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reflect.go
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reflect.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package util
import "reflect"
// EqualPtrFields uses reflection to check two "mirror" structures for matching pointer fields that
// point to the same object. Used to verify cloning/deep copy functions.
//
// Returns the names of equal pointer fields.
func EqualPtrFields(src, dst reflect.Value, prefix string) []string {
t := dst.Type()
if t.Kind() != reflect.Struct {
return nil
}
if srcType := src.Type(); srcType != t {
return nil
}
var res []string
for i := 0; i < t.NumField(); i++ {
srcF, dstF := src.Field(i), dst.Field(i)
switch f := t.Field(i); f.Type.Kind() {
case reflect.Ptr:
if srcF.Interface() == dstF.Interface() {
res = append(res, prefix+f.Name)
}
case reflect.Slice:
if srcF.Pointer() == dstF.Pointer() {
res = append(res, prefix+f.Name)
}
l := dstF.Len()
if srcLen := srcF.Len(); srcLen < l {
l = srcLen
}
for i := 0; i < l; i++ {
res = append(res, EqualPtrFields(srcF.Index(i), dstF.Index(i), f.Name+".")...)
}
case reflect.Struct:
res = append(res, EqualPtrFields(srcF, dstF, f.Name+".")...)
}
}
return res
}