duanmianxue2687
2016-06-10 14:50
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Golang：如何更改接口切片中的结构字段值

Problem in Playground: https://play.golang.org/p/UKB8f4qGsM

I have a slice of interfaces, I know for sure which type they have (in reality i don't so I'd have to type switch it, but I left that out for clarity). How can I assign a value to a field in the struct behind the interface? The type assertion seems to take away the reference.

I also tried using pointers, that too doesn't work though, mostly because I can't type assert then (type *inter cannot be type asserted) and when I dereference it, it kinda makes it pointless to even have...

I'm not that experienced in Go, I would appreciate every help I can get.

图片转代码服务由CSDN问答提供 功能建议

游乐场中的问题： https://play.golang.org/p/UKB8f4qGsM

我有一部分接口，我确定它们具有哪种类型（在 现实我不是，所以我必须键入switch，但是为了清楚起见，我省略了它。 如何为接口后面的结构中的字段分配值？ 类型断言似乎夺走了引用。

我也尝试过使用指针，但这也行不通，主要是因为我当时不能键入断言（类型* inter不能为 类型断言），而当我取消引用它时，甚至还没有意义……

我对Go并不了解，我将不胜感激。 / p>

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1条回答 默认 最新

  • douao8204 2016-06-10 14:53
    已采纳

    You can't change the value stored in the interface, you need to use a pointer to the value you want to change:

    for i := 0; i < 5; i++ {
    slice = append(slice, &b{a: a{name: "Tom"}})
}

for i, _ := range slice {
    x := slice[i].(*b)
    x.name = "Tim"
}
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