williamr@2: //  (C) Copyright John Maddock 2000.
williamr@2: //  Use, modification and distribution are subject to the 
williamr@2: //  Boost Software License, Version 1.0. (See accompanying file 
williamr@2: //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
williamr@2: 
williamr@2: //  See http://www.boost.org/libs/static_assert for documentation.
williamr@2: 
williamr@2: /*
williamr@2:  Revision history:
williamr@2:    02 August 2000
williamr@2:       Initial version.
williamr@2: */
williamr@2: 
williamr@2: #ifndef BOOST_STATIC_ASSERT_HPP
williamr@2: #define BOOST_STATIC_ASSERT_HPP
williamr@2: 
williamr@2: #include <boost/config.hpp>
williamr@2: #include <boost/detail/workaround.hpp>
williamr@2: 
williamr@2: #ifdef __BORLANDC__
williamr@2: //
williamr@2: // workaround for buggy integral-constant expression support:
williamr@2: #define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
williamr@2: #endif
williamr@2: 
williamr@2: #if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
williamr@2: // gcc 3.3 and 3.4 don't produce good error messages with the default version:
williamr@2: #  define BOOST_SA_GCC_WORKAROUND
williamr@2: #endif
williamr@2: 
williamr@2: namespace boost{
williamr@2: 
williamr@2: // HP aCC cannot deal with missing names for template value parameters
williamr@2: template <bool x> struct STATIC_ASSERTION_FAILURE;
williamr@2: 
williamr@2: template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
williamr@2: 
williamr@2: // HP aCC cannot deal with missing names for template value parameters
williamr@2: template<int x> struct static_assert_test{};
williamr@2: 
williamr@2: }
williamr@2: 
williamr@2: //
williamr@2: // Implicit instantiation requires that all member declarations be
williamr@2: // instantiated, but that the definitions are *not* instantiated.
williamr@2: //
williamr@2: // It's not particularly clear how this applies to enum's or typedefs;
williamr@2: // both are described as declarations [7.1.3] and [7.2] in the standard,
williamr@2: // however some compilers use "delayed evaluation" of one or more of
williamr@2: // these when implicitly instantiating templates.  We use typedef declarations
williamr@2: // by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
williamr@2: // version gets better results from your compiler...
williamr@2: //
williamr@2: // Implementation:
williamr@2: // Both of these versions rely on sizeof(incomplete_type) generating an error
williamr@2: // message containing the name of the incomplete type.  We use
williamr@2: // "STATIC_ASSERTION_FAILURE" as the type name here to generate
williamr@2: // an eye catching error message.  The result of the sizeof expression is either
williamr@2: // used as an enum initialiser, or as a template argument depending which version
williamr@2: // is in use...
williamr@2: // Note that the argument to the assert is explicitly cast to bool using old-
williamr@2: // style casts: too many compilers currently have problems with static_cast
williamr@2: // when used inside integral constant expressions.
williamr@2: //
williamr@2: #if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
williamr@2: 
williamr@2: #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
williamr@2: // __LINE__ macro broken when -ZI is used see Q199057
williamr@2: // fortunately MSVC ignores duplicate typedef's.
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    typedef ::boost::static_assert_test<\
williamr@2:       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
williamr@2:       > boost_static_assert_typedef_
williamr@2: #elif defined(BOOST_MSVC)
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    typedef ::boost::static_assert_test<\
williamr@2:       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
williamr@2:          BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
williamr@2: #elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
williamr@2: // agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
williamr@2: // instead of warning in case of failure
williamr@2: # define BOOST_STATIC_ASSERT( B ) \
williamr@2:     typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
williamr@2:         [ ::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >::value ]
williamr@2: #elif defined(__sgi)
williamr@2: // special version for SGI MIPSpro compiler
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    BOOST_STATIC_CONSTANT(bool, \
williamr@2:      BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
williamr@2:    typedef ::boost::static_assert_test<\
williamr@2:      sizeof(::boost::STATIC_ASSERTION_FAILURE< \
williamr@2:        BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
williamr@2:          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
williamr@2: #elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
williamr@2: // special version for CodeWarrior <= 8.x
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    BOOST_STATIC_CONSTANT(int, \
williamr@2:      BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
williamr@2:        sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) )
williamr@2: #else
williamr@2: // generic version
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    typedef ::boost::static_assert_test<\
williamr@2:       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
williamr@2:          BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
williamr@2: #endif
williamr@2: 
williamr@2: #else
williamr@2: // alternative enum based implementation:
williamr@2: #define BOOST_STATIC_ASSERT( B ) \
williamr@2:    enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
williamr@2:       = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
williamr@2: #endif
williamr@2: 
williamr@2: 
williamr@2: #endif // BOOST_STATIC_ASSERT_HPP
williamr@2: 
williamr@2: