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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5.     template<typename T>
  6.     struct is_pure_func_ptr: public std::false_type {};
  7.     template<typename Ret, typename... Args>
  8.     struct is_pure_func_ptr<Ret(Args...)>: public std::true_type {};//detecting functions themselves
  9.     template<typename Ret, typename... Args>
  10.     struct is_pure_func_ptr<Ret(*)(Args...)>: public std::true_type {};//detecting function pointers
  11. void f1()
  12. {};
  13.  
  14. int f2(int)
  15. {};
  16.  
  17. int f3(int, int)
  18. {};
  19.  
  20. struct Functor
  21. {
  22.     void operator ()()
  23.     {}
  24. };
  25.  
  26. int main()
  27. {
  28.     cout << is_pure_func_ptr<decltype(f1)>::value << endl; // output true
  29.     cout << is_pure_func_ptr<decltype(f2)>::value << endl; // output true
  30.     cout << is_pure_func_ptr<decltype(f3)>::value << endl; // output true
  31.     cout << is_pure_func_ptr<decltype(&f3)>::value << endl; // output true
  32.     cout << is_pure_func_ptr<Functor>::value << endl;      // output false
  33.     cout << is_pure_func_ptr<char*>::value << endl;        // output false
  34. }
Success #stdin #stdout 0s 2928KB
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https://ideone.com/53hjDt
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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