diff --git a/include/cppcore/conversion/string.h b/include/cppcore/conversion/string.h
index fc6b380..5c051f3 100644
--- a/include/cppcore/conversion/string.h
+++ b/include/cppcore/conversion/string.h
@@ -218,6 +218,15 @@ namespace std
             std::forward<X>(x).to_string(std::declval<basic_ostream<T_char, T_traits>&>()),
             std::declval<basic_ostream<T_char, T_traits>&>());
 
+    /**
+     * @brief Operator overload to write value to stream that supports the to_string method, with stream parameter.
+     */
+    template<typename T_char, typename T_traits, typename X>
+    inline auto operator<<(basic_ostream<T_char, T_traits>& os, X&& x)
+        -> decltype(
+            std::forward<X>(x).to_string(),
+            std::declval<basic_ostream<T_char, T_traits>&>());
+
 }
 
 #include "string.inl"
diff --git a/include/cppcore/conversion/string.inl b/include/cppcore/conversion/string.inl
index 51e2faa..52858b3 100644
--- a/include/cppcore/conversion/string.inl
+++ b/include/cppcore/conversion/string.inl
@@ -428,4 +428,14 @@ namespace std
         return os;
     }
 
+    template<typename T_char, typename T_traits, typename X>
+    inline auto operator<<(basic_ostream<T_char, T_traits>& os, X&& x)
+        -> decltype(
+            std::forward<X>(x).to_string(),
+            std::declval<basic_ostream<T_char, T_traits>&>())
+    {
+        os << std::forward<X>(x).to_string();
+        return os;
+    }
+
 }