update how config is passed in and assigned to validator

* makes it safer as options passed in by reference, in the future, will
  not be manipulatable externally.

examples_test.go

@@ -8,7 +8,7 @@ import (
 )
 
 func ExampleValidate_new() {
-	config := validator.Config{TagName: "validate"}
+	config := &validator.Config{TagName: "validate"}
 
 	validator.New(config)
 }
@@ -17,7 +17,7 @@ func ExampleValidate_field() {
 	// This should be stored somewhere globally
 	var validate *validator.Validate
 
-	config := validator.Config{TagName: "validate"}
+	config := &validator.Config{TagName: "validate"}
 
 	validate = validator.New(config)
 
@@ -43,7 +43,7 @@ func ExampleValidate_struct() {
 	// This should be stored somewhere globally
 	var validate *validator.Validate
 
-	config := validator.Config{TagName: "validate"}
+	config := &validator.Config{TagName: "validate"}
 
 	validate = validator.New(config)
 

validator.go

@@ -82,7 +82,7 @@ func (s *tagCacheMap) Set(key string, value *cachedTag) {
 
 // Validate contains the validator settings passed in using the Config struct
 type Validate struct {
-	config             Config
+	tagName            string
 	validationFuncs    map[string]Func
 	customTypeFuncs    map[reflect.Type]CustomTypeFunc
 	aliasValidators    map[string]string
@@ -144,12 +144,12 @@ type FieldError struct {
 }
 
 // New creates a new Validate instance for use.
-func New(config Config) *Validate {
+func New(config *Config) *Validate {
 
 	// if config.CustomTypeFuncs != nil && len(config.CustomTypeFuncs) > 0 {
 	// 	config.hasCustomFuncs = true
 	// }
-	v := &Validate{config: config, tagsCache: &tagCacheMap{m: map[string]*cachedTag{}}}
+	v := &Validate{tagName: config.TagName, tagsCache: &tagCacheMap{m: map[string]*cachedTag{}}}
 
 	if len(v.aliasValidators) == 0 {
 		// must copy validators for separate validations to be used in each validator instance
@@ -403,7 +403,7 @@ func (v *Validate) tranverseStruct(topStruct reflect.Value, currentStruct reflec
 			}
 		}
 
-		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, fld.Tag.Get(v.config.TagName), fld.Name, partial, exclude, includeExclude)
+		v.traverseField(topStruct, currentStruct, current.Field(i), errPrefix, errs, true, fld.Tag.Get(v.tagName), fld.Name, partial, exclude, includeExclude)
 	}
 }
 

validator_test.go

@@ -111,7 +111,7 @@ type TestSlice struct {
 	OmitEmpty []int `validate:"omitempty,min=1,max=10"`
 }
 
-var validate = New(Config{TagName: "validate"})
+var validate = New(&Config{TagName: "validate"})
 
 func AssertError(t *testing.T, err error, key, field, expectedTag string) {
 
@@ -1255,7 +1255,7 @@ func TestExistsValidation(t *testing.T) {
 
 func TestSQLValue2Validation(t *testing.T) {
 
-	config := Config{
+	config := &Config{
 		TagName: "validate",
 	}
 
@@ -1318,7 +1318,7 @@ func TestSQLValueValidation(t *testing.T) {
 	// customTypes[reflect.TypeOf(MadeUpCustomType{})] = ValidateCustomType
 	// customTypes[reflect.TypeOf(1)] = OverrideIntTypeForSomeReason
 
-	validate := New(Config{TagName: "validate"})
+	validate := New(&Config{TagName: "validate"})
 	validate.RegisterCustomTypeFunc(ValidateValuerType, (*driver.Valuer)(nil), valuer{})
 	validate.RegisterCustomTypeFunc(ValidateCustomType, MadeUpCustomType{})
 	validate.RegisterCustomTypeFunc(OverrideIntTypeForSomeReason, 1)
@@ -3875,7 +3875,7 @@ func TestAddFunctions(t *testing.T) {
 		return true
 	}
 
-	config := Config{
+	config := &Config{
 		TagName: "validateme",
 	}
 
@@ -3898,7 +3898,7 @@ func TestAddFunctions(t *testing.T) {
 
 func TestChangeTag(t *testing.T) {
 
-	config := Config{
+	config := &Config{
 		TagName: "val",
 	}
 	validate := New(config)