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1 | // (C) Copyright John Maddock 2000. | |
2 | // Use, modification and distribution are subject to the | |
3 | // Boost Software License, Version 1.0. (See accompanying file | |
4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | // See http://www.boost.org/libs/static_assert for documentation. | |
7 | ||
8 | /* | |
9 | Revision history: | |
10 | 02 August 2000 | |
11 | Initial version. | |
12 | */ | |
13 | ||
14 | #ifndef BOOST_STATIC_ASSERT_HPP | |
15 | #define BOOST_STATIC_ASSERT_HPP | |
16 | ||
17 | #include <boost/config.hpp> | |
18 | #include <boost/detail/workaround.hpp> | |
19 | ||
20 | #if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__) | |
21 | // | |
22 | // This is horrible, but it seems to be the only we can shut up the | |
23 | // "anonymous variadic macros were introduced in C99 [-Wvariadic-macros]" | |
24 | // warning that get spewed out otherwise in non-C++11 mode. | |
25 | // | |
26 | #pragma GCC system_header | |
27 | #endif | |
28 | ||
29 | #ifndef BOOST_NO_CXX11_STATIC_ASSERT | |
30 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
31 | # define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__) | |
32 | # else | |
33 | # define BOOST_STATIC_ASSERT_MSG( B, Msg ) static_assert( B, Msg ) | |
34 | # endif | |
35 | #else | |
36 | # define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B ) | |
37 | #endif | |
38 | ||
39 | #ifdef __BORLANDC__ | |
40 | // | |
41 | // workaround for buggy integral-constant expression support: | |
42 | #define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS | |
43 | #endif | |
44 | ||
45 | #if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4)) | |
46 | // gcc 3.3 and 3.4 don't produce good error messages with the default version: | |
47 | # define BOOST_SA_GCC_WORKAROUND | |
48 | #endif | |
49 | ||
50 | // | |
51 | // If the compiler issues warnings about old C style casts, | |
52 | // then enable this: | |
53 | // | |
54 | #if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4))) | |
55 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
56 | # define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) ((__VA_ARGS__) == 0 ? false : true) | |
57 | # else | |
58 | # define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true) | |
59 | # endif | |
60 | #else | |
61 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
62 | # define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__) | |
63 | # else | |
64 | # define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x) | |
65 | # endif | |
66 | #endif | |
67 | ||
68 | #ifndef BOOST_NO_CXX11_STATIC_ASSERT | |
69 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
70 | # define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__) | |
71 | # else | |
72 | # define BOOST_STATIC_ASSERT( B ) static_assert(B, #B) | |
73 | # endif | |
74 | #else | |
75 | ||
76 | namespace boost{ | |
77 | ||
78 | // HP aCC cannot deal with missing names for template value parameters | |
79 | template <bool x> struct STATIC_ASSERTION_FAILURE; | |
80 | ||
81 | template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; }; | |
82 | ||
83 | // HP aCC cannot deal with missing names for template value parameters | |
84 | template<int x> struct static_assert_test{}; | |
85 | ||
86 | } | |
87 | ||
88 | // | |
89 | // Implicit instantiation requires that all member declarations be | |
90 | // instantiated, but that the definitions are *not* instantiated. | |
91 | // | |
92 | // It's not particularly clear how this applies to enum's or typedefs; | |
93 | // both are described as declarations [7.1.3] and [7.2] in the standard, | |
94 | // however some compilers use "delayed evaluation" of one or more of | |
95 | // these when implicitly instantiating templates. We use typedef declarations | |
96 | // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum | |
97 | // version gets better results from your compiler... | |
98 | // | |
99 | // Implementation: | |
100 | // Both of these versions rely on sizeof(incomplete_type) generating an error | |
101 | // message containing the name of the incomplete type. We use | |
102 | // "STATIC_ASSERTION_FAILURE" as the type name here to generate | |
103 | // an eye catching error message. The result of the sizeof expression is either | |
104 | // used as an enum initialiser, or as a template argument depending which version | |
105 | // is in use... | |
106 | // Note that the argument to the assert is explicitly cast to bool using old- | |
107 | // style casts: too many compilers currently have problems with static_cast | |
108 | // when used inside integral constant expressions. | |
109 | // | |
110 | #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS) | |
111 | ||
112 | #if defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS) | |
113 | #define BOOST_STATIC_ASSERT( B ) \ | |
114 | typedef ::boost::static_assert_test<\ | |
115 | sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\ | |
116 | BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) | |
117 | #elif defined(BOOST_MSVC) | |
118 | #define BOOST_STATIC_ASSERT(...) \ | |
119 | typedef ::boost::static_assert_test<\ | |
120 | sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\ | |
121 | BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__) | |
122 | #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && defined(BOOST_NO_CXX11_VARIADIC_MACROS) | |
123 | // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error | |
124 | // instead of warning in case of failure | |
125 | # define BOOST_STATIC_ASSERT( B ) \ | |
126 | typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \ | |
127 | [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ] | |
128 | #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && !defined(BOOST_NO_CXX11_VARIADIC_MACROS) | |
129 | // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error | |
130 | // instead of warning in case of failure | |
131 | # define BOOST_STATIC_ASSERT(...) \ | |
132 | typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \ | |
133 | [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ] | |
134 | #elif defined(__sgi) | |
135 | // special version for SGI MIPSpro compiler | |
136 | #define BOOST_STATIC_ASSERT( B ) \ | |
137 | BOOST_STATIC_CONSTANT(bool, \ | |
138 | BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \ | |
139 | typedef ::boost::static_assert_test<\ | |
140 | sizeof(::boost::STATIC_ASSERTION_FAILURE< \ | |
141 | BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\ | |
142 | BOOST_JOIN(boost_static_assert_typedef_, __LINE__) | |
143 | #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003) | |
144 | // special version for CodeWarrior <= 8.x | |
145 | #define BOOST_STATIC_ASSERT( B ) \ | |
146 | BOOST_STATIC_CONSTANT(int, \ | |
147 | BOOST_JOIN(boost_static_assert_test_, __LINE__) = \ | |
148 | sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) ) | |
149 | #else | |
150 | // generic version | |
151 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
152 | # define BOOST_STATIC_ASSERT( ... ) \ | |
153 | typedef ::boost::static_assert_test<\ | |
154 | sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\ | |
155 | BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED | |
156 | # else | |
157 | # define BOOST_STATIC_ASSERT( B ) \ | |
158 | typedef ::boost::static_assert_test<\ | |
159 | sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\ | |
160 | BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_ATTRIBUTE_UNUSED | |
161 | # endif | |
162 | #endif | |
163 | ||
164 | #else | |
165 | // alternative enum based implementation: | |
166 | # ifndef BOOST_NO_CXX11_VARIADIC_MACROS | |
167 | # define BOOST_STATIC_ASSERT( ... ) \ | |
168 | enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \ | |
169 | = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) } | |
170 | # else | |
171 | # define BOOST_STATIC_ASSERT(B) \ | |
172 | enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \ | |
173 | = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) } | |
174 | # endif | |
175 | #endif | |
176 | #endif // defined(BOOST_NO_CXX11_STATIC_ASSERT) | |
177 | ||
178 | #endif // BOOST_STATIC_ASSERT_HPP | |
179 | ||
180 |