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/src/contrib/boost/static_assert.hpp

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C++ Header | 132 lines | 64 code | 19 blank | 49 comment | 13 complexity | d42f6fe636a21b3d7e34de9bada47fa7 MD5 | raw file
  1//  (C) Copyright John Maddock 2000.
  2//  Use, modification and distribution are subject to the 
  3//  Boost Software License, Version 1.0. (See accompanying file 
  4//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  5
  6//  See http://www.boost.org/libs/static_assert for documentation.
  7
  8/*
  9 Revision history:
 10   02 August 2000
 11      Initial version.
 12*/
 13
 14#ifndef BOOST_STATIC_ASSERT_HPP
 15#define BOOST_STATIC_ASSERT_HPP
 16
 17#include <boost/config.hpp>
 18#include <boost/detail/workaround.hpp>
 19
 20#ifdef __BORLANDC__
 21//
 22// workaround for buggy integral-constant expression support:
 23#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
 24#endif
 25
 26#if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
 27// gcc 3.3 and 3.4 don't produce good error messages with the default version:
 28#  define BOOST_SA_GCC_WORKAROUND
 29#endif
 30
 31//
 32// If the compiler issues warnings about old C style casts,
 33// then enable this:
 34//
 35#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
 36#  define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
 37#else
 38#  define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
 39#endif
 40
 41#ifdef BOOST_HAS_STATIC_ASSERT
 42#  define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
 43#else
 44
 45namespace boost{
 46
 47// HP aCC cannot deal with missing names for template value parameters
 48template <bool x> struct STATIC_ASSERTION_FAILURE;
 49
 50template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
 51
 52// HP aCC cannot deal with missing names for template value parameters
 53template<int x> struct static_assert_test{};
 54
 55}
 56
 57//
 58// Implicit instantiation requires that all member declarations be
 59// instantiated, but that the definitions are *not* instantiated.
 60//
 61// It's not particularly clear how this applies to enum's or typedefs;
 62// both are described as declarations [7.1.3] and [7.2] in the standard,
 63// however some compilers use "delayed evaluation" of one or more of
 64// these when implicitly instantiating templates.  We use typedef declarations
 65// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
 66// version gets better results from your compiler...
 67//
 68// Implementation:
 69// Both of these versions rely on sizeof(incomplete_type) generating an error
 70// message containing the name of the incomplete type.  We use
 71// "STATIC_ASSERTION_FAILURE" as the type name here to generate
 72// an eye catching error message.  The result of the sizeof expression is either
 73// used as an enum initialiser, or as a template argument depending which version
 74// is in use...
 75// Note that the argument to the assert is explicitly cast to bool using old-
 76// style casts: too many compilers currently have problems with static_cast
 77// when used inside integral constant expressions.
 78//
 79#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
 80
 81#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
 82// __LINE__ macro broken when -ZI is used see Q199057
 83// fortunately MSVC ignores duplicate typedef's.
 84#define BOOST_STATIC_ASSERT( B ) \
 85   typedef ::boost::static_assert_test<\
 86      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
 87      > boost_static_assert_typedef_
 88#elif defined(BOOST_MSVC)
 89#define BOOST_STATIC_ASSERT( B ) \
 90   typedef ::boost::static_assert_test<\
 91      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
 92         BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
 93#elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
 94// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
 95// instead of warning in case of failure
 96# define BOOST_STATIC_ASSERT( B ) \
 97    typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
 98        [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
 99#elif defined(__sgi)
100// special version for SGI MIPSpro compiler
101#define BOOST_STATIC_ASSERT( B ) \
102   BOOST_STATIC_CONSTANT(bool, \
103     BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
104   typedef ::boost::static_assert_test<\
105     sizeof(::boost::STATIC_ASSERTION_FAILURE< \
106       BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
107         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
108#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
109// special version for CodeWarrior <= 8.x
110#define BOOST_STATIC_ASSERT( B ) \
111   BOOST_STATIC_CONSTANT(int, \
112     BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
113       sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
114#else
115// generic version
116#define BOOST_STATIC_ASSERT( B ) \
117   typedef ::boost::static_assert_test<\
118      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
119         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
120#endif
121
122#else
123// alternative enum based implementation:
124#define BOOST_STATIC_ASSERT( B ) \
125   enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
126      = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
127#endif
128#endif // ndef BOOST_HAS_STATIC_ASSERT
129
130#endif // BOOST_STATIC_ASSERT_HPP
131
132