Introduce a base class for hashers

Chaos/Hashing/Hasher.hpp

@@ -0,0 +1,25 @@
+#ifndef CHAOS_HASHING_HASHER_HPP
+#define CHAOS_HASHING_HASHER_HPP
+
+namespace Chaos::Hashing
+{
+
+template<typename T>
+class Hasher
+{
+public:
+    template<typename InputIt>
+    void Update(InputIt begin, InputIt end)
+    {
+        static_cast<T &>(*this).Update(begin, end);
+    }
+
+    auto Finish()
+    {
+        return static_cast<T &>(*this).Finish();
+    }
+};
+
+} // namespace Chaos::Hashing
+
+#endif