#include <iostream>
#include <type_traits>

using namespace std;

//template <typename T>
//decltype(T(), declval<bool>()) isConstructable() { return true; }

template <typename T>
enable_if_t<decltype(T(), true_type())::value, bool> isConstructable() { return true; }

int main() {
	cout << isConstructable<int>() << endl;
}