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// is_empty example
#include <iostream>
#include <type_traits>
struct A { };
struct B { void fn(){} };
struct C { int x; };
int main() {
std::cout << std::boolalpha;
std::cout << "is_empty:" << std::endl;
std::cout << "int: " << std::is_empty<int>::value << std::endl;
std::cout << "A: " << std::is_empty<A>::value << std::endl;
std::cout << "B: " << std::is_empty<B>::value << std::endl;
std::cout << "C: " << std::is_empty<C>::value << std::endl;
return 0;
}
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