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  1. #include <vector>
  2. #include <algorithm>
  3. #include <functional>
  4. #include <iostream>
  5.  
  6. template<typename T>
  7. std::vector<T> keep(
  8.         const std::vector<T> &original,
  9.        std::function<bool(const T&)> useful)
  10. {
  11.     std::vector<T> out;
  12.     for(T item:original)
  13.     {
  14.         if(useful(item))
  15.             out.push_back(item);
  16.     }
  17.     return out;
  18. }
  19.  
  20. int main()
  21. {
  22.     std::vector<int> a={4,6,2,-5,3,-8,13,-11,27};
  23.     a=keep(a,std::function<bool(const int&)> ( [](const int& x)->bool{return x>0;}));
  24.  
  25.     for(int y:a)
  26.     {
  27.         std::cout<<y<<std::endl;
  28.     }
  29.     return 0;
  30. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin
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Standard input is empty
stdout
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4
6
2
3
13
27
https://ideone.com/r2gYTh
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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