Added missing hash specialization for std::pair

include/aidge/utils/DynamicAttributes.hpp

@@ -445,6 +445,17 @@ namespace std {
             return seed;
         }
     };
+
+    // Specialization of std::hash for std::pair<T1, T2>
+    template <typename T1, typename T2>
+    struct hash<std::pair<T1, T2>> {
+        std::size_t operator()(const std::pair<T1, T2>& p) const {
+            std::size_t seed = 0;
+            Aidge::hash_combine(seed, std::hash<T1>()(p.first));
+            Aidge::hash_combine(seed, std::hash<T2>()(p.second));
+            return seed;
+        }
+    };
 }
 
 namespace future_std {