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  1. #include <algorithm>
  2. #include <iterator>
  3. #include <vector>
  4. #include <iostream>
  5.  
  6.  
  7. template <class InputIt, class OutputIt>
  8. OutputIt copy_n_max(InputIt begin, InputIt end, OutputIt last, size_t count)
  9. {
  10. 	return std::copy_if(begin, 
  11. 	                    end, 
  12. 	                    last, 
  13. 	                    [&count](typename std::iterator_traits<InputIt>::reference) -> bool 
  14. 	                    {
  15. 	                    	if (count > 0)
  16. 	                    	{
  17. 	                    		--count;
  18. 	                    		return true;
  19. 	                    	}
  20. 	                    	return false;
  21. 	                    });
  22. }
  23.  
  24. int main(int, char const *[])
  25. {
  26. 	{
  27. 		std::vector<long> input{ 1, 2, 3, 4, 5, 6};
  28. 		std::vector<long> output_short;
  29. 		std::vector<long> output_long;
  30.  
  31. 		copy_n_max(input.begin(), input.end(), std::back_inserter(output_short), 3);
  32. 		copy_n_max(input.begin(), input.end(), std::back_inserter(output_long), input.size());
  33.  
  34. 		std::cout << output_short.size() << std::endl;
  35. 		std::cout << output_long.size() << std::endl;
  36. 	}
  37.  
  38. 	{
  39. 		std::vector<bool> input{ true, true, true, true, false };
  40. 		std::vector<bool> output_short;
  41. 		std::vector<bool> output_long;
  42.  
  43. 		copy_n_max(input.begin(), input.end(), std::back_inserter(output_short), 3);
  44. 		copy_n_max(input.begin(), input.end(), std::back_inserter(output_long), input.size());
  45.  
  46. 		std::cout << output_short.size() << std::endl;
  47. 		std::cout << output_long.size() << std::endl;
  48. 	}
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/x8nwKV
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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