diff --git a/source/mijin/container/vector_map.hpp b/source/mijin/container/vector_map.hpp
index 53e5fb3..5fe5a08 100644
--- a/source/mijin/container/vector_map.hpp
+++ b/source/mijin/container/vector_map.hpp
@@ -133,7 +133,8 @@ public:
     VectorMap& operator=(VectorMap&&) = default;
     auto operator<=>(const VectorMap& other) const noexcept = default;
     
-    TValue& operator[](const TKey& key)
+    template<typename TIndex>
+    TValue& operator[](const TIndex& key)
     {
         auto it = find(key);
         if (it != end())
@@ -143,7 +144,8 @@ public:
         return emplace(key, TValue()).first->second;
     }
     
-    const TValue& operator[](const TKey& key) const
+    template<typename TIndex>
+    const TValue& operator[](const TIndex& key) const
     {
         return at(key);
     }
@@ -251,8 +253,9 @@ public:
         return eraseImpl(idx, count);
     }
 
+    template<typename TSearch>
     [[nodiscard]]
-    iterator find(const TKey& key) MIJIN_NOEXCEPT
+    iterator find(const TSearch& key) MIJIN_NOEXCEPT
     {
         for (std::size_t idx = 0; idx < keys_.size(); ++idx)
         {
@@ -264,8 +267,9 @@ public:
         return end();
     }
 
+    template<typename TSearch>
     [[nodiscard]]
-    const_iterator find(const TKey& key) const MIJIN_NOEXCEPT
+    const_iterator find(const TSearch& key) const MIJIN_NOEXCEPT
     {
         for (std::size_t idx = 0; idx < keys_.size(); ++idx)
         {