#include <iostream>#include <utility>#include <tuple>#include <complex>#include <string>using namespace std;// 代码 改编自 C++标准库——自学教程与参考手册  英文第二版//====================================// tuple iotemplate <int IDX,int MAX,typename... Args>struct PRINT_TUPLE{    static void print(ostream& strm, const tuple<Args...>& t){        strm << get<IDX>(t) << (IDX + 1 == MAX ? "" : ",");        PRINT_TUPLE<IDX + 1, MAX, Args...>::print(strm,t);    }};template <int MAX,typename... Args>struct PRINT_TUPLE<MAX, MAX, Args...>{    static void print(ostream& strm, const tuple<Args...>& t){    }};template <typename... Args>ostream& operator << (ostream& strm,    tuple<Args...>& t){    strm << "[";    PRINT_TUPLE<0, sizeof...(Args), Args...>::print(strm,t);    return strm << "]";}//====================================class Foo{public:    Foo(tuple<int, float>){        cout << "Foo::Foo(tuple)" << endl;    }    template <typename... Args>    Foo(Args... args){        cout << "Foo::Foo(atgs...)" << endl;    }};int _tmain(int argc, _TCHAR* argv[]){    // cpp11 后 一些新语法 在STL中得使用    tuple<int, double>t(1,2.22);    pair<int, Foo>p1(42, t);    pair<int, Foo>p2(piecewise_construct, make_tuple(42), t);    // 使用 ref() 表示对变量的引用    int i = 0;    auto p = make_pair(ref(i), ref(i)); // 创建 pair<int&,int&>    ++p.first;    ++p.second;    cout << "i = " << i << endl;    // tie() 演示    pair<char, char> q = make_pair(‘c‘,‘b‘);    char c;    tie(ignore, c) = q; // char c == ‘b‘    //    tuple<string, int, int, complex<double>> tt;    tuple<int, double,string> t1(41,6.3,"nico");    cout << get<0>(t1) << " ";    cout << get<1>(t1) << " ";    cout << get<2>(t1) << " ";    cout << endl;    auto t2 = make_tuple(22,44,"nico");    get<1>(t1) = get<1>(t2);    t1 = t2;        // tuple io    tuple <int, double, string> iot(77, 1.1, "more light");    cout << "io: " << iot << endl;    return 0;}