fork download 
  1. package main
  2.  
  3. import (
  4. 	"fmt"
  5. )
  6.  
  7. type Callback func() int
  8. type Wrapper func() int
  9.  
  10. func doSomething() {}
  11. func callbackFactory(i int) Callback {
  12. 	return func() int {
  13. 		fmt.Println("callback", i)
  14. 		return i
  15. 	}
  16. }
  17.  
  18. var callbacks []Callback = []Callback{
  19. 	callbackFactory(1),
  20. 	callbackFactory(2),
  21. 	callbackFactory(3),
  22. 	callbackFactory(4)}
  23.  
  24. func combiner(wrappers []Wrapper) int {
  25. 	sum := 0
  26. 	for _, wrapper := range wrappers {
  27. 		result := wrapper()
  28. 		sum += result
  29. 		if result == 2 {
  30. 			break
  31. 		}
  32. 	}
  33. 	return sum
  34. }
  35.  
  36. func wrapperFactory(callback Callback) Wrapper {
  37. 	return func() int {
  38. 		doSomething()
  39. 		return callback()
  40. 	}
  41. }
  42.  
  43. func main() {
  44. 	wrappers := make([]Wrapper, len(callbacks))
  45. 	for idx, callback := range callbacks {
  46. 		wrappers[idx] = wrapperFactory(callback)
  47. 	}
  48.  
  49. 	fmt.Println("sum", combiner(wrappers))
  50. }
  51.  
Success #stdin #stdout 0s 420544KB
comments (?)
stdin 
Standard input is empty
stdout 
callback 1
callback 2
sum 3
https://ideone.com/tQ7mbu
language:
Go (go 1.12.1)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!