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

   1 // { dg-do compile { target c++20 } }
   2
   3 #include <vector>
   4 #include <testsuite_hooks.h>
   5
   6 constexpr bool
   7 test_data()
   8 {
   9   std::vector<int> v;
  10   VERIFY( v.data() == nullptr );
  11   v.reserve(1);
  12   VERIFY( v.data() != nullptr );
  13   const std::vector<int> v2{1,3,5,9};
  14   VERIFY( v.data() != v2.data() );
  15   VERIFY( v2.data()[2] == 5 );
  16
  17   v = v2;
  18   VERIFY( v.data() != v2.data() );
  19   VERIFY( v.data()[1] == 3 );
  20
  21   return true;
  22 }
  23
  24 static_assert(test_data());