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