libstdc++-v3/testsuite/23_containers/vector/modifiers/swap/constexpr.cc

   1 // { dg-do compile { target c++20 } }
   2
   3 #include <vector>
   4 #include <utility>
   5 #include <testsuite_hooks.h>
   6
   7 constexpr bool
   8 test_std_swap()
   9 {
  10   std::vector<int> v1 = {1, 2, 3};
  11   std::vector<int> v2 = {0, 1};
  12
  13   std::swap(v1, v2);
  14
  15   VERIFY(v1.size() == 2);
  16   VERIFY(v1.at(0) == 0);
  17   VERIFY(v1.at(1) == 1);
  18
  19   VERIFY(v2.size() == 3);
  20   VERIFY(v2[0] == 1);
  21   VERIFY(v2[1] == 2);
  22   VERIFY(v2[2] == 3);
  23
  24   return true;
  25 }
  26
  27 static_assert(test_std_swap());
  28
  29 constexpr bool
  30 test_member_swap()
  31 {
  32   std::vector<int> v1 = {1, 2, 3};
  33   std::vector<int> v2 = {0, 1};
  34
  35   v1.swap(v2);
  36
  37   VERIFY(v1.size() == 2);
  38   VERIFY(v1.at(0) == 0);
  39   VERIFY(v1.at(1) == 1);
  40
  41   VERIFY(v2.size() == 3);
  42   VERIFY(v2[0] == 1);
  43   VERIFY(v2[1] == 2);
  44   VERIFY(v2[2] == 3);
  45
  46   return true;
  47 }
  48
  49 static_assert(test_member_swap());