add some doc

levellogger.go

@@ -7,8 +7,10 @@ import (
 	"runtime/debug"
 )
 
-func NewLevelLogger(out io.Writer, level LogLevel) LevelLogger {
+// changed to return a pointer to a new LevelLogger
-	var ll LevelLogger
+func NewLevelLogger(out io.Writer, level LogLevel) *LevelLogger {
+
+	ll := &LevelLogger{}
 
 	ll.CurrentLevel = level
 
@@ -216,7 +218,7 @@ func (ll *LevelLogger) SetLoggingLevel(l int) {
 	}
 }
 
-func (ll LevelLogger) Blank(n int) {
+func (ll *LevelLogger) Blank(n int) {
 	outs := " "
 	if n < 1 {
 		n = 1
@@ -229,7 +231,7 @@ func (ll LevelLogger) Blank(n int) {
 	ll.blankLog.Print(outs)
 }
 
-func (ll LevelLogger) CheckFerr(e error, msg string) {
+func (ll *LevelLogger) CheckFerr(e error, msg string) {
 	if e != nil {
 		ll.Fatal(e, msg)
 	}