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

   1 // { dg-additional-options "-Wno-deprecated" { target c++2a } }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2014-2024 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 // Deprecated in C++20
 146 static_assert(is_pod_v<int>
 147               && is_pod<int>::value, "");
 148 static_assert(!is_pod_v<NType>
 149               && !is_pod<NType>::value, "");
 150
 151 #pragma GCC diagnostic push
 152 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 153 static_assert(is_literal_type_v<int>
 154               && is_literal_type<int>::value, "");
 155 static_assert(!is_literal_type_v<NType>
 156               && !is_literal_type<NType>::value, "");
 157 #pragma GCC diagnostic pop
 158
 159 static_assert(is_empty_v<EmptyFinal>
 160               && is_empty<EmptyFinal>::value, "");
 161 static_assert(!is_empty_v<NType>
 162               && !is_empty<NType>::value, "");
 163
 164 struct Abstract {protected: virtual ~Abstract() = 0;};
 165 struct Poly : Abstract {virtual ~Poly();};
 166
 167 static_assert(is_polymorphic_v<Poly>
 168               && is_polymorphic<Poly>::value, "");
 169 static_assert(!is_polymorphic_v<EmptyFinal>
 170               && !is_polymorphic<EmptyFinal>::value, "");
 171
 172
 173
 174 static_assert(is_abstract_v<Abstract>
 175               && is_abstract<Abstract>::value, "");
 176 static_assert(!is_abstract_v<EmptyFinal>
 177               && !is_abstract<EmptyFinal>::value, "");
 178
 179 static_assert(is_final_v<EmptyFinal>
 180               && is_final<EmptyFinal>::value, "");
 181 static_assert(!is_final_v<Abstract>
 182               && !is_final<Abstract>::value, "");
 183
 184 static_assert(is_signed_v<int> && is_signed<int>::value, "");
 185 static_assert(!is_signed_v<unsigned int>
 186               && !is_signed<unsigned int>::value, "");
 187
 188 static_assert(is_constructible_v<int, int>
 189               && is_constructible<int, int>::value, "");
 190 static_assert(!is_constructible_v<int, void*>
 191               && !is_constructible<int, void*>::value, "");
 192
 193 static_assert(is_default_constructible_v<int>
 194               && is_default_constructible<int>::value, "");
 195 static_assert(!is_default_constructible_v<NType>
 196               && !is_default_constructible<NType>::value, "");
 197
 198 static_assert(is_copy_constructible_v<int>
 199               && is_copy_constructible<int>::value, "");
 200 static_assert(!is_copy_constructible_v<NType>
 201               && !is_copy_constructible<NType>::value, "");
 202
 203 static_assert(is_move_constructible_v<int>
 204               && is_copy_constructible<int>::value, "");
 205 static_assert(!is_move_constructible_v<NType>
 206               && !is_copy_constructible<NType>::value, "");
 207
 208 static_assert(is_assignable_v<int&, int>
 209               && is_assignable<int&, int>::value, "");
 210 static_assert(!is_assignable_v<int, int>
 211               && !is_assignable<int, int>::value, "");
 212
 213 static_assert(is_copy_assignable_v<int>
 214               && is_copy_assignable<int>::value, "");
 215 static_assert(!is_copy_assignable_v<NType>
 216               && !is_copy_assignable<NType>::value, "");
 217
 218 static_assert(is_move_assignable_v<int>
 219               && is_move_assignable<int>::value, "");
 220 static_assert(!is_move_assignable_v<NType>
 221               && !is_move_assignable<NType>::value, "");
 222
 223 static_assert(is_destructible_v<int>
 224               && is_destructible<int>::value, "");
 225 static_assert(!is_destructible_v<Abstract>
 226               && !is_destructible<Abstract>::value, "");
 227
 228 static_assert(is_trivially_constructible_v<int, int>
 229               && is_trivially_constructible<int, int>::value, "");
 230 static_assert(!is_trivially_constructible_v<NType, NType>
 231               && !is_trivially_constructible<NType, NType>::value, "");
 232
 233 static_assert(is_trivially_default_constructible_v<int>
 234               && is_trivially_default_constructible<int>::value, "");
 235 static_assert(!is_trivially_default_constructible_v<NType>
 236               && !is_trivially_default_constructible<NType>::value, "");
 237
 238 static_assert(is_trivially_copy_constructible_v<int>
 239               && is_trivially_copy_constructible<int>::value, "");
 240 static_assert(!is_trivially_copy_constructible_v<NType>
 241               && !is_trivially_copy_constructible<NType>::value, "");
 242
 243 static_assert(is_trivially_move_constructible_v<int>
 244               && is_trivially_move_constructible<int>::value, "");
 245 static_assert(!is_trivially_move_constructible_v<NType>
 246               && !is_trivially_move_constructible<NType>::value, "");
 247
 248 static_assert(is_trivially_assignable_v<int&, int>
 249               && is_trivially_assignable<int&, int>::value, "");
 250 static_assert(!is_trivially_assignable_v<NType, NType>
 251               && !is_trivially_assignable<NType, NType>::value, "");
 252
 253 static_assert(is_trivially_copy_assignable_v<int>
 254               && is_trivially_copy_assignable<int>::value, "");
 255 static_assert(!is_trivially_copy_assignable_v<NType>
 256               && !is_trivially_copy_assignable<NType>::value, "");
 257
 258 static_assert(is_trivially_move_assignable_v<int>
 259               && is_trivially_move_assignable<int>::value, "");
