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