boost/type_traits/intrinsics.hpp

   1
   2 //  (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6 //
   7 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
   8
   9 #ifndef BOOST_TT_INTRINSICS_HPP_INCLUDED
  10 #define BOOST_TT_INTRINSICS_HPP_INCLUDED
  11
  12 #ifndef BOOST_TT_CONFIG_HPP_INCLUDED
  13 #include <boost/type_traits/config.hpp>
  14 #endif
  15
  16 //
  17 // Helper macros for builtin compiler support.
  18 // If your compiler has builtin support for any of the following
  19 // traits concepts, then redefine the appropriate macros to pick
  20 // up on the compiler support:
  21 //
  22 // (these should largely ignore cv-qualifiers)
  23 // BOOST_IS_UNION(T) should evaluate to true if T is a union type
  24 // BOOST_IS_POD(T) should evaluate to true if T is a POD type
  25 // BOOST_IS_EMPTY(T) should evaluate to true if T is an empty struct or union
  26 // BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) should evaluate to true if "T x;" has no effect
  27 // BOOST_HAS_TRIVIAL_COPY(T) should evaluate to true if T(t) <==> memcpy
  28 // BOOST_HAS_TRIVIAL_ASSIGN(T) should evaluate to true if t = u <==> memcpy
  29 // BOOST_HAS_TRIVIAL_DESTRUCTOR(T) should evaluate to true if ~T() has no effect
  30 // BOOST_HAS_NOTHROW_CONSTRUCTOR(T) should evaluate to true if "T x;" can not throw
  31 // BOOST_HAS_NOTHROW_COPY(T) should evaluate to true if T(t) can not throw
  32 // BOOST_HAS_NOTHROW_ASSIGN(T) should evaluate to true if t = u can not throw
  33 // BOOST_HAS_VIRTUAL_DESTRUCTOR(T) should evaluate to true T has a virtual destructor
  34 //
  35 // The following can also be defined: when detected our implementation is greatly simplified.
  36 // Note that unlike the macros above these do not have default definitions, so we can use
  37 // #ifdef MACRONAME to detect when these are available.
  38 //
  39 // BOOST_IS_ABSTRACT(T) true if T is an abstract type
  40 // BOOST_IS_BASE_OF(T,U) true if T is a base class of U
  41 // BOOST_IS_CLASS(T) true if T is a class type
  42 // BOOST_IS_CONVERTIBLE(T,U) true if T is convertible to U
  43 // BOOST_IS_ENUM(T) true is T is an enum
  44 // BOOST_IS_POLYMORPHIC(T) true if T is a polymorphic type
  45 // BOOST_ALIGNMENT_OF(T) should evaluate to the alignment requirements of type T.
  46
  47 #ifdef BOOST_HAS_SGI_TYPE_TRAITS
  48     // Hook into SGI's __type_traits class, this will pick up user supplied
  49     // specializations as well as SGI - compiler supplied specializations.
  50 #   include <boost/type_traits/is_same.hpp>
  51 #   ifdef __NetBSD__
  52       // There are two different versions of type_traits.h on NetBSD on Spark
  53       // use an implicit include via algorithm instead, to make sure we get
  54       // the same version as the std lib:
  55 #     include <algorithm>
  56 #   else
  57 #    include <type_traits.h>
  58 #   endif
  59 #   define BOOST_IS_POD(T) ::boost::is_same< typename ::__type_traits<T>::is_POD_type, ::__true_type>::value
  60 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_default_constructor, ::__true_type>::value
  61 #   define BOOST_HAS_TRIVIAL_COPY(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_copy_constructor, ::__true_type>::value
  62 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_assignment_operator, ::__true_type>::value
  63 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) ::boost::is_same< typename ::__type_traits<T>::has_trivial_destructor, ::__true_type>::value
  64
  65 #   ifdef __sgi
  66 #      define BOOST_HAS_TYPE_TRAITS_INTRINSICS
  67 #   endif
  68 #endif
  69
  70 #if defined(__MSL_CPP__) && (__MSL_CPP__ >= 0x8000)
  71     // Metrowerks compiler is acquiring intrinsic type traits support
  72     // post version 8.  We hook into the published interface to pick up
  73     // user defined specializations as well as compiler intrinsics as
  74     // and when they become available:
  75 #   include <msl_utility>
  76 #   define BOOST_IS_UNION(T) BOOST_STD_EXTENSION_NAMESPACE::is_union<T>::value
