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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33 // HP aCC cannot deal with missing names for template value parameters
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34 template <bool x> struct STATIC_ASSERTION_FAILURE;
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36 template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
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38 // HP aCC cannot deal with missing names for template value parameters
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39 template<int x> struct static_assert_test{};
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44 // Implicit instantiation requires that all member declarations be
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45 // instantiated, but that the definitions are *not* instantiated.
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47 // It's not particularly clear how this applies to enum's or typedefs;
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48 // both are described as declarations [7.1.3] and [7.2] in the standard,
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49 // however some compilers use "delayed evaluation" of one or more of
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50 // these when implicitly instantiating templates. We use typedef declarations
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51 // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
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52 // version gets better results from your compiler...
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55 // Both of these versions rely on sizeof(incomplete_type) generating an error
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56 // message containing the name of the incomplete type. We use
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57 // "STATIC_ASSERTION_FAILURE" as the type name here to generate
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58 // an eye catching error message. The result of the sizeof expression is either
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59 // used as an enum initialiser, or as a template argument depending which version
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61 // Note that the argument to the assert is explicitly cast to bool using old-
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62 // style casts: too many compilers currently have problems with static_cast
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63 // when used inside integral constant expressions.
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65 #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
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67 #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
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68 // __LINE__ macro broken when -ZI is used see Q199057
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69 // fortunately MSVC ignores duplicate typedef's.
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70 #define BOOST_STATIC_ASSERT( B ) \
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71 typedef ::boost::static_assert_test<\
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72 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
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73 > boost_static_assert_typedef_
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74 #elif defined(BOOST_MSVC)
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75 #define BOOST_STATIC_ASSERT( B ) \
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76 typedef ::boost::static_assert_test<\
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77 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
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78 BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
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79 #elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
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80 // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
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81 // instead of warning in case of failure
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82 # define BOOST_STATIC_ASSERT( B ) \
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83 typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
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84 [ ::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >::value ]
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85 #elif defined(__sgi)
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86 // special version for SGI MIPSpro compiler
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87 #define BOOST_STATIC_ASSERT( B ) \
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88 BOOST_STATIC_CONSTANT(bool, \
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89 BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
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90 typedef ::boost::static_assert_test<\
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91 sizeof(::boost::STATIC_ASSERTION_FAILURE< \
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92 BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
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93 BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
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94 #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
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95 // special version for CodeWarrior <= 8.x
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96 #define BOOST_STATIC_ASSERT( B ) \
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97 BOOST_STATIC_CONSTANT(int, \
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98 BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
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99 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) )
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102 #define BOOST_STATIC_ASSERT( B ) \
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103 typedef ::boost::static_assert_test<\
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104 sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
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105 BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
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109 // alternative enum based implementation:
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110 #define BOOST_STATIC_ASSERT( B ) \
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111 enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
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112 = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
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116 #endif // BOOST_STATIC_ASSERT_HPP
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