libcxx/test/std/utilities/meta/meta.trans/meta.trans.other/decay.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // type_traits
  10
  11 // decay
  12
  13 #include <type_traits>
  14
  15 #include "test_macros.h"
  16
  17 template <class T, class U>
  18 void test_decay()
  19 {
  20     ASSERT_SAME_TYPE(U, typename std::decay<T>::type);
  21 #if TEST_STD_VER > 11
  22     ASSERT_SAME_TYPE(U,        std::decay_t<T>);
  23 #endif
  24 }
  25
  26 int main(int, char**)
  27 {
  28     test_decay<void, void>();
  29     test_decay<int, int>();
  30     test_decay<const volatile int, int>();
  31     test_decay<int*, int*>();
  32     test_decay<int&, int>();
  33     test_decay<const volatile int&, int>();
  34     test_decay<int[3], int*>();
  35     test_decay<const int[3], const int*>();
  36     test_decay<void(), void (*)()>();
  37 #if TEST_STD_VER > 11
  38     test_decay<int&&, int>();
  39     test_decay<const volatile int&&, int>();
  40     test_decay<int(int) const, int(int) const>();
  41     test_decay<int(int) volatile, int(int) volatile>();
  42     test_decay<int(int)  &, int(int)  &>();
  43     test_decay<int(int) &&, int(int) &&>();
  44 #endif
  45
  46   return 0;
  47 }