如何使用fmt.Sscan将整数解析为数组？

Question

I'm trying to scan a list of integers from a string into an array (or alternatively, a slice)

package main

import "fmt"

func main() {
    var nums [5]int
    n, _ := fmt.Sscan("1 2 3 4 5", &nums)  // doesn't work
    fmt.Println(nums)
}

What do I need to pass as second argument to Sscan in order for this to work?

I know I could pass nums[0], nums[1] ... etc., but I'd prefer a single argument.

Answer 1

I don't think this is possible as a convenient one-liner. As Sscan takes ...interface{}, you would need to pass slice of interfaces as well, hence converting your array first:

func main() {
    var nums [5]int

    // Convert to interfaces
    xnums := make([]interface{}, len(nums))
    for n := range nums {
        xnums[n] = &nums[n]
    }

    n, err := fmt.Sscan("1 2 3 4 5", xnums...)
    if err != nil {
        fmt.Printf("field %d: %s
", n+1, err)
    }

    fmt.Println(nums)
}

http://play.golang.org/p/1X28J7JJwl

Obviously you could mix different types in your interface array, so it would make the scanning of more complex string easier. For simply space-limited integers, you might be better using strings.Split or bufio.Scanner along with strconv.Atoi.