1 // (C) Copyright John Maddock 2000.
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2 // Use, modification and distribution are subject to the
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3 // Boost Software License, Version 1.0. (See accompanying file
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4 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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6 // See http://www.boost.org/libs/static_assert for documentation.
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14 #ifndef BOOST_STATIC_ASSERT_HPP
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15 #define BOOST_STATIC_ASSERT_HPP
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17 #include <boost/config.hpp>
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18 #include <boost/detail/workaround.hpp>
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22 // workaround for buggy integral-constant expression support:
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23 #define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
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26 #if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
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27 // gcc 3.3 and 3.4 don't produce good error messages with the default version:
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28 # define BOOST_SA_GCC_WORKAROUND
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32 // If the compiler issues warnings about old C style casts,
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33 // then enable this:
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35 #if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
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36 # define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
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38 # define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
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41 #ifdef BOOST_HAS_STATIC_ASSERT
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42 # define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
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47 // HP aCC cannot deal with missing names for template value parameters
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48 template <bool x> struct STATIC_ASSERTION_FAILURE;
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50 template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
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52 // HP aCC cannot deal with missing names for template value parameters
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53 template<int x> struct static_assert_test{};
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58 // Implicit instantiation requires that all member declarations be
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59 // instantiated, but that the definitions are *not* instantiated.
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61 // It's not particularly clear how this applies to enum's or typedefs;
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62 // both are described as declarations [7.1.3] and [7.2] in the standard,
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63 // however some compilers use "delayed evaluation" of one or more of
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64 // these when implicitly instantiating templates. We use typedef declarations
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65 // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
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66 // version gets better results from your compiler...
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69 // Both of these versions rely on sizeof(incomplete_type) generating an error
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70 // message containing the name of the incomplete type. We use
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71 // "STATIC_ASSERTION_FAILURE" as the type name here to generate
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72 // an eye catching error message. The result of the sizeof expression is either
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73 // used as an enum initialiser, or as a template argument depending which version
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75 // Note that the argument to the assert is explicitly cast to bool using old-
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76 // style casts: too many compilers currently have problems with static_cast
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77 // when used inside integral constant expressions.
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79 #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
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81 #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
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82 // __LINE__ macro broken when -ZI is used see Q199057
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83 // fortunately MSVC ignores duplicate typedef's.
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84 #define BOOST_STATIC_ASSERT( B ) \
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85 typedef ::boost::static_assert_test<\
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86 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
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87 > boost_static_assert_typedef_
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88 #elif defined(BOOST_MSVC)
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89 #define BOOST_STATIC_ASSERT( B ) \
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90 typedef ::boost::static_assert_test<\
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91 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
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92 BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
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93 #elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
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94 // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
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95 // instead of warning in case of failure
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96 # define BOOST_STATIC_ASSERT( B ) \
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97 typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
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98 [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
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99 #elif defined(__sgi)
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100 // special version for SGI MIPSpro compiler
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101 #define BOOST_STATIC_ASSERT( B ) \
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102 BOOST_STATIC_CONSTANT(bool, \
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103 BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
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104 typedef ::boost::static_assert_test<\
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105 sizeof(::boost::STATIC_ASSERTION_FAILURE< \
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106 BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
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107 BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
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108 #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
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109 // special version for CodeWarrior <= 8.x
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110 #define BOOST_STATIC_ASSERT( B ) \
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111 BOOST_STATIC_CONSTANT(int, \
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112 BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
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113 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
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116 #define BOOST_STATIC_ASSERT( B ) \
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117 typedef ::boost::static_assert_test<\
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118 sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
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119 BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
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123 // alternative enum based implementation:
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124 #define BOOST_STATIC_ASSERT( B ) \
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125 enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
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126 = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
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128 #endif // ndef BOOST_HAS_STATIC_ASSERT
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130 #endif // BOOST_STATIC_ASSERT_HPP
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