cpp-example.cpp

#include <iostream>
#include <vector>
#include <algorithm>

int main() {

  std::vector<int> v{1,2,3,4};
  
  std::vector<int> b;
  std::transform(v.begin(), v.end(), std::back_inserter(b), [](int a){return 2 * a;});
  
  for (const auto& e : b) {
    std::cout << e << "\n";
  }
  
  return 0;
}