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@ -28,6 +28,50 @@ func Indirect(v reflect.Value) reflect.Value {
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return v
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}
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// IndirectAddr walks down v allocating pointers as needed,
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// until it gets to a non-pointer.
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func IndirectAddr(v reflect.Value) reflect.Value {
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v0 := v
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haveAddr := false
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// 如果v是命名类型并且可寻址(非指针)
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if v.Kind() != reflect.Ptr && v.Type().Name() != "" && v.CanAddr() {
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haveAddr = true
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v = v.Addr()
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}
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for {
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// 从接口加载值,但前提是结果可有效寻址。
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if v.Kind() == reflect.Interface && !v.IsNil() {
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e := v.Elem()
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if e.Kind() == reflect.Ptr && !e.IsNil() && e.Elem().Kind() == reflect.Ptr {
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haveAddr = false
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v = e
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continue
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}
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}
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if v.Kind() != reflect.Ptr {
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break
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}
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// 防止无限循环,v有可能是是指向其自身地址的接口:
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// var v any
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// v = &v
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if v.Elem().Kind() == reflect.Interface && v.Elem().Elem() == v {
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v = v.Elem()
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break
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}
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if v.IsNil() && v.CanSet() {
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v.Set(reflect.New(v.Type().Elem()))
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}
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if haveAddr {
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v = v0 // 返回原始值,如果可寻址
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haveAddr = false
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} else {
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v = v.Elem()
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}
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}
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return v
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}
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// Len get reflect value length
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func Len(v reflect.Value) int {
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v = reflect.Indirect(v)
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