Function dsByMember

sample/customDs.cpp:54–66

Another option to destructure your struct / class.

// Another option to destructure your struct / class.
constexpr auto dsByMember(DummyStruct const &v)
{
  using namespace matchit;
  // compose patterns for destructuring struct DummyStruct.
  constexpr auto dsA = dsVia(&DummyStruct::size, &DummyStruct::name);
  Id<char const *> i;
  return match(v)(
      // clang-format off
        pattern | dsA(2, i) = expr(i),
        pattern | _         = expr("not matched")
      // clang-format on
  );
}

static_assert(dsByMember(DummyStruct{1, "123"}) ==
              std::string_view{"not matched"});