Ｃ++11 学习笔记之std::function和bind绑定器

#include <iostream>
#include <functional>
 
using namespace std;
 
 void func(void){
     cout << __FUNCTION__ <<endl;
 }
 
 class Foo
 {
 public:
     static int foo_func(int a){
         cout << __FUNCTION__ << "(" << a << ") ->: ";
         return a;
     }
 };
 
 class Bar
 {
 public:
     int operator()(int a){
         cout << __FUNCTION__ << "(" << a << ") ->: ";
         return a;
     }
 };
 
 int main(){
     //綁定一個普通函數
     std::function<void(void)> fry = func;
     fry();
 
     
     //綁定一個類的靜態成員函數
     std::function<int(int)> fr2 = Foo::foo_func;
     cout << fr2(123) << endl;
     
     //綁定一個仿函數
     Bar bar;
     fr2 = bar;
     cout << fr2(123) <<endl;
 
     return 0;
 }

root@ubuntu:~/c++# g++ -std=c++11 func1.cpp -o func
root@ubuntu:~/c++# ./func 
func
foo_func(123) ->: 123
operator()(123) ->: 123
root@ubuntu:~/c++#

#include <iostream>
#include <functional>
 
using namespace std;
 
 class A
 {
 public:
     A(const std::function<void()>& f) :callback_(f){}
     
     void notify(void){
         callback_();
     }
 private:
     std::function<void()> callback_;
 };
 
 class Foo
 {
 public:
     void operator()(void){
         cout <<"in " <<  __FUNCTION__<< endl;
     }
 };
 
 int main(){
     Foo foo;
     A aa(foo);
     aa.notify();
     
     return 0;
 }

"func2.cpp" 32L, 452C written                                              
root@ubuntu:~/c++# g++ -std=c++11 func2.cpp -o func
root@ubuntu:~/c++# ./func
in operator()