Update Hash.h

Author: kimkulling

include/cppcore/Common/Hash.h

@@ -101,6 +101,7 @@ inline THash<T>::THash(T value, T base) :
 
 template <class T>
 inline T THash<T>::toHash(const char *buffer, T base) {
+    static_assert(std::is_integral<T>::value, "THash requires T to be an integral type.");
     T hash = 0;
     if (nullptr == buffer) {
         return hash;
@@ -114,7 +115,7 @@ inline T THash<T>::toHash(const char *buffer, T base) {
 
     return hash;
 }
-
+0
 template <class T>
 inline T THash<T>::toHash(T value, T base) {
     const T hash = value % base;