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1 | |
2 | // Copyright (C) 2005 Igor Chesnokov, mailto:ichesnokov@gmail.com (VC 6.5,VC 7.1 + counter code) | |
3 | // Copyright (C) 2005-2007 Peder Holt (VC 7.0 + framework) | |
4 | // Copyright (C) 2006 Steven Watanabe (VC 8.0) | |
5 | ||
6 | // Use, modification and distribution is subject to the Boost Software | |
7 | // License, Version 1.0. (http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #ifndef BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED | |
10 | # define BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED | |
11 | ||
12 | # include <boost/config.hpp> | |
13 | # include <boost/detail/workaround.hpp> | |
14 | # include <boost/mpl/int.hpp> | |
15 | # include <boost/type_traits/is_function.hpp> | |
16 | # include <boost/utility/enable_if.hpp> | |
17 | ||
b32b8144 | 18 | # include <typeinfo> |
7c673cae FG |
19 | |
20 | namespace boost | |
21 | { | |
22 | namespace type_of | |
23 | { | |
24 | ||
25 | //Compile time constant code | |
b32b8144 | 26 | # if defined(_MSC_EXTENSIONS) |
7c673cae FG |
27 | template<int N> struct the_counter; |
28 | ||
29 | template<typename T,int N = 5/*for similarity*/> | |
30 | struct encode_counter | |
31 | { | |
32 | __if_exists(the_counter<N + 256>) | |
33 | { | |
34 | BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 257>::count)); | |
35 | } | |
36 | __if_not_exists(the_counter<N + 256>) | |
37 | { | |
38 | __if_exists(the_counter<N + 64>) | |
39 | { | |
40 | BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 65>::count)); | |
41 | } | |
42 | __if_not_exists(the_counter<N + 64>) | |
43 | { | |
44 | __if_exists(the_counter<N + 16>) | |
45 | { | |
46 | BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 17>::count)); | |
47 | } | |
48 | __if_not_exists(the_counter<N + 16>) | |
49 | { | |
50 | __if_exists(the_counter<N + 4>) | |
51 | { | |
52 | BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 5>::count)); | |
53 | } | |
54 | __if_not_exists(the_counter<N + 4>) | |
55 | { | |
56 | __if_exists(the_counter<N>) | |
57 | { | |
58 | BOOST_STATIC_CONSTANT(unsigned,count=(encode_counter<T,N + 1>::count)); | |
59 | } | |
60 | __if_not_exists(the_counter<N>) | |
61 | { | |
62 | BOOST_STATIC_CONSTANT(unsigned,count=N); | |
63 | typedef the_counter<N> type; | |
64 | } | |
65 | } | |
66 | } | |
67 | } | |
68 | } | |
69 | }; | |
70 | ||
71 | # define BOOST_TYPEOF_INDEX(T) (encode_counter<T>::count) | |
72 | # define BOOST_TYPEOF_NEXT_INDEX(next) | |
73 | # else | |
74 | template<int N> struct encode_counter : encode_counter<N - 1> {}; | |
75 | template<> struct encode_counter<0> {}; | |
76 | ||
77 | //Need to default to a larger value than 4, as due to MSVC's ETI errors. (sizeof(int)==4) | |
78 | char (*encode_index(...))[5]; | |
79 | ||
80 | # define BOOST_TYPEOF_INDEX(T) (sizeof(*boost::type_of::encode_index((boost::type_of::encode_counter<1005>*)0))) | |
81 | # define BOOST_TYPEOF_NEXT_INDEX(next) friend char (*encode_index(encode_counter<next>*))[next]; | |
82 | # endif | |
83 | ||
84 | //Typeof code | |
85 | ||
b32b8144 | 86 | # if BOOST_WORKAROUND(BOOST_MSVC,>=1400) |
7c673cae FG |
87 | struct msvc_extract_type_default_param {}; |
88 | ||
89 | template<typename ID, typename T = msvc_extract_type_default_param> | |
90 | struct msvc_extract_type; | |
91 | ||
92 | template<typename ID> | |
93 | struct msvc_extract_type<ID, msvc_extract_type_default_param> { | |
94 | template<bool> | |
95 | struct id2type_impl; | |
96 | ||
97 | typedef id2type_impl<true> id2type; | |
98 | }; | |
99 | ||
100 | template<typename ID, typename T> | |
101 | struct msvc_extract_type : msvc_extract_type<ID,msvc_extract_type_default_param> | |
102 | { | |
