dousui4577 2014-12-07 09:36
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如何避免需要指针接收器的接口方法实现?

Consider the following example: http://play.golang.org/p/eAot_sVwND

package main

import "fmt"

type Incrementor interface {
    Increment()
}

type Counter struct {
    i int

    Incrementor
}

func (c *Counter) Increment(){
    c.i++
} 

func main() {
    var c Incrementor
    c = &Counter{}
    c.Increment()
    fmt.Println(c)  
}

Unfortunatelly I need to c = &Counter{} because Counter.Increment() implementation has a pointer receiver otherwise c.Increment() calls won't be able to modify c.x property:

func (c Counter) Increment(){
    c.i++ // no errors, but now we increment c.x having a copy of c as context
}

How to make original implementation works without & on c = &Counter{}? In other words, how to avoid the need for the pointer receiver on C.Increment implementation at all?

This is just a nit, but I think that maybe a pointer is not necessary to do that in Go.

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2条回答 默认 最新

  • doubiankang2845 2014-12-07 11:21
    关注

    You could consider defining an NewCounter function that encapsulates the initialization of your type (or some 3rd party) and returns a *Counter. Usage could look something like this:

    func main() {
        c := NewCounter()
        c.Increment()
        fmt.Println(c)  
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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