Chris@16: //  (C) Copyright John Maddock 2000.
Chris@16: //  Use, modification and distribution are subject to the 
Chris@16: //  Boost Software License, Version 1.0. (See accompanying file 
Chris@16: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See http://www.boost.org/libs/static_assert for documentation.
Chris@16: 
Chris@16: /*
Chris@16:  Revision history:
Chris@16:    02 August 2000
Chris@16:       Initial version.
Chris@16: */
Chris@16: 
Chris@16: #ifndef BOOST_STATIC_ASSERT_HPP
Chris@16: #define BOOST_STATIC_ASSERT_HPP
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: 
Chris@16: #if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__)
Chris@16: //
Chris@16: // This is horrible, but it seems to be the only we can shut up the
Chris@16: // "anonymous variadic macros were introduced in C99 [-Wvariadic-macros]"
Chris@16: // warning that get spewed out otherwise in non-C++11 mode.
Chris@16: //
Chris@16: #pragma GCC system_header
Chris@16: #endif
Chris@16: 
Chris@16: #ifndef BOOST_NO_CXX11_STATIC_ASSERT
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #     define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__)
Chris@16: #  else
Chris@16: #     define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
Chris@16: #  endif
Chris@16: #else
Chris@16: #     define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
Chris@16: #endif
Chris@16: 
Chris@16: #ifdef __BORLANDC__
Chris@16: //
Chris@16: // workaround for buggy integral-constant expression support:
Chris@16: #define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
Chris@16: // gcc 3.3 and 3.4 don't produce good error messages with the default version:
Chris@16: #  define BOOST_SA_GCC_WORKAROUND
Chris@16: #endif
Chris@16: 
Chris@16: //
Chris@16: // If the compiler issues warnings about old C style casts,
Chris@16: // then enable this:
Chris@16: //
Chris@16: #if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #     define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) ((__VA_ARGS__) == 0 ? false : true)
Chris@16: #  else
Chris@16: #     define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
Chris@16: #  endif
Chris@16: #else
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #     define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__)
Chris@16: #  else
Chris@16: #     define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
Chris@16: #  endif
Chris@16: #endif
Chris@16: //
Chris@16: // If the compiler warns about unused typedefs then enable this:
Chris@16: //
Chris@16: #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)))
Chris@16: #  define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
Chris@16: #else
Chris@16: #  define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
Chris@16: #endif
Chris@16: 
Chris@16: #ifndef BOOST_NO_CXX11_STATIC_ASSERT
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #     define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__)
Chris@16: #  else
Chris@16: #     define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
Chris@16: #  endif
Chris@16: #else
Chris@16: 
Chris@16: namespace boost{
Chris@16: 
Chris@16: // HP aCC cannot deal with missing names for template value parameters
Chris@16: template <bool x> struct STATIC_ASSERTION_FAILURE;
Chris@16: 
Chris@16: template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
Chris@16: 
Chris@16: // HP aCC cannot deal with missing names for template value parameters
Chris@16: template<int x> struct static_assert_test{};
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: //
Chris@16: // Implicit instantiation requires that all member declarations be
Chris@16: // instantiated, but that the definitions are *not* instantiated.
Chris@16: //
Chris@16: // It's not particularly clear how this applies to enum's or typedefs;
Chris@16: // both are described as declarations [7.1.3] and [7.2] in the standard,
Chris@16: // however some compilers use "delayed evaluation" of one or more of
Chris@16: // these when implicitly instantiating templates.  We use typedef declarations
Chris@16: // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
Chris@16: // version gets better results from your compiler...
Chris@16: //
Chris@16: // Implementation:
Chris@16: // Both of these versions rely on sizeof(incomplete_type) generating an error
Chris@16: // message containing the name of the incomplete type.  We use
Chris@16: // "STATIC_ASSERTION_FAILURE" as the type name here to generate
Chris@16: // an eye catching error message.  The result of the sizeof expression is either
Chris@16: // used as an enum initialiser, or as a template argument depending which version
Chris@16: // is in use...
Chris@16: // Note that the argument to the assert is explicitly cast to bool using old-
Chris@16: // style casts: too many compilers currently have problems with static_cast
Chris@16: // when used inside integral constant expressions.
Chris@16: //
Chris@16: #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
Chris@16: 
Chris@16: #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
Chris@16: // __LINE__ macro broken when -ZI is used see Q199057
Chris@16: // fortunately MSVC ignores duplicate typedef's.
Chris@16: #define BOOST_STATIC_ASSERT( B ) \
Chris@16:    typedef ::boost::static_assert_test<\
Chris@16:       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
Chris@16:       > boost_static_assert_typedef_
Chris@16: #elif defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
Chris@16: #define BOOST_STATIC_ASSERT( B ) \
Chris@16:    typedef ::boost::static_assert_test<\
Chris@16:       sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
Chris@16:          BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
Chris@16: #elif defined(BOOST_MSVC)
Chris@16: #define BOOST_STATIC_ASSERT(...) \
Chris@16:    typedef ::boost::static_assert_test<\
Chris@16:       sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\
Chris@16:          BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
Chris@16: #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND))  && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
Chris@16: // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
Chris@16: // instead of warning in case of failure
Chris@16: # define BOOST_STATIC_ASSERT( B ) \
Chris@16:     typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
Chris@16:         [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
Chris@16: #elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND))  && !defined(BOOST_NO_CXX11_VARIADIC_MACROS)
Chris@16: // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
Chris@16: // instead of warning in case of failure
Chris@16: # define BOOST_STATIC_ASSERT(...) \
Chris@16:     typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
Chris@16:         [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ]
Chris@16: #elif defined(__sgi)
Chris@16: // special version for SGI MIPSpro compiler
Chris@16: #define BOOST_STATIC_ASSERT( B ) \
Chris@16:    BOOST_STATIC_CONSTANT(bool, \
Chris@16:      BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
Chris@16:    typedef ::boost::static_assert_test<\
Chris@16:      sizeof(::boost::STATIC_ASSERTION_FAILURE< \
Chris@16:        BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
Chris@16:          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
Chris@16: #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
Chris@16: // special version for CodeWarrior <= 8.x
Chris@16: #define BOOST_STATIC_ASSERT( B ) \
Chris@16:    BOOST_STATIC_CONSTANT(int, \
Chris@16:      BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
Chris@16:        sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
Chris@16: #else
Chris@16: // generic version
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #     define BOOST_STATIC_ASSERT( ... ) \
Chris@16:          typedef ::boost::static_assert_test<\
Chris@16:             sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\
Chris@16:                BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
Chris@16: #  else
Chris@16: #     define BOOST_STATIC_ASSERT( B ) \
Chris@16:          typedef ::boost::static_assert_test<\
Chris@16:             sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
Chris@16:                BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
Chris@16: #  endif
Chris@16: #endif
Chris@16: 
Chris@16: #else
Chris@16: // alternative enum based implementation:
Chris@16: #  ifndef BOOST_NO_CXX11_VARIADIC_MACROS
Chris@16: #    define BOOST_STATIC_ASSERT( ... ) \
Chris@16:          enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
Chris@16:             = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) }
Chris@16: #  else
Chris@16: #    define BOOST_STATIC_ASSERT(B) \
Chris@16:          enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
Chris@16:             = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
Chris@16: #  endif
Chris@16: #endif
Chris@16: #endif // defined(BOOST_NO_CXX11_STATIC_ASSERT)
Chris@16: 
Chris@16: #endif // BOOST_STATIC_ASSERT_HPP
Chris@16: 
Chris@16: