libstdc++-v3/testsuite/20_util/variable_templates_for_traits.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile }
   3
   4 // Copyright (C) 2014-2018 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <type_traits>
  22
  23 using namespace std;
  24
  25 // These tests are rather simple, the front-end tests already test
  26 // variable templates, and the library tests for the underlying
  27 // traits are more elaborate. These are just simple sanity tests.
  28
  29 static_assert(is_void_v<void> && is_void<void>::value, "");
  30 static_assert(!is_void_v<int> && !is_void<int>::value, "");
  31
  32 static_assert(is_null_pointer_v<nullptr_t>
  33               && is_null_pointer<nullptr_t>::value, "");
  34 static_assert(!is_null_pointer_v<void*>
  35               && !is_null_pointer<void*>::value, "");
  36
  37 static_assert(is_integral_v<int> && is_integral<int>::value, "");
  38 static_assert(!is_integral_v<int*> && !is_integral<int*>::value, "");
  39
  40 static_assert(is_floating_point_v<float>
  41               && is_floating_point<float>::value, "");
  42 static_assert(!is_floating_point_v<int>
  43               && !is_floating_point<int>::value, "");
  44
  45 static_assert(is_array_v<char[42]> && is_array<char[42]>::value, "");
  46 static_assert(!is_array_v<char*> && !is_array<char*>::value, "");
  47
  48 static_assert(is_pointer_v<int*> && is_pointer<int*>::value, "");
  49 static_assert(!is_pointer_v<int> && !is_pointer<int>::value, "");
  50
  51 static_assert(is_lvalue_reference_v<int&>
  52               && is_lvalue_reference<int&>::value, "");
  53 static_assert(!is_lvalue_reference_v<int>
  54               && !is_lvalue_reference<int>::value, "");
  55
  56 static_assert(is_rvalue_reference_v<int&&>
  57               && is_rvalue_reference<int&&>::value, "");
  58 static_assert(!is_rvalue_reference_v<int>
  59               && !is_rvalue_reference<int>::value, "");
  60
  61 struct EmptyFinal final {};
  62
  63 static_assert(is_member_object_pointer_v<int (EmptyFinal::*)>
  64               && is_member_object_pointer<int (EmptyFinal::*)>::value, "");
  65 static_assert(!is_member_object_pointer_v<void*>
  66               && !is_member_object_pointer<void*>::value, "");
  67
  68 static_assert(is_member_function_pointer_v<int (EmptyFinal::*)()>
  69               && is_member_function_pointer<int (EmptyFinal::*)()>::value, "");
  70 static_assert(!is_member_function_pointer_v<void*>
  71               && !is_member_function_pointer<void*>::value, "");
  72
  73 enum Enum {};
  74
  75 static_assert(is_enum_v<Enum> && is_enum<Enum>::value, "");
  76 static_assert(!is_enum_v<int> && !is_enum<int>::value, "");
  77
  78 union Union;
  79
  80 static_assert(is_union_v<Union> && is_union<Union>::value, "");
  81 static_assert(!is_union_v<int> && !is_union<int>::value, "");
  82
  83 static_assert(is_class_v<EmptyFinal> && is_class<EmptyFinal>::value, "");
  84 static_assert(!is_class_v<int> && !is_class<int>::value, "");
  85
  86 static_assert(is_function_v<void()> && is_function<void()>::value, "");
  87 static_assert(!is_function_v<void(*)()> && !is_function<void(*)()>::value, "");
  88
  89 static_assert(is_reference_v<int&> && is_reference<int&>::value, "");
  90 static_assert(!is_reference_v<int> && !is_reference<int>::value, "");
  91
  92 static_assert(is_arithmetic_v<int> && is_arithmetic<int>::value, "");
  93 static_assert(!is_arithmetic_v<void*> && !is_arithmetic<void*>::value, "");
  94
  95 static_assert(is_fundamental_v<int> && is_fundamental<int>::value, "");
  96 static_assert(!is_fundamental_v<EmptyFinal>
  97               && !is_fundamental<EmptyFinal>::value, "");
  98
  99 static_assert(is_object_v<int> && is_object<int>::value, "");
