...

net/adc_net_concepts.h

@@ -236,6 +236,9 @@ concept adc_logger_c = requires(LOGGERT log, const LOGGERT log_const) {
     // logging method signature:
     //     void method(std::string_view fmt, traits::formattable auto&& args...)
 
+    log.logMessage(std::declval<typename LOGGERT::loglevel_t>(), std::declval<std::string_view>());
+    log.logMessage(std::declval<typename LOGGERT::loglevel_t>(), std::declval<std::string_view>(),
+                   std::declval<std::string>());
 
     // logging method must accept at least the single argument - formatting string
     log.logInfo(std::declval<std::string_view>());