std::linalg::add(C++26)

namespace std::linalg {
  template<in-object InObj1,
           in-object InObj2,
           out-object OutObj>
  void add(InObj1 x,
           InObj2 y,
           OutObj z);               // (1)

  template<class ExecutionPolicy,
           in-object InObj1,
           in-object InObj2,
           out-object OutObj>
  void add(ExecutionPolicy&& exec,
           InObj1 x,
           InObj2 y,
           OutObj z);               // (2)
}