 100 static_assert(!is_object_v<int&> && !is_object<int&>::value, "");
 101
 102 static_assert(is_scalar_v<int> && is_scalar<int>::value, "");
 103 static_assert(!is_scalar_v<int&> && !is_scalar<int&>::value, "");
 104
 105 static_assert(is_compound_v<EmptyFinal>
 106               && is_compound<EmptyFinal>::value, "");
 107 static_assert(!is_compound_v<int> && !is_compound<int>::value, "");
 108
 109 static_assert(is_member_pointer_v<int (EmptyFinal::*)>
 110               && is_member_pointer<int (EmptyFinal::*)>::value, "");
 111 static_assert(!is_member_pointer_v<void*>
 112               && !is_member_pointer<void*>::value, "");
 113
 114 static_assert(is_const_v<const int> && is_const<const int>::value, "");
 115 static_assert(!is_const_v<int> && !is_const<int>::value, "");
 116
 117 static_assert(is_volatile_v<volatile int>
 118               && is_volatile<volatile int>::value, "");
 119 static_assert(!is_volatile_v<int> && !is_volatile<int>::value, "");
 120
 121 struct NType
 122 {
 123   NType(int);
 124   ~NType();
 125   int i;
 126 private:
 127   NType(const NType&);
 128   NType& operator=(const NType&);
 129   int i2;
 130 };
 131
 132 static_assert(is_trivial_v<int> && is_trivial<int>::value, "");
 133 static_assert(!is_trivial_v<NType> && !is_trivial<NType>::value, "");
 134
 135 static_assert(is_trivially_copyable_v<int>
 136               && is_trivially_copyable<int>::value, "");
 137 static_assert(!is_trivially_copyable_v<NType>
 138               && !is_trivially_copyable<NType>::value, "");
 139
 140 static_assert(is_standard_layout_v<int>
 141               && is_standard_layout<int>::value, "");
 142 static_assert(!is_standard_layout_v<NType>
 143               && !is_standard_layout<NType>::value, "");
 144
 145 static_assert(is_pod_v<int>
 146               && is_pod<int>::value, "");
 147 static_assert(!is_pod_v<NType>
 148               && !is_pod<NType>::value, "");
 149
 150 static_assert(is_literal_type_v<int>
 151               && is_literal_type<int>::value, "");
 152 static_assert(!is_literal_type_v<NType>
 153               && !is_literal_type<NType>::value, "");
 154
 155 static_assert(is_empty_v<EmptyFinal>
 156               && is_empty<EmptyFinal>::value, "");
 157 static_assert(!is_empty_v<NType>
 158               && !is_empty<NType>::value, "");
 159
 160 struct Abstract {protected: virtual ~Abstract() = 0;};
 161 struct Poly : Abstract {virtual ~Poly();};
 162
 163 static_assert(is_polymorphic_v<Poly>
 164               && is_polymorphic<Poly>::value, "");
 165 static_assert(!is_polymorphic_v<EmptyFinal>
 166               && !is_polymorphic<EmptyFinal>::value, "");
 167
 168
 169
 170 static_assert(is_abstract_v<Abstract>
 171               && is_abstract<Abstract>::value, "");
 172 static_assert(!is_abstract_v<EmptyFinal>
 173               && !is_abstract<EmptyFinal>::value, "");
 174
 175 static_assert(is_final_v<EmptyFinal>
 176               && is_final<EmptyFinal>::value, "");
 177 static_assert(!is_final_v<Abstract>
 178               && !is_final<Abstract>::value, "");
 179
 180 static_assert(is_signed_v<int> && is_signed<int>::value, "");
 181 static_assert(!is_signed_v<unsigned int>
 182               && !is_signed<unsigned int>::value, "");
 183
 184 static_assert(is_constructible_v<int, int>
 185               && is_constructible<int, int>::value, "");
 186 static_assert(!is_constructible_v<int, void*>
 187               && !is_constructible<int, void*>::value, "");
 188
 189 static_assert(is_default_constructible_v<int>
 190               && is_default_constructible<int>::value, "");
 191 static_assert(!is_default_constructible_v<NType>
 192               && !is_default_constructible<NType>::value, "");
 193
