douhe4608 2015-07-19 20:24
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两种不同的类型如何使用接口在golang中实现相同的方法?

Say I have two structs:

type First struct {
    str string
}
type Second struct {
    str string
}

And I want both of them to implement interface A:

type A interface {
    PrintStr() //print First.str or Second.str
}

It seems redundant to have an implementation for both First and Second structs like so:

func (f First) PrintStr() {
    fmt.Print(f.str)
}

func (s Second) PrintStr() {
    fmt.Print(s.str)
}

Is there a way I can have one implementation for all the structs implementing interface A? Something like this, but it doesn't seem to work:

func (a A) PrintStr() {
    fmt.Print(a.str)
}

Thank you!

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4条回答 默认 最新

  • dscuu86620 2015-07-19 20:59
    关注

    No you can't, but you could create a base type and then embed it into your 2 struct, therefore only needing an implementation for the base type:

    type WithString struct {
        str string
    }
    
    type First struct {
        WithString
    }
    
    type Second struct {
        WithString
    }
    
    type A interface {
        PrintStr() //print First.str or Second.str
    }
    
    func (w WithString) PrintStr() {
        fmt.Print(w.str)
    }
    

    Usage:

    a := First{
        WithString: WithString{
            str: "foo",
        },
    }
    

    Complete Example on Playground

    Embed documentation

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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