diff --git a/develop/singles/headers/meta.hpp/meta_all.hpp b/develop/singles/headers/meta.hpp/meta_all.hpp
index 596dd77..eafd365 100644
--- a/develop/singles/headers/meta.hpp/meta_all.hpp
+++ b/develop/singles/headers/meta.hpp/meta_all.hpp
@@ -513,6 +513,66 @@ namespace meta_hpp::detail
     };
 }
 
+namespace meta_hpp::detail
+{
+    class hashed_string final {
+    public:
+        hashed_string() = default;
+        ~hashed_string() = default;
+
+        hashed_string(hashed_string&&) = default;
+        hashed_string(const hashed_string&) = default;
+
+        hashed_string& operator=(hashed_string&&) = default;
+        hashed_string& operator=(const hashed_string&) = default;
+
+        hashed_string(const char* str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        hashed_string(std::string_view str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        hashed_string(const std::string& str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        void swap(hashed_string& other) noexcept {
+            std::swap(hash_, other.hash_);
+        }
+
+        [[nodiscard]] std::size_t get_hash() const noexcept {
+            return hash_;
+        }
+    private:
+        std::size_t hash_{};
+    };
+
+    inline void swap(hashed_string& l, hashed_string& r) noexcept {
+        l.swap(r);
+    }
+
+    [[nodiscard]] inline bool operator<(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() < r.get_hash();
+    }
+
+    [[nodiscard]] inline bool operator==(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() == r.get_hash();
+    }
+
+    [[nodiscard]] inline bool operator!=(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() == r.get_hash();
+    }
+}
+
+namespace std
+{
+    template <>
+    struct hash<meta_hpp::detail::hashed_string> {
+        size_t operator()(meta_hpp::detail::hashed_string hs) const noexcept {
+            return hs.get_hash();
+        }
+    };
+}
+
 namespace meta_hpp::detail
 {
     template < typename Key, typename Compare, typename Allocator >
@@ -856,6 +916,7 @@ namespace meta_hpp::detail
 
 namespace meta_hpp
 {
+    using detail::hashed_string;
     using detail::memory_buffer;
 
     using detail::select_const;
diff --git a/headers/meta.hpp/meta_base.hpp b/headers/meta.hpp/meta_base.hpp
index 39b7da8..074df47 100644
--- a/headers/meta.hpp/meta_base.hpp
+++ b/headers/meta.hpp/meta_base.hpp
@@ -12,6 +12,7 @@
 #include "meta_base/cvref_traits.hpp"
 #include "meta_base/fixed_function.hpp"
 #include "meta_base/hash_combiner.hpp"
+#include "meta_base/hashed_string.hpp"
 #include "meta_base/insert_or_assign.hpp"
 #include "meta_base/is_in_place_type.hpp"
 #include "meta_base/memory_buffer.hpp"
@@ -25,6 +26,7 @@
 
 namespace meta_hpp
 {
+    using detail::hashed_string;
     using detail::memory_buffer;
 
     using detail::select_const;
diff --git a/headers/meta.hpp/meta_base/hashed_string.hpp b/headers/meta.hpp/meta_base/hashed_string.hpp
new file mode 100644
index 0000000..900a71a
--- /dev/null
+++ b/headers/meta.hpp/meta_base/hashed_string.hpp
@@ -0,0 +1,69 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021-2023, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include "base.hpp"
+
+namespace meta_hpp::detail
+{
+    class hashed_string final {
+    public:
+        hashed_string() = default;
+        ~hashed_string() = default;
+
+        hashed_string(hashed_string&&) = default;
+        hashed_string(const hashed_string&) = default;
+
+        hashed_string& operator=(hashed_string&&) = default;
+        hashed_string& operator=(const hashed_string&) = default;
+
+        hashed_string(const char* str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        hashed_string(std::string_view str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        hashed_string(const std::string& str) noexcept
+        : hash_{std::hash<std::string_view>{}(str)} {}
+
+        void swap(hashed_string& other) noexcept {
+            std::swap(hash_, other.hash_);
+        }
+
+        [[nodiscard]] std::size_t get_hash() const noexcept {
+            return hash_;
+        }
+    private:
+        std::size_t hash_{};
+    };
+
+    inline void swap(hashed_string& l, hashed_string& r) noexcept {
+        l.swap(r);
+    }
+
+    [[nodiscard]] inline bool operator<(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() < r.get_hash();
+    }
+
+    [[nodiscard]] inline bool operator==(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() == r.get_hash();
+    }
+
+    [[nodiscard]] inline bool operator!=(hashed_string l, hashed_string r) noexcept {
+        return l.get_hash() == r.get_hash();
+    }
+}
+
+namespace std
+{
+    template <>
+    struct hash<meta_hpp::detail::hashed_string> {
+        size_t operator()(meta_hpp::detail::hashed_string hs) const noexcept {
+            return hs.get_hash();
+        }
+    };
+}