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  1. #include <iostream>
  2.  
  3. auto create_counter()
  4. {
  5.     return [counter = 0] () mutable -> int { return ++counter; };
  6. }
  7.  
  8. int main()
  9. {
  10.    auto counter1 = create_counter();
  11.    auto counter2 = create_counter();
  12.  
  13.    std::cout << counter1() << std::endl;
  14.    std::cout << counter1() << std::endl;
  15.  
  16.    std::cout << counter2() << std::endl;
  17.    std::cout << counter2() << std::endl;
  18.  
  19.    std::cout << counter1() << std::endl;
  20. }
  21.  
Success #stdin #stdout 0s 3468KB
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https://ideone.com/Plmzlk
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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