103 | template<> | |
104 | struct id2type_impl<true> //VC8.0 specific bugfeature | |
105 | { | |
106 | typedef T type; | |
107 | }; | |
108 | template<bool> | |
109 | struct id2type_impl; | |
110 | ||
111 | typedef id2type_impl<true> id2type; | |
112 | }; | |
113 | ||
114 | template<typename T, typename ID> | |
115 | struct msvc_register_type : msvc_extract_type<ID, T> | |
116 | { | |
117 | }; | |
118 | # else | |
119 | template<typename ID> | |
120 | struct msvc_extract_type | |
121 | { | |
122 | struct id2type; | |
123 | }; | |
124 | ||
125 | template<typename T, typename ID> | |
126 | struct msvc_register_type : msvc_extract_type<ID> | |
127 | { | |
128 | typedef msvc_extract_type<ID> base_type; | |
129 | struct base_type::id2type // This uses nice VC6.5 and VC7.1 bugfeature | |
130 | { | |
131 | typedef T type; | |
132 | }; | |
133 | }; | |
134 | # endif | |
7c673cae | 135 | |
7c673cae FG |
136 | template<int ID> |
137 | struct msvc_typeid_wrapper { | |
138 | typedef typename msvc_extract_type<mpl::int_<ID> >::id2type id2type; | |
139 | typedef typename id2type::type type; | |
140 | }; | |
141 | //Workaround for ETI-bug for VC6 and VC7 | |
142 | template<> | |
143 | struct msvc_typeid_wrapper<1> { | |
144 | typedef msvc_typeid_wrapper<1> type; | |
145 | }; | |
146 | //Workaround for ETI-bug for VC7.1 | |
147 | template<> | |
148 | struct msvc_typeid_wrapper<4> { | |
149 | typedef msvc_typeid_wrapper<4> type; | |
150 | }; | |
151 | ||
152 | //Tie it all together | |
153 | template<typename T> | |
154 | struct encode_type | |
155 | { | |
156 | //Get the next available compile time constants index | |
157 | BOOST_STATIC_CONSTANT(unsigned,value=BOOST_TYPEOF_INDEX(T)); | |
158 | //Instantiate the template | |
159 | typedef typename msvc_register_type<T,mpl::int_<value> >::id2type type; | |
160 | //Set the next compile time constants index | |
161 | BOOST_STATIC_CONSTANT(unsigned,next=value+1); | |
162 | //Increment the compile time constant (only needed when extensions are not active | |
163 | BOOST_TYPEOF_NEXT_INDEX(next); | |
164 | }; | |
165 | ||
166 | template<class T> | |
167 | struct sizer | |
168 | { | |
169 | typedef char(*type)[encode_type<T>::value]; | |
170 | }; | |
7c673cae FG |
171 | template<typename T> typename disable_if< |
172 | typename is_function<T>::type, | |
173 | typename sizer<T>::type>::type encode_start(T const&); | |
174 | ||
175 | template<typename T> typename enable_if< | |
176 | typename is_function<T>::type, | |
177 | typename sizer<T>::type>::type encode_start(T&); | |
7c673cae FG |
178 | template<typename Organizer, typename T> |
179 | msvc_register_type<T,Organizer> typeof_register_type(const T&,Organizer* =0); | |
180 | ||
181 | # define BOOST_TYPEOF(expr) \ | |
182 | boost::type_of::msvc_typeid_wrapper<sizeof(*boost::type_of::encode_start(expr))>::type | |
183 | ||
184 | # define BOOST_TYPEOF_TPL(expr) typename BOOST_TYPEOF(expr) | |
185 | ||
186 | # define BOOST_TYPEOF_NESTED_TYPEDEF_TPL(name,expr) \ | |
187 | struct name {\ | |
b32b8144 | 188 | enum {_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr))};\ |
7c673cae FG |
189 | typedef typename boost::type_of::msvc_extract_type<name>::id2type id2type;\ |
190 | typedef typename id2type::type type;\ | |
191 | }; | |
192 | ||
193 | # define BOOST_TYPEOF_NESTED_TYPEDEF(name,expr) \ | |
194 | struct name {\ | |
b32b8144 | 195 | enum {_typeof_register_value=sizeof(boost::type_of::typeof_register_type<name>(expr))};\ |
7c673cae FG |
196 | typedef boost::type_of::msvc_extract_type<name>::id2type id2type;\ |
197 | typedef id2type::type type;\ | |
198 | }; | |
199 | ||
7c673cae FG |
200 | } |
201 | } | |
202 | ||
203 | #endif//BOOST_TYPEOF_MSVC_TYPEOF_IMPL_HPP_INCLUDED |