diff --git a/src/utils/contains.hpp b/src/utils/contains.hpp
index ea1dd16..0a26cc1 100644
--- a/src/utils/contains.hpp
+++ b/src/utils/contains.hpp
@@ -13,6 +13,12 @@
     container.find(container.begin()->first);
 };
 
+template <class T>
+concept HasMemberContains = requires(T container)
+{
+    container.contains(*container.begin());
+};
+
 } // namespace detail
 
 template <detail::HasMemberFind T>
@@ -22,6 +28,12 @@
     return container.find(key) != container.end();
 }
 
+template <detail::HasMemberContains T>
+inline bool contains(const T& container, const typename T::value_type& key)
+{
+    return container.contains(key);
+}
+
 template <class T>
 inline bool contains(const T& container, const typename T::value_type& key)
 {