Function main

Examples/NoModules/Chapter 21/Ex21_03/Ex21_03.cpp:8–15

static_assert(requires { typename Array<std::unique_ptr<int>>; });

int main()
{
  Array<std::unique_ptr<int>> tenSmartPointers(10);
  Array<std::unique_ptr<int>> target;
  // target = tenSmartPointers;   /* Constraint not satisfied: copyable<unique_ptr> */
  target = std::move(tenSmartPointers);
  target.push_back(std::make_unique<int>(123));
}