 194 static_assert(is_copy_constructible_v<int>
 195               && is_copy_constructible<int>::value, "");
 196 static_assert(!is_copy_constructible_v<NType>
 197               && !is_copy_constructible<NType>::value, "");
 198
 199 static_assert(is_move_constructible_v<int>
 200               && is_copy_constructible<int>::value, "");
 201 static_assert(!is_move_constructible_v<NType>
 202               && !is_copy_constructible<NType>::value, "");
 203
 204 static_assert(is_assignable_v<int&, int>
 205               && is_assignable<int&, int>::value, "");
 206 static_assert(!is_assignable_v<int, int>
 207               && !is_assignable<int, int>::value, "");
 208
 209 static_assert(is_copy_assignable_v<int>
 210               && is_copy_assignable<int>::value, "");
 211 static_assert(!is_copy_assignable_v<NType>
 212               && !is_copy_assignable<NType>::value, "");
 213
 214 static_assert(is_move_assignable_v<int>
 215               && is_move_assignable<int>::value, "");
 216 static_assert(!is_move_assignable_v<NType>
 217               && !is_move_assignable<NType>::value, "");
 218
 219 static_assert(is_destructible_v<int>
 220               && is_destructible<int>::value, "");
 221 static_assert(!is_destructible_v<Abstract>
 222               && !is_destructible<Abstract>::value, "");
 223
 224 static_assert(is_trivially_constructible_v<int, int>
 225               && is_trivially_constructible<int, int>::value, "");
 226 static_assert(!is_trivially_constructible_v<NType, NType>
 227               && !is_trivially_constructible<NType, NType>::value, "");
 228
 229 static_assert(is_trivially_default_constructible_v<int>
 230               && is_trivially_default_constructible<int>::value, "");
 231 static_assert(!is_trivially_default_constructible_v<NType>
 232               && !is_trivially_default_constructible<NType>::value, "");
 233
 234 static_assert(is_trivially_copy_constructible_v<int>
 235               && is_trivially_copy_constructible<int>::value, "");
 236 static_assert(!is_trivially_copy_constructible_v<NType>
 237               && !is_trivially_copy_constructible<NType>::value, "");
 238
 239 static_assert(is_trivially_move_constructible_v<int>
 240               && is_trivially_move_constructible<int>::value, "");
 241 static_assert(!is_trivially_move_constructible_v<NType>
 242               && !is_trivially_move_constructible<NType>::value, "");
 243
 244 static_assert(is_trivially_assignable_v<int&, int>
 245               && is_trivially_assignable<int&, int>::value, "");
 246 static_assert(!is_trivially_assignable_v<NType, NType>
 247               && !is_trivially_assignable<NType, NType>::value, "");
 248
 249 static_assert(is_trivially_copy_assignable_v<int>
 250               && is_trivially_copy_assignable<int>::value, "");
 251 static_assert(!is_trivially_copy_assignable_v<NType>
 252               && !is_trivially_copy_assignable<NType>::value, "");
 253
 254 static_assert(is_trivially_move_assignable_v<int>
 255               && is_trivially_move_assignable<int>::value, "");
 256 static_assert(!is_trivially_move_assignable_v<NType>
 257               && !is_trivially_move_assignable<NType>::value, "");
 258
 259 static_assert(is_trivially_destructible_v<int>
 260               && is_trivially_destructible<int>::value, "");
 261 static_assert(!is_trivially_destructible_v<Abstract>
 262               && !is_trivially_destructible<Abstract>::value, "");
 263
 264 static_assert(is_nothrow_constructible_v<int, int>
 265               && is_nothrow_constructible<int, int>::value, "");
 266 static_assert(!is_nothrow_constructible_v<NType, NType>
 267               && !is_nothrow_constructible<NType, NType>::value, "");
 268
