source: NonGTP/Boost/boost/static_assert.hpp @ 857

Revision 857, 4.5 KB checked in by igarcia, 19 years ago (diff)
Line 
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
31namespace boost{
32
33// HP aCC cannot deal with missing names for template value parameters
34template <bool x> struct STATIC_ASSERTION_FAILURE;
35
36template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
37
38// HP aCC cannot deal with missing names for template value parameters
39template<int x> struct static_assert_test{};
40
41}
42
43//
44// Implicit instantiation requires that all member declarations be
45// instantiated, but that the definitions are *not* instantiated.
46//
47// It's not particularly clear how this applies to enum's or typedefs;
48// both are described as declarations [7.1.3] and [7.2] in the standard,
49// however some compilers use "delayed evaluation" of one or more of
50// these when implicitly instantiating templates.  We use typedef declarations
51// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
52// version gets better results from your compiler...
53//
54// Implementation:
55// Both of these versions rely on sizeof(incomplete_type) generating an error
56// message containing the name of the incomplete type.  We use
57// "STATIC_ASSERTION_FAILURE" as the type name here to generate
58// an eye catching error message.  The result of the sizeof expression is either
59// used as an enum initialiser, or as a template argument depending which version
60// is in use...
61// Note that the argument to the assert is explicitly cast to bool using old-
62// style casts: too many compilers currently have problems with static_cast
63// when used inside integral constant expressions.
64//
65#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS)
66
67#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
68// __LINE__ macro broken when -ZI is used see Q199057
69// fortunately MSVC ignores duplicate typedef's.
70#define BOOST_STATIC_ASSERT( B ) \
71   typedef ::boost::static_assert_test<\
72      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
73      > boost_static_assert_typedef_
74#elif defined(BOOST_MSVC)
75#define BOOST_STATIC_ASSERT( B ) \
76   typedef ::boost::static_assert_test<\
77      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
78         BOOST_JOIN(boost_static_assert_typedef_, __COUNTER__)
79#elif defined(BOOST_INTEL_CXX_VERSION) || defined(BOOST_SA_GCC_WORKAROUND)
80// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error
81// instead of warning in case of failure
82# define BOOST_STATIC_ASSERT( B ) \
83    typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
84        [ ::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >::value ]
85#elif defined(__sgi)
86// special version for SGI MIPSpro compiler
87#define BOOST_STATIC_ASSERT( B ) \
88   BOOST_STATIC_CONSTANT(bool, \
89     BOOST_JOIN(boost_static_assert_test_, __LINE__) = ( B )); \
90   typedef ::boost::static_assert_test<\
91     sizeof(::boost::STATIC_ASSERTION_FAILURE< \
92       BOOST_JOIN(boost_static_assert_test_, __LINE__) >)>\
93         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
94#elif BOOST_WORKAROUND(__MWERKS__, <= 0x3003)
95// special version for CodeWarrior <= 8.x
96#define BOOST_STATIC_ASSERT( B ) \
97   BOOST_STATIC_CONSTANT(int, \
98     BOOST_JOIN(boost_static_assert_test_, __LINE__) = \
99       sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) )
100#else
101// generic version
102#define BOOST_STATIC_ASSERT( B ) \
103   typedef ::boost::static_assert_test<\
104      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
105         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
106#endif
107
108#else
109// alternative enum based implementation:
110#define BOOST_STATIC_ASSERT( B ) \
111   enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
112      = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
113#endif
114
115
116#endif // BOOST_STATIC_ASSERT_HPP
117
118
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