...

net/asio/adc_netservice_asio.h

@@ -757,6 +757,15 @@ public:
         return _shutdownType;
     }
 
+
+    template <typename OutputItT, typename FormatT = std::string_view>
+    static void formatError(std::error_code err,
+                            OutputItT out_iter,
+                            FormatT fmt = "{} (Err category: {}) (Err msg: {})")
+    {
+        std::format_to(out_iter, fmt, err.value(), err.category().name(), err.message());
+    }
+
 protected:
     static constexpr netservice_ident_t _ident =
         std::derived_from<socket_t, asio::basic_stream_socket<typename socket_t::protocol_type>>