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  1. #include <iostream>
  2. #include <array>
  3. #include <cassert>
  4.  
  5. using namespace std;
  6.  
  7. template<typename Q, void (*foo_p)(Q)>
  8. void wrapped(int x){  foo_p(x); }
  9.  
  10. void foo1(int x){
  11. 	if(x < 0){
  12. 		cout << "foo(negative numnber)==woot!?\n"; 
  13. 	} else {
  14. 		for(size_t i=0; i < x; i++)
  15. 			cout << i << ". foo1(" << x << ")\n";
  16. 	}
  17. }
  18. void foo2(double x){
  19.  cout << "foo2(" << x << ")\n";
  20. }
  21.  
  22. int main(){
  23.    using foo_t = void (*)(int);
  24.    std::array<foo_t, 2> arr;
  25.  
  26.    arr[0] = wrapped<int, foo1>;
  27.    arr[1] = wrapped<double, foo2>;
  28.  
  29.    size_t choice_idx;
  30.    int choice_input;
  31.    cout << "choose an idx: 0, or 1>>";
  32.    cin >> choice_idx;   
  33.    cout << "\nand an input int>>";
  34.    cin >> choice_input;
  35.    assert(choice_idx < arr.size());
  36.  
  37.    cout << "\n\n";
  38.    arr[choice_idx](choice_input);
  39.    return 0;
  40. }
  41.  
Success #stdin #stdout 0s 3464KB
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choose an idx: 0, or 1>>
and an input int>>

foo(negative numnber)==woot!?
https://ideone.com/WUznbs
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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