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b9a9f9fca1
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@2080 a592a061-630c-0410-9148-cb99ea01b6c8
96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
// (C) Copyright John Maddock 2000.
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// Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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// See http://www.boost.org for most recent version including 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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#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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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>{};
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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) && !defined(__MWERKS__)
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#ifndef 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< (bool)( B ) >)>\
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BOOST_ASSERT_JOIN(boost_static_assert_typedef_, __LINE__)
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#else
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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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#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_ASSERT_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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//
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// The following piece of macro magic joins the two
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// arguments together, even when one of the arguments is
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// itself a macro (see 16.3.1 in C++ standard). The key
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// is that macro expansion of macro arguments does not
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// occur in BOOST_DO_ASSERT_JOIN but does in BOOST_ASSERT_JOIN
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// provided it is called from within another macro.
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#define BOOST_ASSERT_JOIN( X, Y ) BOOST_DO_ASSERT_JOIN( X, Y )
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#define BOOST_DO_ASSERT_JOIN( X, Y ) X##Y
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#endif // BOOST_STATIC_ASSERT_HPP
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