Add is_cpp

typon/include/python/typon.hpp

@@ -6,6 +6,13 @@
 namespace py_typon {
 template <typename _Unused = void>
 struct typon__oo : referencemodel::moduletype<typon__oo<>> {
+
+struct : referencemodel::function {
+    auto operator()() const {
+      return typon::TyBool(true);
+    }
+  } static constexpr is_cpp{};
+
 };
 typon__oo<> all;
 } // namespace py_typon