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  1. package main
  2.  
  3. import (
  4. 	"fmt"
  5. 	"time"
  6. )
  7.  
  8. type Callback func() int
  9.  
  10. func doSomething() {}
  11.  
  12. func callbackFactory(i int) Callback {
  13. 	return func() int {
  14. 		fmt.Println("callback", i)
  15. 		return i
  16. 	}
  17. }
  18.  
  19. var callbacks []Callback = []Callback{
  20. 	callbackFactory(1),
  21. 	callbackFactory(2),
  22. 	callbackFactory(3),
  23. 	callbackFactory(4)}
  24.  
  25. func combiner(iterator chan int) int {
  26. 	sum := 0
  27. 	for result := range iterator {
  28. 		sum += result
  29. 		if result == 2 {
  30. 			break
  31. 		}
  32. 	}
  33. 	return sum
  34. }
  35.  
  36. func main() {
  37. 	iterator := make(chan int)
  38. 	go func() {
  39. 		for _, callback := range callbacks {
  40. 			doSomething()
  41. 			iterator <- callback()
  42. 		}
  43. 		close(iterator)
  44. 		fmt.Println("terminate goroutine")
  45. 	}()
  46. 	fmt.Println("sum", combiner(iterator))
  47. 	time.Sleep(time.Second)
  48. }
  49.  
Success #stdin #stdout 0s 420736KB
comments (?)
stdin 
Standard input is empty
stdout 
callback 1
callback 2
callback 3
sum 3
https://ideone.com/YwgBm4
language:
Go (go 1.12.1)
created:
9 years ago
visibility:
public

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