Function getSecond

sample/customDs.cpp:35–45

} // namespace std

constexpr auto getSecond(DummyStruct const &d)
{
  using namespace matchit;
  Id<char const *> i;
  return match(d)(
      // clang-format off
        pattern | ds(2, i) = expr(i),
        pattern | _        = expr("not matched")
      // clang-format on
  );
}

// #if __cplusplus > 201703L
static_assert(getSecond(DummyStruct{1, "123"}) ==