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)
6 // See http://www.boost.org/libs/static_assert for documentation.
14 #ifndef BOOST_STATIC_ASSERT_HPP
15 #define BOOST_STATIC_ASSERT_HPP
17 #include <boost/config.hpp>
18 #include <boost/detail/workaround.hpp>
20 #if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__)
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.
26 #pragma GCC system_header
29 #ifndef BOOST_NO_CXX11_STATIC_ASSERT
30 # ifndef BOOST_NO_CXX11_VARIADIC_MACROS
31 # define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__)
33 # define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
36 # define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
41 // workaround for buggy integral-constant expression support:
42 #define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
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
51 // If the compiler issues warnings about old C style casts,
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)
58 # define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
61 # ifndef BOOST_NO_CXX11_VARIADIC_MACROS
62 # define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__)
64 # define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
68 // If the compiler warns about unused typedefs then enable this:
70 #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)))
71 # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
73 # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
76 #ifndef BOOST_NO_CXX11_STATIC_ASSERT
77 # ifndef BOOST_NO_CXX11_VARIADIC_MACROS
78 # define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__)
80 # define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
86 // HP aCC cannot deal with missing names for template value parameters
87 template <bool x> struct STATIC_ASSERTION_FAILURE;
89 template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
91 // HP aCC cannot deal with missing names for template value parameters
92 template<int x> struct static_assert_test{};
97 // Implicit instantiation requires that all member declarations be
98 // instantiated, but that the definitions are *not* instantiated.
100 // It's not particularly clear how this applies to enum's or typedefs;
101 // both are described as declarations [7.1.3] and [7.2] in the standard,
102 // however some compilers use "delayed evaluation" of one or more of
103 // these when implicitly instantiating templates. We use typedef declarations
104 // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
105 // version gets better results from your compiler...
108 // Both of these versions rely on sizeof(incomplete_type) generating an error
109 // message containing the name of the incomplete type. We use
110 // "STATIC_ASSERTION_FAILURE" as the type name here to generate
111 // an eye catching error message. The result of the sizeof expression is either
112 // used as an enum initialiser, or as a template argument depending which version
114 // Note that the argument to the assert is explicitly cast to bool using old-
115 // style casts: too many compilers currently have problems with static_cast
116 // when used inside integral constant expressions.
118 #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
120 #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
121 // __LINE__ macro broken when -ZI is used see Q199057
122 // fortunately MSVC ignores duplicate typedef's.
123 #define BOOST_STATIC_ASSERT( B ) \
124 typedef ::boost::static_assert_test<\
125 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
126 > boost_static_assert_typedef_
127 #elif defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
128 #define BOOST_STATIC_ASSERT( B ) \
129 typedef ::boost::static_assert_test<\
130 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
131 BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
132 #elif defined(BOOST_MSVC)
133 #define BOOST_STATIC_ASSERT(...) \
134 typedef ::boost::static_assert_test<\
135 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\
136 BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
137 #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
138 // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
139 // instead of warning in case of failure
140 # define BOOST_STATIC_ASSERT( B ) \
141 typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
142 [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
143 #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && !defined(BOOST_NO_CXX11_VARIADIC_MACROS)
144 // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
145 // instead of warning in case of failure
146 # define BOOST_STATIC_ASSERT(...) \
147 typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
148 [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ]
150 // special version for SGI MIPSpro compiler
151 #define BOOST_STATIC_ASSERT( B ) \
152 BOOST_STATIC_CONSTANT(bool, \
153 BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
154 typedef ::boost::static_assert_test<\
155 sizeof(::boost::STATIC_ASSERTION_FAILURE< \
156 BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
157 BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
158 #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
159 // special version for CodeWarrior <= 8.x
160 #define BOOST_STATIC_ASSERT( B ) \
161 BOOST_STATIC_CONSTANT(int, \
162 BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
163 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
166 # ifndef BOOST_NO_CXX11_VARIADIC_MACROS
167 # define BOOST_STATIC_ASSERT( ... ) \
168 typedef ::boost::static_assert_test<\
169 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\
170 BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
172 # define BOOST_STATIC_ASSERT( B ) \
173 typedef ::boost::static_assert_test<\
174 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
175 BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
180 // alternative enum based implementation:
181 # ifndef BOOST_NO_CXX11_VARIADIC_MACROS
182 # define BOOST_STATIC_ASSERT( ... ) \
183 enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
184 = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) }
186 # define BOOST_STATIC_ASSERT(B) \
187 enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
188 = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
191 #endif // defined(BOOST_NO_CXX11_STATIC_ASSERT)
193 #endif // BOOST_STATIC_ASSERT_HPP