vp is taking the address of v, so when the loop ends, v is the last element
in the slide and therefore *vp is {0,0}
Add a break to the condition when you assign vp, say
if v.X == 3 {
vp = &v
break
}
HTH,
Yamil
El martes, 10 de septiembre de 2019, 14:13:40 (UTC-5), Tong Sun escribió:
>
> I'm experiencing a weird problem with my program and finally nail it down
> to what exactly went wrong, so that I can write a minimum program to
> duplicate it. See the following program:
>
> package main
>
>
> import (
> "fmt"
> )
>
>
> type Vertex struct {
> X int
> Y int
> }
>
>
> func main() {
> vs := []Vertex{
> Vertex{1, 2}, // has type Vertex
> Vertex{X: 3}, // Y:0 is implicit
> Vertex{}, // X:0 and Y:0
> }
>
>
> fmt.Printf("Vertex Slice %+v\n", vs)
> var vp *Vertex = nil
> for _, v := range vs {
> if v.X == 3 {
> vp = &v
> }
> }
> fmt.Printf("Found: %+v\n", vp)
> }
>
>
> https://play.golang.org/p/R645C5plojx
>
> I was expecting that the found Vertex is "v.X == 3", however the result is
> not.
>
> - what exactly is causing the problem?
> - how to fix it so that I got what I was looking for?
>
> Again, the snip is at
> https://play.golang.org/p/R645C5plojx
>
> Thanks
>
>
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