go两种遍历chan
go中对通道chan遍历有两种方式一种是用range另一种为for select。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | package main import ( "fmt" "strings" ) func main() { intChan0 := make( chan int, 10) for i := 0; i < 10; i++ { intChan0 <- i } close(intChan0) for i := range intChan0 { fmt.Printf( "range i value is %d, pointer is %d\n" , i, &i) } fmt.Println(strings.Repeat( "-" , 20)) intChan1 := make( chan int, 10) for i := 0; i < 10; i++ { intChan1 <- i } close(intChan1) forLoop: for { select { case i, ok := <-intChan1: if !ok { break forLoop } fmt.Printf( "for select i value is %d, pointer is %d\n" , i, &i) } } } |
上面打印结果为
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | range i value is 0, pointer is 824633794752 range i value is 1, pointer is 824633794752 range i value is 2, pointer is 824633794752 range i value is 3, pointer is 824633794752 range i value is 4, pointer is 824633794752 range i value is 5, pointer is 824633794752 range i value is 6, pointer is 824633794752 range i value is 7, pointer is 824633794752 range i value is 8, pointer is 824633794752 range i value is 9, pointer is 824633794752 -------------------- for select i value is 0, pointer is 824633794760 for select i value is 1, pointer is 824633794768 for select i value is 2, pointer is 824633794776 for select i value is 3, pointer is 824633794784 for select i value is 4, pointer is 824633794792 for select i value is 5, pointer is 824633794800 for select i value is 6, pointer is 824633794808 for select i value is 7, pointer is 824633794816 for select i value is 8, pointer is 824633794824 for select i value is 9, pointer is 824633794832 |
使用golang版本为1.21,可以看出,rang读取chan内元素,其指针一样,for select每次不同。
通常情况下,当有其他for select有其他case分支使用for select。
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