// (C) Copyright John Maddock 2000.
-// Permission to copy, use, modify, sell and
-// distribute this software is granted provided this copyright notice appears
-// in all copies. This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-// See http://www.boost.org for most recent version including documentation.
+// See http://www.boost.org/libs/static_assert for documentation.
/*
Revision history:
- 02 August 2000
- Initial version.
+ 02 August 2000
+ Initial version.
*/
#ifndef BOOST_STATIC_ASSERT_HPP
#define BOOST_STATIC_ASSERT_HPP
#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#if defined(__GNUC__) && !defined(__GXX_EXPERIMENTAL_CXX0X__)
+//
+// This is horrible, but it seems to be the only we can shut up the
+// "anonymous variadic macros were introduced in C99 [-Wvariadic-macros]"
+// warning that get spewed out otherwise in non-C++11 mode.
+//
+#pragma GCC system_header
+#endif
+
+#ifndef BOOST_NO_CXX11_STATIC_ASSERT
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT_MSG( ... ) static_assert(__VA_ARGS__)
+# else
+# define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
+# endif
+#else
+# define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
+#endif
#ifdef __BORLANDC__
//
#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
#endif
+#if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
+// gcc 3.3 and 3.4 don't produce good error messages with the default version:
+# define BOOST_SA_GCC_WORKAROUND
+#endif
+
+//
+// If the compiler issues warnings about old C style casts,
+// then enable this:
+//
+#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) ((__VA_ARGS__) == 0 ? false : true)
+# else
+# define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
+# endif
+#else
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT_BOOL_CAST( ... ) (bool)(__VA_ARGS__)
+# else
+# define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
+# endif
+#endif
+//
+// If the compiler warns about unused typedefs then enable this:
+//
+#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 7)))
+# define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE __attribute__((unused))
+#else
+# define BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
+#endif
+
+#ifndef BOOST_NO_CXX11_STATIC_ASSERT
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT( ... ) static_assert(__VA_ARGS__, #__VA_ARGS__)
+# else
+# define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
+# endif
+#else
+
namespace boost{
// HP aCC cannot deal with missing names for template value parameters
template <bool x> struct STATIC_ASSERTION_FAILURE;
-template <> struct STATIC_ASSERTION_FAILURE<true>{};
+template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
// HP aCC cannot deal with missing names for template value parameters
template<int x> struct static_assert_test{};
// an eye catching error message. The result of the sizeof expression is either
// used as an enum initialiser, or as a template argument depending which version
// is in use...
+// Note that the argument to the assert is explicitly cast to bool using old-
+// style casts: too many compilers currently have problems with static_cast
+// when used inside integral constant expressions.
//
-#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS) && !defined(__MWERKS__)
-#ifndef BOOST_MSVC
-#define BOOST_STATIC_ASSERT( B ) \
- typedef ::boost::static_assert_test<\
- sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
- BOOST_ASSERT_JOIN(boost_static_assert_typedef_, __LINE__)
-#else
+#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
+
+#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
// __LINE__ macro broken when -ZI is used see Q199057
// fortunately MSVC ignores duplicate typedef's.
#define BOOST_STATIC_ASSERT( B ) \
typedef ::boost::static_assert_test<\
sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
> boost_static_assert_typedef_
+#elif defined(BOOST_MSVC) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
+#define BOOST_STATIC_ASSERT( B ) \
+ typedef ::boost::static_assert_test<\
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
+ BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
+#elif defined(BOOST_MSVC)
+#define BOOST_STATIC_ASSERT(...) \
+ typedef ::boost::static_assert_test<\
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST (__VA_ARGS__) >)>\
+ BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
+#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && defined(BOOST_NO_CXX11_VARIADIC_MACROS)
+// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
+// instead of warning in case of failure
+# define BOOST_STATIC_ASSERT( B ) \
+ typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
+ [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
+#elif (defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)) && !defined(BOOST_NO_CXX11_VARIADIC_MACROS)
+// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
+// instead of warning in case of failure
+# define BOOST_STATIC_ASSERT(...) \
+ typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
+ [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >::value ]
+#elif defined(__sgi)
+// special version for SGI MIPSpro compiler
+#define BOOST_STATIC_ASSERT( B ) \
+ BOOST_STATIC_CONSTANT(bool, \
+ BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
+ typedef ::boost::static_assert_test<\
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< \
+ BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
+ BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
+#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
+// special version for CodeWarrior <= 8.x
+#define BOOST_STATIC_ASSERT( B ) \
+ BOOST_STATIC_CONSTANT(int, \
+ BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
+#else
+// generic version
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT( ... ) \
+ typedef ::boost::static_assert_test<\
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( __VA_ARGS__ ) >)>\
+ BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
+# else
+# define BOOST_STATIC_ASSERT( B ) \
+ typedef ::boost::static_assert_test<\
+ sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
+ BOOST_JOIN(boost_static_assert_typedef_, __LINE__) BOOST_STATIC_ASSERT_UNUSED_ATTRIBUTE
+# endif
#endif
+
#else
// alternative enum based implementation:
-#define BOOST_STATIC_ASSERT( B ) \
- enum { BOOST_ASSERT_JOIN(boost_static_assert_enum_, __LINE__) \
- = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
+# ifndef BOOST_NO_CXX11_VARIADIC_MACROS
+# define BOOST_STATIC_ASSERT( ... ) \
+ enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
+ = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( __VA_ARGS__ ) >) }
+# else
+# define BOOST_STATIC_ASSERT(B) \
+ enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
+ = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
+# endif
#endif
-
-//
-// The following piece of macro magic joins the two
-// arguments together, even when one of the arguments is
-// itself a macro (see 16.3.1 in C++ standard). The key
-// is that macro expansion of macro arguments does not
-// occur in BOOST_DO_ASSERT_JOIN but does in BOOST_ASSERT_JOIN
-// provided it is called from within another macro.
-#define BOOST_ASSERT_JOIN( X, Y ) BOOST_DO_ASSERT_JOIN( X, Y )
-#define BOOST_DO_ASSERT_JOIN( X, Y ) X##Y
+#endif // defined(BOOST_NO_CXX11_STATIC_ASSERT)
#endif // BOOST_STATIC_ASSERT_HPP
-
-
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