feat: 添加获取reflect.Value实际指向的反射对象的方法,并自动新建对象。

main
NoahLan 9 months ago
parent 4447dbfe14
commit a66fe300cd

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

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