introduced hasher for Void

therault · Sep 15, 2022 · ebfe297 · ebfe297
1 parent 7164fd0
commit ebfe297
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/ttg/ttg/util/hash.h b/ttg/ttg/util/hash.h
@@ -90,9 +90,16 @@ namespace ttg {
     template <>
     struct hash<void, void> {
       auto operator()() const { return detail::FNVhasher::initial_value(); }
+      // convenient to be able to hash Void using hash<void>
       auto operator()(const ttg::Void&) const { return operator()(); }
     };
 
+    /// instantiation of hash for Void
+    template <>
+    struct hash<Void, void> {
+      auto operator()(const ttg::Void&) const { return hash<void>{}(); }
+    };
+
     /// instantiation of hash for integral types smaller or equal to size_t
     template <typename T>
     struct hash<T, std::enable_if_t<std::is_integral_v<std::decay_t<T>> && sizeof(T) <= sizeof(std::size_t), void>> {