Demo备忘，占坑

#include 
     
      #include 
      
       #include 
       
        using namespace std;using namespace std::placeholders;const static int T_NUM = 10;bool test_functional(const std::function
        
          &f, int t) {	return f(t);}struct test_struct{	public:		bool operator()(int t) {			if (t > T_NUM) {				buffer.push_back(t);			}			return true;		}	public:		std::vector
         
           buffer;};int test_binder_functional(int a, int b) {	return a+b;}int test_binder_function2(int &a) {	return ++a;}class BindTestClass {	public:		BindTestClass(std::string name="") : name_(name) {}		void Print(std::string prefix="") { std::cout << prefix << " " << name_ << std::endl;}	private:		std::string name_ {""};};int main(){	//函数对象	test_struct t;	test_functional(t,9);	test_functional(t,10);	test_functional(t,11);	test_functional(t,12);	//打印不出任何东西，函数对象到 std::function存在隐式转换	for(auto it=t.buffer.begin(); it != t.buffer.end(); it++) {		std::cout << *it << std::endl;	}	//-------------------------------	// lambda	std::vector
          
            buffer; std::function
           
             test_f = [&buffer](int t)->bool { if (t > T_NUM) { buffer.push_back(t); } }; test_functional(test_f,9); test_functional(test_f,10); test_functional(test_f,11); test_functional(test_f,12); // 打印 11,12 for(auto it=buffer.begin(); it != buffer.end(); it++) { std::cout << *it << std::endl; } //-------------------------------- // bind的使用 // bind 固定某个参数 auto bind_test_f = std::bind(test_binder_functional,_1,10); std::cout << bind_test_f(10) << std::endl; // bind auto divide_f = std::bind(std::divides
            
             (), _1, 7); std::cout << divide_f(49) << std::endl; // nesting bind 嵌套bind auto time3_f = std::bind(std::multiplies
             
              (), _1, std::bind(std::multiplies
              
               (),_1,_1)); std::cout << time3_f(10) << std::endl; std::cout << time3_f(20) << std::endl; // bind_num_v will not change 引用bind需要加 ref 修饰 int bind_num_v = 10; auto bind_num_f = std::bind(test_binder_function2,bind_num_v); bind_num_f(); std::cout << bind_num_v << std::endl; // bind_num_v will change auto bind_num_f_c = std::bind(test_binder_function2,ref(bind_num_v)); bind_num_f_c(); std::cout << bind_num_v << std::endl; // bind class function 绑定类成员函数 auto class_bind_f = std::bind(&BindTestClass::Print, _1, "my name is："); BindTestClass bindc("nicolas"); class_bind_f(bindc); return 0;}