doujiu3097
2016-07-20 23:04 阅读 279
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如何在golang中实现void *? [重复]

This question already has an answer here:

I'm making a (non-binary) tree in Golang.

In Java, I'd use something like

 class Node{
   List <Object> data;
 }

Where data can be either a pointer to data or to a child node

In C or C++, I'd use a void*.

What type should I use in golang

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2条回答 默认 最新

  • 已采纳
    dtv995719 dtv995719 2016-07-21 00:17

    I've never tried to solve this problem in any language, would this work in Go?

    go play link edit after reading the duplicate question i see you're not asking about the implementation, enjoy anyway ♥︎

    package main
    
    import (
        "fmt"
    )
    
    type Node struct {
        List []*Node
        Data interface{}
    }
    
    func main() {
        trivial := Node{}
    
        leaf := Node{Data: 1}
    
        tree := Node{
            List: []*Node{
                &leaf,
                &leaf,
            },
        }
        out(trivial)
        out(leaf)
        out(tree)
    }
    
    func out(x interface{}) {
        fmt.Printf("%T:%+v
    ", x, x)
    }
    
    // main.Node:{List:[] Data:<nil>}
    // main.Node:{List:[] Data:1}
    // main.Node:{List:[0xc82000e180 0xc82000e180] Data:<nil>}
    
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  • doujiang1993 doujiang1993 2016-07-20 23:12

    There are no void pointers in Go. The way to handle this is by using the empty interface interface{} which is inherently implemented by all types. I asked a question about this awhile back which you can find here; Go equivalent of a void pointer in C

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