static_assert.hpp
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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>
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 ) BOOST_STATIC_ASSERT( B )
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 // If the compiler warns about unused typedefs then enable this:
69 //
70 #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)))
71 # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
72 #else
73 # define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
74 #endif
75 
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__)
79 # else
80 # define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
81 # endif
82 #else
83 
84 namespace boost{
85 
86 // HP aCC cannot deal with missing names for template value parameters
87 template <bool x> struct STATIC_ASSERTION_FAILURE;
88 
89 template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
90 
91 // HP aCC cannot deal with missing names for template value parameters
92 template<int x> struct static_assert_test{};
93 
94 }
95 
96 //
97 // Implicit instantiation requires that all member declarations be
98 // instantiated, but that the definitions are *not* instantiated.
99 //
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...
106 //
107 // Implementation:
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
113 // is in use...
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.
117 //
118 #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
119 
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 ]
149 #elif defined(__sgi)
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 ) >) )
164 #else
165 // generic version
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
171 # else
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
176 # endif
177 #endif
178 
179 #else
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__ ) >) }
185 # else
186 # define BOOST_STATIC_ASSERT(B) \
187  enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
188  = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
189 # endif
190 #endif
191 #endif // defined(BOOST_NO_CXX11_STATIC_ASSERT)
192 
193 #endif // BOOST_STATIC_ASSERT_HPP
194 
195 
BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE.
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Author(s): Sergey Dorodnicov , Doron Hirshberg , Mark Horn , Reagan Lopez , Itay Carpis
autogenerated on Mon May 3 2021 02:50:10