Yet another null check

rollbear · Dec 13, 2019 · 78b7e8b · 78b7e8b
1 parent 9993001
commit 78b7e8b
Showing 1 changed file with 21 additions and 2 deletions.
diff --git a/include/trompeloeil.hpp b/include/trompeloeil.hpp
@@ -1054,8 +1054,18 @@ template <typename T>
   };
 
   struct indirect_null {
-    template <typename T, typename R = decltype(nullptr == std::declval<T const&>())>
-    R operator==(T const&) const;
+    template <typename T, typename C, typename ... As>
+    using memfunptr = T (C::*)(As...);
+    template <typename T>
+    operator T*() const;
+    template <typename T>
+    operator T**() const;
+    template <typename T, typename C>
+    operator T C::*() const;
+    template <typename T, typename C, typename ... As>
+    operator memfunptr<T,C,As...> () const;
+
+    operator std::nullptr_t() const;
   };
 
   template <typename T, typename U>
@@ -1246,6 +1256,15 @@ template <typename T>
     }
   }
 
+  inline
+  void
+  print(
+      std::ostream& os,
+      std::nullptr_t)
+  {
+    os << "nullptr";
+  }
+
   inline
   constexpr
   auto