Type traits for any_of<T, Args...> and any_but<T, Args...>
#include <iostream>
#include "any_of.h"
template <typename T>
typename std::enable_if_t<any_of<T, size_t, int, float, double>::value, void>
print_number(T value) {
std::cout << value << "\n";
}
int main() {
std::cout << std::boolalpha;
std::cout << any_of<int, int, float>::value << "\n"; // true
std::cout << any_of<int, char, double>::value << "\n"; // false
std::cout << any_but<char, std::string, int, float>::value << "\n"; // true
print_number(5); // OK
// print_number('c'); // error: no matching function for call to 'print_number'
}