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) |
57 | # else |
58 | # define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) != 0) |
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 | |
181 | |