class Foo {
    val log = KLoggers.logger(this)
    
    fun test() {
        log("This string will be evaluated regardless if trace enabled = ${log.isTraceEnabled}")
        log {"This string will not be evaluated unless trace enabled = ${log.isTraceEnabled}"}
    
        log("debug level")
        log { "debug level" }
        
        log.trace("trace")
        log.debug("debug")
        log.info("info")
        log.warn("warn")
        log.debug("error")
        
        log.trace { "trace" }
        log.debug { "debug" }
        log.info { "info" }
        log.warn { "warn" }
        log.debug { "error" }
    }
}

class Bar {
    private val log = KLoggers.logger(this)
    
    fun test() { log("Have some logging!") }
}

class Baz : WithLogging by KLoggerHolder() {
    fun test() { log("Have some logging!") }
}
 
class Qux {//*
    companion object: WithLogging by KLoggerHolder() 
    
    fun test() { log("Have some logging!") }
}