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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <numeric>
  5. using namespace std;
  6.  
  7. struct myStruct
  8. {
  9. 	int num;
  10. };
  11.  
  12. int main()
  13. {
  14. 	vector<myStruct> numVec(20);
  15. 	int sum;
  16.  
  17. 	for(int i = 0; i < 20; ++i)
  18. 		numVec[i].num = i+1;
  19.  
  20. 	auto end = numVec.end();
  21. 	decltype(numVec)::difference_type increment = 5;
  22.  
  23.  
  24. 	for (auto start = numVec.begin(); start != end; ++start)
  25. 	{
  26.     	auto stop = start + std::min(end-start, increment);
  27.  
  28. 	    sum = std::accumulate(start, stop, 0,
  29.     	    [](auto a, const auto &elem){
  30.     	    	cout << "sum += " << elem.num << endl;
  31.     	    	return a + elem.num;
  32.     	    }
  33.     	);
  34.  
  35. 	    cout << "Sum: " << sum << endl;
  36. 	}
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0.01s 5628KB
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stdin
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Standard input is empty
stdout
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sum += 1
sum += 2
sum += 3
sum += 4
sum += 5
Sum: 15
sum += 2
sum += 3
sum += 4
sum += 5
sum += 6
Sum: 20
sum += 3
sum += 4
sum += 5
sum += 6
sum += 7
Sum: 25
sum += 4
sum += 5
sum += 6
sum += 7
sum += 8
Sum: 30
sum += 5
sum += 6
sum += 7
sum += 8
sum += 9
Sum: 35
sum += 6
sum += 7
sum += 8
sum += 9
sum += 10
Sum: 40
sum += 7
sum += 8
sum += 9
sum += 10
sum += 11
Sum: 45
sum += 8
sum += 9
sum += 10
sum += 11
sum += 12
Sum: 50
sum += 9
sum += 10
sum += 11
sum += 12
sum += 13
Sum: 55
sum += 10
sum += 11
sum += 12
sum += 13
sum += 14
Sum: 60
sum += 11
sum += 12
sum += 13
sum += 14
sum += 15
Sum: 65
sum += 12
sum += 13
sum += 14
sum += 15
sum += 16
Sum: 70
sum += 13
sum += 14
sum += 15
sum += 16
sum += 17
Sum: 75
sum += 14
sum += 15
sum += 16
sum += 17
sum += 18
Sum: 80
sum += 15
sum += 16
sum += 17
sum += 18
sum += 19
Sum: 85
sum += 16
sum += 17
sum += 18
sum += 19
sum += 20
Sum: 90
sum += 17
sum += 18
sum += 19
sum += 20
Sum: 74
sum += 18
sum += 19
sum += 20
Sum: 57
sum += 19
sum += 20
Sum: 39
sum += 20
Sum: 20
https://ideone.com/WSFeAg
language:
C++ 4.3.2 (gcc-4.3.2)
created:
3 years ago
visibility:
public

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