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  1. #include <cstdint>
  2. #include <functional>
  3. #include <iostream>
  4. #include <type_traits>
  5.  
  6. template<class F>
  7. struct function_traits;
  8.  
  9. // function pointer
  10. template<class... Args>
  11. struct function_traits<int (*)(Args...)>
  12.   : public function_traits<int (Args...)> {};
  13.  
  14. template<class... Args>
  15. struct function_traits<int (Args...)>
  16. {
  17.     static constexpr std::size_t arity = sizeof...(Args);
  18. };
  19.  
  20. template <typename Func,
  21.     typename std::enable_if_t<function_traits<Func>::arity == 3>* = nullptr>
  22. bool call_read(Func read)
  23. {
  24.     return true;
  25. }
  26.  
  27. template <typename Func,
  28.     typename std::enable_if_t<function_traits<Func>::arity == 1>* = nullptr>
  29. bool call_read(Func read)
  30. {
  31.     return true;
  32. }
  33.  
  34. int foo(int x, int y, int z)
  35. {
  36.     return 0;
  37. }
  38.  
  39. int main()
  40. {
  41.     call_read(foo);
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 15232KB
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https://ideone.com/vXll1H
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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