 269 static_assert(is_nothrow_default_constructible_v<int>
 270               && is_nothrow_default_constructible<int>::value, "");
 271 static_assert(!is_nothrow_default_constructible_v<NType>
 272               && !is_nothrow_default_constructible<NType>::value, "");
 273
 274 static_assert(is_nothrow_copy_constructible_v<int>
 275               && is_nothrow_copy_constructible<int>::value, "");
 276 static_assert(!is_nothrow_copy_constructible_v<NType>
 277               && !is_nothrow_copy_constructible<NType>::value, "");
 278
 279 static_assert(is_nothrow_move_constructible_v<int>
 280               && is_nothrow_move_constructible<int>::value, "");
 281 static_assert(!is_nothrow_move_constructible_v<NType>
 282               && !is_nothrow_move_constructible<NType>::value, "");
 283
 284 static_assert(is_nothrow_assignable_v<int&, int>
 285               && is_nothrow_assignable<int&, int>::value, "");
 286 static_assert(!is_nothrow_assignable_v<NType, NType>
 287               && !is_nothrow_assignable<NType, NType>::value, "");
 288
 289 static_assert(is_nothrow_copy_assignable_v<int>
 290               && is_nothrow_copy_assignable<int>::value, "");
 291 static_assert(!is_nothrow_copy_assignable_v<NType>
 292               && !is_nothrow_copy_assignable<NType>::value, "");
 293
 294 static_assert(is_nothrow_move_assignable_v<int>
 295               && is_nothrow_move_assignable<int>::value, "");
 296 static_assert(!is_nothrow_move_assignable_v<NType>
 297               && !is_nothrow_move_assignable<NType>::value, "");
 298
 299 static_assert(has_virtual_destructor_v<Abstract>
 300               && has_virtual_destructor<Abstract>::value, "");
 301 static_assert(!has_virtual_destructor_v<NType>
 302               && !has_virtual_destructor<NType>::value, "");
 303
 304 static_assert(alignment_of_v<int> == alignof(int)
 305               && alignment_of<int>::value == alignof(int) , "");
 306
 307 static_assert(rank_v<int[1][1]> == rank<int[1][1]>::value, "");
 308
 309 static_assert(extent_v<int[1][2], 1> == 2
 310               && extent<int[1][2], 1>::value == 2, "");
 311
 312 static_assert(is_same_v<int, int> && is_same<int, int>::value, "");
 313 static_assert(!is_same_v<int, char> && !is_same<int, char>::value, "");
 314
 315 static_assert(is_base_of_v<Abstract, Poly>
 316               && is_base_of<Abstract, Poly>::value, "");
 317 static_assert(!is_base_of_v<Abstract, NType>
 318               && !is_base_of<Abstract, NType>::value, "");
 319
 320 static_assert(is_convertible_v<int&, const int&>
 321               && is_convertible<int&, const int&>::value, "");
 322 static_assert(!is_convertible_v<const int&, int&>
 323               && !is_convertible<const int&, int&>::value, "");
 324
 325 static_assert(negation_v<false_type>, "");
 326 static_assert(!negation_v<true_type>, "");
 327 static_assert(conjunction_v<>, "");
 328 static_assert(!disjunction_v<>, "");
 329 static_assert(conjunction_v<true_type>, "");
 330 static_assert(!conjunction_v<false_type>, "");
 331 static_assert(disjunction_v<true_type>, "");
 332 static_assert(!disjunction_v<false_type>, "");
 333 static_assert(conjunction_v<true_type, true_type>, "");
 334 static_assert(!conjunction_v<true_type, false_type>, "");
 335 static_assert(disjunction_v<false_type, true_type>, "");
 336 static_assert(!disjunction_v<false_type, false_type>, "");
 337 static_assert(conjunction_v<true_type, true_type,
 338               true_type>, "");
 339 static_assert(!conjunction_v<true_type, true_type,
 340               false_type>, "");
 341 static_assert(disjunction_v<false_type, false_type,
 342               true_type>, "");
 343 static_assert(!disjunction_v<false_type, false_type,
 344               false_type>, "");