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// is_union example
#include <iostream>
#include <type_traits>
union A { int i; float f; }; // named union
struct B {
union { int foo; float bar; }; // anonymous member union
};
int main() {
std::cout << std::boolalpha;
std::cout << "is_union:" << std::endl;
std::cout << "int: " << std::is_union<int>::value << std::endl;
std::cout << "A: " << std::is_union<A>::value << std::endl;
std::cout << "B: " << std::is_union<B>::value << std::endl;
return 0;
}
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