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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. int main()
  5. {
  6.     std::function<long(int)> lambda = [&](int x) -> long {
  7.         if (x != 0)
  8.             return x+lambda(x-1);
  9.         else
  10.             return 0;
  11.     };
  12.     std::cout << lambda(20) << std::endl;
  13.     return 0;
  14. }
Success #stdin #stdout 0s 3456KB
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https://ideone.com/bK2sZW
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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