/Src/Dependencies/Boost/boost/static_assert.hpp

  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#ifndef BOOST_NO_STATIC_ASSERT
 21#  define BOOST_STATIC_ASSERT_MSG( B, Msg ) static_assert(B, Msg)
 22#else
 23#  define BOOST_STATIC_ASSERT_MSG( B, Msg ) BOOST_STATIC_ASSERT( B )
 24#endif
 25
 26#ifdef __BORLANDC__
 27//
 28// workaround for buggy integral-constant expression support:
 29#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
 30#endif
 31
 32#if defined(__GNUC__) && (__GNUC__ == 3) && ((__GNUC_MINOR__ == 3) || (__GNUC_MINOR__ == 4))
 33// gcc 3.3 and 3.4 don't produce good error messages with the default version:
 34#  define BOOST_SA_GCC_WORKAROUND
 35#endif
 36
 37//
 38// If the compiler issues warnings about old C style casts,
 39// then enable this:
 40//
 41#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 4)))
 42#  define BOOST_STATIC_ASSERT_BOOL_CAST( x ) ((x) == 0 ? false : true)
 43#else
 44#  define BOOST_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
 45#endif
 46
 47#ifndef BOOST_NO_STATIC_ASSERT
 48#  define BOOST_STATIC_ASSERT( B ) static_assert(B, #B)
 49#else
 50
 51namespace boost{
 52
 53// HP aCC cannot deal with missing names for template value parameters
 54template <bool x> struct STATIC_ASSERTION_FAILURE;
 55
 56template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
 57
 58// HP aCC cannot deal with missing names for template value parameters
 59template<int x> struct static_assert_test{};
 60
 61}
 62
 63//
 64// Implicit instantiation requires that all member declarations be
 65// instantiated, but that the definitions are *not* instantiated.
 66//
 67// It's not particularly clear how this applies to enum's or typedefs;
 68// both are described as declarations [7.1.3] and [7.2] in the standard,
 69// however some compilers use "delayed evaluation" of one or more of
 70// these when implicitly instantiating templates.  We use typedef declarations
 71// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
 72// version gets better results from your compiler...
 73//
 74// Implementation:
 75// Both of these versions rely on sizeof(incomplete_type) generating an error
 76// message containing the name of the incomplete type.  We use
 77// "STATIC_ASSERTION_FAILURE" as the type name here to generate
 78// an eye catching error message.  The result of the sizeof expression is either
 79// used as an enum initialiser, or as a template argument depending which version
 80// is in use...
 81// Note that the argument to the assert is explicitly cast to bool using old-
 82// style casts: too many compilers currently have problems with static_cast
 83// when used inside integral constant expressions.
 84//
 85#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
 86
 87#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
 88// __LINE__ macro broken when -ZI is used see Q199057
 89// fortunately MSVC ignores duplicate typedef's.
 90#define BOOST_STATIC_ASSERT( B ) \
 91   typedef ::boost::static_assert_test<\
 92      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
 93      > boost_static_assert_typedef_
 94#elif defined(BOOST_MSVC)
 95#define BOOST_STATIC_ASSERT( B ) \
 96   typedef ::boost::static_assert_test<\
 97      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST ( B ) >)>\
 98         BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
 99#elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
100// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
101// instead of warning in case of failure
102# define BOOST_STATIC_ASSERT( B ) \
103    typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
104        [ ::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >::value ]
105#elif defined(__sgi)
106// special version for SGI MIPSpro compiler
107#define BOOST_STATIC_ASSERT( B ) \
108   BOOST_STATIC_CONSTANT(bool, \
109     BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
110   typedef ::boost::static_assert_test<\
111     sizeof(::boost::STATIC_ASSERTION_FAILURE< \
112       BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
113         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
114#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
115// special version for CodeWarrior <= 8.x
116#define BOOST_STATIC_ASSERT( B ) \
117   BOOST_STATIC_CONSTANT(int, \
118     BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
119       sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >) )
120#else
121// generic version
122#define BOOST_STATIC_ASSERT( B ) \
123   typedef ::boost::static_assert_test<\
124      sizeof(::boost::STATIC_ASSERTION_FAILURE< BOOST_STATIC_ASSERT_BOOL_CAST( B ) >)>\
125         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
126#endif
127
128#else
129// alternative enum based implementation:
130#define BOOST_STATIC_ASSERT( B ) \
131   enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
132      = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
133#endif
134#endif // defined(BOOST_NO_STATIC_ASSERT)
135
136#endif // BOOST_STATIC_ASSERT_HPP
137
138