Get function parameters count [duplicate]

Answer 1

Yes, it can be easily done:

#include 
#include 

template 
struct function_ripper {
    static constexpr size_t n_args = sizeof...(ARGS);
};


template 
auto constexpr make_ripper(R (ARGS...) ) {
  return function_ripper();
}

void foo(int, double, const char*);

void check_args() {
  constexpr size_t foo_args = decltype(make_ripper(foo))::n_args;

  std::cout << "Foo has  " << foo_args << " arguments.\n";
}