Golang - Slices in nested structs

Question

I have a deeply nested struct which contains two slices, as seen below:

package main

import "fmt"

type bar struct {
    v1 []int
    v2 []int
}

type foo struct{ bar bar }
type tar struct{ foo foo }

func main() {
    f := &tar{foo: foo{bar: bar{v1: [2], v2: [3]}}}
    fmt.Printf("Hello, playground %s", f)
}

How do I initialize the two slices? Or how do I get this code working?

Here is the Golang Play for it: http://play.golang.org/p/zLutROI4YH.

Kavu · Accepted Answer · 2014-02-23 19:45:00Z

7

It's possible with []int{1,2,3} notation, example (solves your problem):

&tar{foo: foo{bar: bar{v1: []int{2}, v2: []int{2}}}}

P.S. I strongly advise you to read The Go Programming Language Specification and FAQ section.

answered Feb 23, 2014 at 19:45

Kavu

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tigrang · Accepted Answer · 2014-02-23 19:44:49Z

1

v1 and v2 are slices. The way you initialize those is with make([]int, YOUR_INITIAL_SIZE) instead of [2] and [3].

answered Feb 23, 2014 at 19:44

tigrang

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3 Comments

tigrang Over a year ago

That's what I assumed. I was about to edit it and say if you want to initialize with known values, look at @Kavu's answer.

Dustin Over a year ago

If you want to initialize empty, you're probably doing it wrong. Just leave them nil. The above case isn't empty, though, it's a bunch of zeros. The literal example in the other answer is probably what the user wanted.

tigrang Over a year ago

Good point, @Dustin. Because he had [2] and [3], I assumed that is what he wanted. Without more info about use case, can't really tell.

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