function bind callback mechanism of C++11

#include <functional>

Using namespace std::p laceholders;

1. The function type can be declared in advance:function< return value (parameter list) > function name;

function< int (int, double, string) > fn

You can also directly bind the front without declaring the type: auto FN = bind (...)

corresponding to the function parameters:

The position of the declaration is corresponding to the parameters of the actual function:

int test (double, string, int)

fn = bind (test, _2, _3, _1) The first type of the-->test parameter is a double, corresponding to the _2 position of the function,

You can also set a constant parameter, FN = bind (test, 3.5, "Hello", 6);

When a member function of the 2.bind class is:

Bind (&a::p rint, &a, ...)

#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 the _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;}

function bind callback mechanism of C++11