【GoLang】golang中可以直接返回slice吗?YES

结论:

可以,slice本质是结构体,返回slice时返回的是结构体的值,结构体的指针、len、cap等信息也全部返回了。

如下:

type slice struct {
  start       *uintptr
  length    int64
  capacity int64
}
example := make([]byte, 0, 10) // slice{start:calloc(10), length:0, capacity:10}

return example // return the VALUE slice{start:calloc(10), length:0, capacity:10}
 
example2 := make([]byte, len(example), cap(example))
copy(example2, example)
return example2 // return the VALUE slice{start:calloc(10), length:0, capacity:10} but its a new COPY
package main
/* How to return by value */

import "fmt"

func getArr() ([]int,[]int) {a:=[]int{1,2}; return a,a}

func main() {
arr1,arr2 := getArr()
arr1[1] = 3
fmt.Println(arr1,arr2)    
}

参考资料:

https://groups.google.com/forum/#!topic/golang-nuts/LA-cTnKY3cw

https://play.golang.org/p/bVP5wPCcQ2

原文地址:https://www.cnblogs.com/junneyang/p/6076810.html