upcastable class template added to provide the base class for upcastable classes

2019-03-06 18:12:59 -10:00
parent 776c91cf64
commit 310541c9f1
4 changed files with 13 additions and 12 deletions
@@ -110,6 +110,13 @@ namespace units {
  template<Ratio Ratio1, Ratio Ratio2>
  using common_ratio_t = typename common_ratio<Ratio1, Ratio2>::type;

+  // upcastable
+
+  template<typename BaseType>
+  struct upcastable {
+    using base_type = BaseType;
+  };
+
  // upcasting_traits

  template<typename T>