  77 #   define BOOST_IS_POD(T) BOOST_STD_EXTENSION_NAMESPACE::is_POD<T>::value
  78 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_default_ctor<T>::value
  79 #   define BOOST_HAS_TRIVIAL_COPY(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_copy_ctor<T>::value
  80 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_assignment<T>::value
  81 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_dtor<T>::value
  82 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
  83 #endif
  84
  85 #if defined(BOOST_MSVC) && defined(_MSC_FULL_VER) && (_MSC_FULL_VER >=140050215)
  86 #   include <boost/type_traits/is_same.hpp>
  87
  88 #   define BOOST_IS_UNION(T) __is_union(T)
  89 #   define BOOST_IS_POD(T) (__is_pod(T) && __has_trivial_constructor(T))
  90 #   define BOOST_IS_EMPTY(T) __is_empty(T)
  91 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) __has_trivial_constructor(T)
  92 #   define BOOST_HAS_TRIVIAL_COPY(T) __has_trivial_copy(T)
  93 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) __has_trivial_assign(T)
  94 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
  95 #   define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) __has_nothrow_constructor(T)
  96 #   define BOOST_HAS_NOTHROW_COPY(T) __has_nothrow_copy(T)
  97 #   define BOOST_HAS_NOTHROW_ASSIGN(T) __has_nothrow_assign(T)
  98 #   define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
  99
 100 #   define BOOST_IS_ABSTRACT(T) __is_abstract(T)
 101 #   define BOOST_IS_BASE_OF(T,U) (__is_base_of(T,U) && !is_same<T,U>::value)
 102 #   define BOOST_IS_CLASS(T) __is_class(T)
 103 //  This one doesn't quite always do the right thing:
 104 //  #   define BOOST_IS_CONVERTIBLE(T,U) __is_convertible_to(T,U)
 105 #   define BOOST_IS_ENUM(T) __is_enum(T)
 106 //  This one doesn't quite always do the right thing:
 107 //  #   define BOOST_IS_POLYMORPHIC(T) __is_polymorphic(T)
 108 //  This one fails if the default alignment has been changed with /Zp:
 109 //  #   define BOOST_ALIGNMENT_OF(T) __alignof(T)
 110
 111 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
 112 #endif
 113
 114 #if defined(__DMC__) && (__DMC__ >= 0x848)
 115 // For Digital Mars C++, www.digitalmars.com
 116 #   define BOOST_IS_UNION(T) (__typeinfo(T) & 0x400)
 117 #   define BOOST_IS_POD(T) (__typeinfo(T) & 0x800)
 118 #   define BOOST_IS_EMPTY(T) (__typeinfo(T) & 0x1000)
 119 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) (__typeinfo(T) & 0x10)
 120 #   define BOOST_HAS_TRIVIAL_COPY(T) (__typeinfo(T) & 0x20)
 121 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) (__typeinfo(T) & 0x40)
 122 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) (__typeinfo(T) & 0x8)
 123 #   define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) (__typeinfo(T) & 0x80)
 124 #   define BOOST_HAS_NOTHROW_COPY(T) (__typeinfo(T) & 0x100)
 125 #   define BOOST_HAS_NOTHROW_ASSIGN(T) (__typeinfo(T) & 0x200)
 126 #   define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) (__typeinfo(T) & 0x4)
 127 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
 128 #endif
 129
 130 #if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3) && !defined(__GCCXML__)))
 131 #   include <boost/type_traits/is_same.hpp>
 132 #   include <boost/type_traits/is_reference.hpp>
 133 #   include <boost/type_traits/is_volatile.hpp>
 134
 135 #   define BOOST_IS_UNION(T) __is_union(T)
 136 #   define BOOST_IS_POD(T) __is_pod(T)
 137 #   define BOOST_IS_EMPTY(T) __is_empty(T)
 138 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) __has_trivial_constructor(T)
 139 #   define BOOST_HAS_TRIVIAL_COPY(T) (__has_trivial_copy(T) && !is_reference<T>::value)
 140 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) __has_trivial_assign(T)
 141 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
 142 #   define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) __has_nothrow_constructor(T)
 143 #   define BOOST_HAS_NOTHROW_COPY(T) (__has_nothrow_copy(T) && !is_volatile<T>::value && !is_reference<T>::value)
