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  1. #include <iostream>
  2.  
  3. template <typename R, typename ... Types> constexpr size_t getArgumentCount( R(*f)(Types ...))
  4. {
  5.    return sizeof...(Types);
  6. }
  7.  
  8. void foo(int a, int b, int c)
  9. {
  10. }
  11.  
  12. int bar()
  13. {
  14.    return 0;
  15. }
  16.  
  17. int baz(double)
  18. {
  19.    return 0;
  20. }
  21.  
  22. int main()
  23. {
  24.     std::cout << getArgumentCount(foo) << std::endl;
  25.     std::cout << getArgumentCount(bar) << std::endl;
  26.     std::cout << getArgumentCount(baz) << std::endl;
  27.     return 0;
  28. }
Success #stdin #stdout 0s 3460KB
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https://ideone.com/oqF8E8
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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