refactored newPattern()

compile.go

@@ -35,7 +35,9 @@ var (
 //	}
 func Compile(uncompiledPattern string) (*Pattern, error) {
 
-	pattern := newPattern(defaultFieldTagName)
+	var pattern Pattern
+
+	newPattern(&pattern, defaultFieldTagName)
 
 	s := uncompiledPattern
 	for {
@@ -92,7 +94,7 @@ func Compile(uncompiledPattern string) (*Pattern, error) {
 	}
 
 
-	return pattern, nil
+	return &pattern, nil
 }
 
 

pattern.go

@@ -37,20 +37,21 @@ type Pattern struct {
 	fieldTagName        string
 }
 
-func newPattern(fieldTagName string) *Pattern {
+func newPattern(target *Pattern, fieldTagName string) error {
+	if nil == target {
+		return errNilTarget
+	}
+
 	bits     := []string{}
 	names    := []string{}
 	namesSet := map[string]struct{}{}
 
-	pattern := Pattern{
+	target.bits         = bits
-		bits:bits,
+	target.names        = names
-		names:names,
+	target.namesSet     = namesSet
-		namesSet:namesSet,
+	target.fieldTagName = fieldTagName
-		fieldTagName:fieldTagName,
-	}
-
-	return &pattern
 
+	return nil
 }
 
 func (pattern *Pattern) MatchNames() []string {