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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. int foo( int n, std::function< void(int) > notify )
  5. {
  6.     int sum = 0 ;
  7. 	for( int i = 1 ; i < n ; ++i )
  8. 	{
  9. 		sum += i*i ;
  10. 		notify(sum) ;
  11. 	}
  12. 	return sum ;
  13. }
  14.  
  15. int main()
  16. {
  17.     const auto report_progress = [] ( int s )
  18.             { std::cout << "intermediate value returned: " << s << '\n' ; };
  19.     foo( 10, report_progress ) ;
  20. }
  21.  
Success #stdin #stdout 0s 3028KB
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stdin
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Standard input is empty
stdout
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intermediate value returned: 1
intermediate value returned: 5
intermediate value returned: 14
intermediate value returned: 30
intermediate value returned: 55
intermediate value returned: 91
intermediate value returned: 140
intermediate value returned: 204
intermediate value returned: 285
https://ideone.com/DAaQpP
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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