NOEXCEPT
100 {
101 return two_variables_holder<const VisitorT, Visitable1T, Visitable2T>(visitor, visitable1, visitable2);
102 }
103
104 }} // namespace detail::variant
105
106 #define BOOST_VARIANT_APPLY_VISITOR_BEG() \
107 return ::boost::apply_visitor( \
108 boost::detail::variant::make_two_variables_holder(visitor, var0 , var1), \
109 var2 \
110 /**/
111
112 #define BOOST_VARIANT_APPLY_VISITOR_END() \
113 ); \
114 /**/
115
116 #define BOOST_VARANT_VISITORS_VARIABLES_PRINTER(z, n, data) \
117 BOOST_PP_COMMA() BOOST_PP_CAT(var, BOOST_PP_ADD(n, 3)) \
118 /**/
119
120 #define BOOST_VARIANT_VISIT(z, n, data) \
121 template <class Visitor BOOST_PP_COMMA() BOOST_PP_ENUM_PARAMS(BOOST_PP_ADD(n, 3), class T)> \
122 inline BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(BOOST_DEDUCED_TYPENAME Visitor::result_type) apply_visitor( \
123 data BOOST_PP_COMMA() BOOST_PP_ENUM_BINARY_PARAMS(BOOST_PP_ADD(n, 3), T, & var) \
124 ) \
125 { \
126 BOOST_VARIANT_APPLY_VISITOR_BEG() \
127 BOOST_PP_REPEAT(n, BOOST_VARANT_VISITORS_VARIABLES_PRINTER, ~) \
128 BOOST_VARIANT_APPLY_VISITOR_END() \
129 } \
130 /**/
131
132 BOOST_PP_REPEAT( BOOST_PP_SUB(BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS, 2), BOOST_VARIANT_VISIT, const Visitor& visitor)
133 BOOST_PP_REPEAT( BOOST_PP_SUB(BOOST_VARAINT_MAX_MULTIVIZITOR_PARAMS, 2), BOOST_VARIANT_VISIT, Visitor& visitor)
134
135 #undef BOOST_VARIANT_APPLY_VISITOR_BEG
136 #undef BOOST_VARIANT_APPLY_VISITOR_END
137 #undef BOOST_VARANT_VISITORS_VARIABLES_PRINTER
138 #undef BOOST_VARIANT_VISIT
139
140 } // namespace boost
141 30
142 #endif // BOOST_VARIANT_MULTIVISITORS_HPP 31 #endif // BOOST_VARIANT_MULTIVISITORS_HPP
143 32