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  1. #include <iostream>
  2. #include <functional>
  3. int add(int a, int b){return a+b;}
  4. int sub(int a, int b){return a-b;}
  5. int mul(int a, int b){return a*b;}
  6.  
  7. int main()
  8. {
  9.     // array of pointers to functions
  10.     int (*arr1[])(int, int) = {add, sub, mul};
  11.     // array of std::reference_wrappers
  12.     std::reference_wrapper<int(int, int)> arr2[] = {std::ref(add), std::ref(sub), std::ref(mul)};
  13.     // array of std::functions
  14.     std::function<int(int,int)> arr3[] = {add, sub, mul};
  15.  
  16.     // let's use them
  17.     std::cout << arr1[0](1, 2) << ' ' << arr1[1](1,2) << ' ' << arr1[2](1,2) << '\n'
  18.               << arr2[0](1, 2) << ' ' << arr2[1](1,2) << ' ' << arr2[2](1,2) << '\n'
  19.               << arr3[0](1, 2) << ' ' << arr3[1](1,2) << ' ' << arr3[2](1,2) << '\n';
  20. }
  21.  
Success #stdin #stdout 0s 2884KB
comments (?)
stdin
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Standard input is empty
stdout
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3 -1 2
3 -1 2
3 -1 2
https://ideone.com/sVoHc
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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