 144 #   define BOOST_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T) && !is_volatile<T>::value)
 145 #   define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
 146
 147 #   define BOOST_IS_ABSTRACT(T) __is_abstract(T)
 148 #   define BOOST_IS_BASE_OF(T,U) (__is_base_of(T,U) && !is_same<T,U>::value)
 149 #   define BOOST_IS_CLASS(T) __is_class(T)
 150 #   define BOOST_IS_ENUM(T) __is_enum(T)
 151 #   define BOOST_IS_POLYMORPHIC(T) __is_polymorphic(T)
 152 #   if !defined(unix) || defined(__LP64__)
 153       // GCC sometimes lies about alignment requirements
 154       // of type double on 32-bit unix platforms, use the
 155       // old implementation instead in that case:
 156 #     define BOOST_ALIGNMENT_OF(T) __alignof__(T)
 157 #   endif
 158
 159 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
 160 #endif
 161
 162 # if defined(__CODEGEARC__)
 163 #   include <boost/type_traits/is_same.hpp>
 164 #   include <boost/type_traits/is_reference.hpp>
 165 #   include <boost/type_traits/is_volatile.hpp>
 166 #   include <boost/type_traits/is_void.hpp>
 167
 168 #   define BOOST_IS_UNION(T) __is_union(T)
 169 #   define BOOST_IS_POD(T) __is_pod(T)
 170 #   define BOOST_IS_EMPTY(T) __is_empty(T)
 171 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) (__has_trivial_default_constructor(T) || is_void<T>::value)
 172 #   define BOOST_HAS_TRIVIAL_COPY(T) (__has_trivial_copy_constructor(T) && !is_volatile<T>::value && !is_reference<T>::value || is_void<T>::value)
 173 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) (__has_trivial_assign(T) && !is_volatile<T>::value || is_void<T>::value)
 174 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) (__has_trivial_destructor(T) || is_void<T>::value)
 175 #   define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) (__has_nothrow_default_constructor(T) || is_void<T>::value)
 176 #   define BOOST_HAS_NOTHROW_COPY(T) (__has_nothrow_copy_constructor(T) && !is_volatile<T>::value && !is_reference<T>::value || is_void<T>::value)
 177 #   define BOOST_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T) && !is_volatile<T>::value || is_void<T>::value)
 178 #   define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
 179
 180 #   define BOOST_IS_ABSTRACT(T) __is_abstract(T)
 181 #   define BOOST_IS_BASE_OF(T,U) (__is_base_of(T,U) && !is_void<T>::value && !is_void<U>::value)
 182 #   define BOOST_IS_CLASS(T) __is_class(T)
 183 #   define BOOST_IS_CONVERTIBLE(T,U) (__is_convertible(T,U) || is_void<U>::value)
 184 #   define BOOST_IS_ENUM(T) __is_enum(T)
 185 #   define BOOST_IS_POLYMORPHIC(T) __is_polymorphic(T)
 186 #   define BOOST_ALIGNMENT_OF(T) alignof(T)
 187
 188 #   define BOOST_HAS_TYPE_TRAITS_INTRINSICS
 189 #endif
 190
 191 #ifndef BOOST_IS_UNION
 192 #   define BOOST_IS_UNION(T) false
 193 #endif
 194
 195 #ifndef BOOST_IS_POD
 196 #   define BOOST_IS_POD(T) false
 197 #endif
 198
 199 #ifndef BOOST_IS_EMPTY
 200 #   define BOOST_IS_EMPTY(T) false
 201 #endif
 202
 203 #ifndef BOOST_HAS_TRIVIAL_CONSTRUCTOR
 204 #   define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) false
 205 #endif
 206
 207 #ifndef BOOST_HAS_TRIVIAL_COPY
 208 #   define BOOST_HAS_TRIVIAL_COPY(T) false
 209 #endif
 210
 211 #ifndef BOOST_HAS_TRIVIAL_ASSIGN
 212 #   define BOOST_HAS_TRIVIAL_ASSIGN(T) false
 213 #endif
 214
 215 #ifndef BOOST_HAS_TRIVIAL_DESTRUCTOR
 216 #   define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) false
 217 #endif
 218
 219 #ifndef BOOST_HAS_NOTHROW_CONSTRUCTOR
 220 #   define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) false
 221 #endif
 222
 223 #ifndef BOOST_HAS_NOTHROW_COPY
 224 #   define BOOST_HAS_NOTHROW_COPY(T) false
 225 #endif
 226
 227 #ifndef BOOST_HAS_NOTHROW_ASSIGN
 228 #   define BOOST_HAS_NOTHROW_ASSIGN(T) false
 229 #endif
 230
 231 #ifndef BOOST_HAS_VIRTUAL_DESTRUCTOR
 232 #   define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) false
 233 #endif
 234
 235 #endif // BOOST_TT_INTRINSICS_HPP_INCLUDED
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