Fixed issue #527

include/spdlog/logger.h

@@ -118,6 +118,9 @@ protected:
     // return true if the given message level should trigger a flush
     bool _should_flush_on(const details::log_msg&);
 
+    // increment the message count (only if defined(SPDLOG_ENABLE_MESSAGE_COUNTER))
+    void _incr_msg_counter(details::log_msg &msg);
+
     const std::string _name;
     std::vector<sink_ptr> _sinks;
     formatter_ptr _formatter;