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  1. package main
  2.  
  3. import "fmt"
  4. import "time"
  5.  
  6. func background_merger(f func(int) int, in1 <-chan int, in2 <-chan int, out chan<- int, n int) {
  7.     for i:=0; i<n; i++ {
  8.         num1 := <-in1
  9.         num2 := <-in2
  10.         out<- (f(num1) + f(num2))
  11.     }
  12. }
  13.  
  14. func Merge2Channels(f func(int) int, in1 <-chan int, in2 <-chan int, out chan<- int, n int) {
  15.     go background_merger(f, in1, in2, out, n)
  16. }
  17.  
  18. func foo(num int) int {
  19.     time.Sleep(time.Millisecond * 200)
  20.     return num;
  21. }
  22.  
  23. func feed_channels(in1 chan<- int, in2 chan<- int, n int) {
  24.     for i:=0; i<n; i++ {
  25.         in1 <- i*1000
  26.         in2 <- i*20
  27.     }
  28. }
  29.  
  30. func main() {
  31.     ch1 := make(chan int)
  32.     ch2 := make(chan int)
  33.     out := make(chan int)
  34.  
  35.     fmt.Println("start")
  36.     Merge2Channels(foo, ch1, ch2, out, 10)
  37.     go feed_channels(ch1, ch2, 10)
  38.     fmt.Println("end")
  39.  
  40.     for i:=0; i<10; i++ {
  41.         res := <-out
  42.         fmt.Println(res)
  43.     }
  44. }
  45.  
Success #stdin #stdout 0s 4396KB
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https://ideone.com/J5hhSO
language:
Go (go 1.12.1)
created:
5 years ago
visibility:
public

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