 260 static_assert(!is_trivially_move_assignable_v<NType>
 261               && !is_trivially_move_assignable<NType>::value, "");
 262
 263 static_assert(is_trivially_destructible_v<int>
 264               && is_trivially_destructible<int>::value, "");
 265 static_assert(!is_trivially_destructible_v<Abstract>
 266               && !is_trivially_destructible<Abstract>::value, "");
 267
 268 static_assert(is_nothrow_constructible_v<int, int>
 269               && is_nothrow_constructible<int, int>::value, "");
 270 static_assert(!is_nothrow_constructible_v<NType, NType>
 271               && !is_nothrow_constructible<NType, NType>::value, "");
 272
 273 static_assert(is_nothrow_default_constructible_v<int>
 274               && is_nothrow_default_constructible<int>::value, "");
 275 static_assert(!is_nothrow_default_constructible_v<NType>
 276               && !is_nothrow_default_constructible<NType>::value, "");
 277
 278 static_assert(is_nothrow_copy_constructible_v<int>
 279               && is_nothrow_copy_constructible<int>::value, "");
 280 static_assert(!is_nothrow_copy_constructible_v<NType>
 281               && !is_nothrow_copy_constructible<NType>::value, "");
 282
 283 static_assert(is_nothrow_move_constructible_v<int>
 284               && is_nothrow_move_constructible<int>::value, "");
 285 static_assert(!is_nothrow_move_constructible_v<NType>
 286               && !is_nothrow_move_constructible<NType>::value, "");
 287
 288 static_assert(is_nothrow_assignable_v<int&, int>
 289               && is_nothrow_assignable<int&, int>::value, "");
 290 static_assert(!is_nothrow_assignable_v<NType, NType>
 291               && !is_nothrow_assignable<NType, NType>::value, "");
 292
 293 static_assert(is_nothrow_copy_assignable_v<int>
 294               && is_nothrow_copy_assignable<int>::value, "");
 295 static_assert(!is_nothrow_copy_assignable_v<NType>
 296               && !is_nothrow_copy_assignable<NType>::value, "");
 297
 298 static_assert(is_nothrow_move_assignable_v<int>
 299               && is_nothrow_move_assignable<int>::value, "");
 300 static_assert(!is_nothrow_move_assignable_v<NType>
 301               && !is_nothrow_move_assignable<NType>::value, "");
 302
 303 static_assert(has_virtual_destructor_v<Abstract>
 304               && has_virtual_destructor<Abstract>::value, "");
 305 static_assert(!has_virtual_destructor_v<NType>
 306               && !has_virtual_destructor<NType>::value, "");
 307
 308 static_assert(alignment_of_v<int> == alignof(int)
 309               && alignment_of<int>::value == alignof(int) , "");
 310
 311 static_assert(rank_v<int[1][1]> == rank<int[1][1]>::value, "");
 312
 313 static_assert(extent_v<int[1][2], 1> == 2
 314               && extent<int[1][2], 1>::value == 2, "");
 315
 316 static_assert(is_same_v<int, int> && is_same<int, int>::value, "");
 317 static_assert(!is_same_v<int, char> && !is_same<int, char>::value, "");
 318
 319 static_assert(is_base_of_v<Abstract, Poly>
 320               && is_base_of<Abstract, Poly>::value, "");
 321 static_assert(!is_base_of_v<Abstract, NType>
 322               && !is_base_of<Abstract, NType>::value, "");
 323
 324 static_assert(is_convertible_v<int&, const int&>
 325               && is_convertible<int&, const int&>::value, "");
 326 static_assert(!is_convertible_v<const int&, int&>
 327               && !is_convertible<const int&, int&>::value, "");
 328
 329 static_assert(negation_v<false_type>, "");
 330 static_assert(!negation_v<true_type>, "");
 331 static_assert(conjunction_v<>, "");
 332 static_assert(!disjunction_v<>, "");
 333 static_assert(conjunction_v<true_type>, "");
 334 static_assert(!conjunction_v<false_type>, "");
 335 static_assert(disjunction_v<true_type>, "");
 336 static_assert(!disjunction_v<false_type>, "");
 337 static_assert(conjunction_v<true_type, true_type>, "");
 338 static_assert(!conjunction_v<true_type, false_type>, "");
 339 static_assert(disjunction_v<false_type, true_type>, "");
 340 static_assert(!disjunction_v<false_type, false_type>, "");
 341 static_assert(conjunction_v<true_type, true_type,
 342               true_type>, "");
 343 static_assert(!conjunction_v<true_type, true_type,
 344               false_type>, "");
 345 static_assert(disjunction_v<false_type, false_type,
 346               true_type>, "");
 347 static_assert(!disjunction_v<false_type, false_type,
 348               false_type>, "");
 349 #if __cpp_lib_reference_from_temporary >= 202202L
 350 static_assert(std::reference_converts_from_temporary_v<int&&, int>
 351               && std::reference_converts_from_temporary_v<const int&, int>
 352               && !std::reference_converts_from_temporary_v<int&&, int&&>
 353               && !std::reference_converts_from_temporary_v<const int&, int&&>
 354               && std::reference_converts_from_temporary_v<int&&, long&&>
 355               && std::reference_converts_from_temporary_v<int&&, long>, "");
 356 static_assert(std::reference_constructs_from_temporary_v<int&&, int>
 357               && std::reference_constructs_from_temporary_v<const int&, int>
 358               && !std::reference_constructs_from_temporary_v<int&&, int&&>
 359               && !std::reference_constructs_from_temporary_v<const int&, int&&>
 360               && std::reference_constructs_from_temporary_v<int&&, long&&>
 361               && std::reference_constructs_from_temporary_v<int&&, long>, "");
 362 #endif