C++之可变模板参数打印及Pari的逐块式构造（Piecewise Construction）

class Foo
{
public:
    Foo(tuple<int, double>)
    {
        cout << "Foo(tuple<int, double>)"<< endl;
    }
    template <typename T>
    void print(T t)
    {
        cout << t << endl;
    }

    template <typename T, typename ...Args>
    void print(T t, Args... args)
    {
        cout << t << endl;
        print(args...);
    }

    template <typename... Args>
    Foo(Args... args)
    {
        cout << __FUNCTION__ << "Foo(Args... args)"<< endl;
        //int arr[] = {(print(args), 0)...};
        print(args...);
    }
};
int main(int argc, char *argv[])

{
    QCoreApplication a(argc, argv);

    auto tp = make_tuple(1,2.22);

    pair<int, Foo> p1(42, tp);

    pair<int, Foo> p2(piecewise_construct, make_tuple(41), tp);

    return a.exec();

}