#include <iostream>
#include <iomanip>
 
using namespace std;
 
template <typename T, typename = void>
struct SupportsOstreamOperator : std::false_type {};
template <typename T>
struct SupportsOstreamOperator<T,
                               decltype(void(std::declval<std::ostream>()
                                             << std::declval<T>()))>
    : std::true_type {};
 
    struct Test{};
 
int main(int argc, char * argv[])
{
    cout << SupportsOstreamOperator<int>::value << endl;
    cout << SupportsOstreamOperator<Test>::value << endl;
}
 

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