modify something

include/featherlog/log_formatter.hpp

@@ -1,5 +1,4 @@
-#ifndef FEATHERLOG_LOG_FORMATTER_HPP
-#define FEATHERLOG_LOG_FORMATTER_HPP
+#pragma once
 
 #include <string>
 #include <featherlog/flog_definitions.h>
@@ -11,8 +10,6 @@ namespace flog
     public:
         virtual ~LogFormatter() = default;
 
-        virtual std::string FLOG_CALL format() = 0;
+        _NODISCARD virtual std::string FLOG_CALL format(const LogMessage& message) = 0;
     };
 }
-
-#endif