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// add_volatile example
#include <iostream>
#include <type_traits>
int main() {
typedef std::add_volatile<int>::type A; // volatile int
typedef std::add_volatile<volatile int>::type B; // volatile int (unchanged)
typedef std::add_volatile<int* volatile>::type C; // int* volatile (unchanged)
typedef std::add_volatile<volatile int*>::type D; // volatile int* volatile
typedef std::add_volatile<volatile int&>::type E; // volatile int& (unchanged)
std::cout << std::boolalpha;
std::cout << "checking volatileness:" << std::endl;
std::cout << "A: " << std::is_volatile<A>::value << std::endl;
std::cout << "B: " << std::is_volatile<B>::value << std::endl;
std::cout << "C: " << std::is_volatile<C>::value << std::endl;
std::cout << "D: " << std::is_volatile<D>::value << std::endl;
std::cout << "E: " << std::is_volatile<E>::value << std::endl;
return 0;
}
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