douhuanbai6729 2017-02-09 10:27
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编码/解码后结构发生变化

The problem I'm currently having is after saving a struct to a json file and then opening the struct from the json file, somehow the properties of the struct have changed slightly.

In the struct N, sometimes A and B can point to the same J. However, after encoding then decoding they point to different Js of the value.

before encoding this returns true (expected). After decoding it, it returns false (not expected)

fmt.Println("is same pointer", n.A[0] == n.B[0])

Is this supposed to happen? Is there a way around this. Thanks.

type N struct {
        A       []*J
        B  []*J
        C []*J
    }

func (n *N) Save(name string) {
    name = "radacted.json"
    err := os.Remove(name)
    file, err := os.Create(name)
    defer file.Close()
    if err != nil {
        fmt.Println(err)
    }
    bytes, err := json.Marshal(n)
    file.Write(bytes)
}

func Open(name string) *N {
    bytes, err := ioutil.ReadFile("redacted.json")    
    if err != nil {
        log.Fatal("decode error:", err)
    }
    var n NeuralNetwork
    json.Unmarshal(bytes, &n)

    return &n
}
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2条回答 默认 最新

  • douqiang7976 2017-02-09 10:41
    关注

    It's expected and documented behaviour

    Pointer values encode as the value pointed to.

    You can assert values equality

    *n.A[0] == *n.B[0]  //should stay
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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