1:1
继承
FileLogAppender
-file:string
+log()+toYamlString()
-val:T
-operater()(F):T
LogAppender
-level:LogLevel-formatter:LogFormatter
FormatterItem
-format()
Config
-LookUp()
1；N
StdoutLogAppender
ConfigVarBase
-name:string-description:string
-fromstring()+tostring()
Logger
-name:string-level:Loglevel-appenders:std::vector<LogAppender>-formatter:Logformatter
+log()+debug()+info()+warn()+error()+fatal()+addAppender()+delAppender()+clearAppender()+setFormatter()+setLevel()
xxx Formatter
+format()
-var:T
-fromstring()+tostring()-getvalue()
LogFormatter
-formatter:string-items:std::vector<FormatterItem>
1:N
偏特化
