C++11 placeholder placeholders and function bind usage

#include <iostream> #include <string> #include <functional>using namespace std;using namespace std:: placeholders;  void Test (int i, double D, const string &s) {cout << "i=" << I << "d=" << D << "s= "<< s << endl;}  int test1 (int i, double D, const string &s) {cout << "i=" << I << "d=" << D << "s=    "<< s << endl; return i;}    int main (int argc, const char *argv[]) {function<void (void) > fp;    string s = "Foo";    int a = 3;    Double b = 6.7;    fp = bind (&test, A, B, s);     FP ();    function <void (int, const string&) > FP1;    Double b2 = 4.6;    FP1 = bind (test, _1, B2, _2);     FP1 (4, "kity");    function <int (int, const string&) > FP2;    FP2 = bind<int> (Test1, _1, B2, _2);    int y = FP2 (4, "kity");     cout << y << Endl;     AUTO FN = bind (test, ten, 23.3, "Heko");//function parameter not specified, FN (); Auto FF = Bind (test, _1, _3, _2); the I parameter type in//bind corresponds to the parameter type of _j of test FF ("PPP", 12.5); Class A {public:void print (int a, double x) {cout << A << "            "<< x << Endl;    }    };    A A3;    Auto fclass= bind (&a::p rint, &AMP;A3, 11, 7.7);    Fclass (); return 0;}


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C++11 placeholder placeholders and function bind usage