摘要：本文主要讲了适配器的一些内容，重要的是了解适配器使用的步骤。
1 #include<iostream> 2 #include<vector> 3 #include <algorithm> 4 #include<functional> 5 #include <string> 6 7 using namespace std; 8 9 //第一步 绑定 数据 bind2nd 10 //继承类 binary_function<参数类型1 ，参数类型2 ，返回值类型> 11 //加const修饰 operator() 12 class MyPrint:public binary_function<int,int,void> { 13 public: 14 void operator()(int v,int start)const{ 15 cout << v+start << endl; 16 } 17 }; 18 void test01() { 19 vector<int>v; 20 for (int i=0;i<10;i++) 21 { 22 v.push_back(i); 23 } 24 cout << "请输入起始值" << endl; 25 int num; 26 cin >> num; 27 for_each(v.begin(), v.end(),bind2nd(MyPrint(),num)); 28 } 29 30 class GreaterThenFive :public unary_function<int, bool> 31 { 32 public: 33 bool operator()(int v) const 34 { 35 return v > 5; 36 } 37 }; 38 39 void test02() { 40 vector<int>v; 41 for (int i=0;i<10;i++) 42 { 43 v.push_back(i); 44 } 45 vector<int>::iterator pos = find_if(v.begin(), v.end(), not1(GreaterThenFive())); 46 //vector<int>::iterator pos = find_if(v.begin(),v.end(),not1(bind2nd(greater<int>(),5))); //取反适配器，找到的是小于5的数字 47 if (pos!=v.end()) 48 { 49 cout << "找到小于5的数" << *pos << endl; 50 } 51 else { 52 cout << "未找到" << endl; 53 } 54 } 55 56 void MyPrint03(int v, int start) 57 { 58 cout << v + start << endl; 59 } 60 //函数指针适配器 61 void test03() 62 { 63 vector<int>v; 64 for (int i = 0; i < 10; i++) 65 { 66 v.push_back(i); 67 } 68 //将函数指针 适配为 函数对象 69 // ptr_fun 70 for_each(v.begin(), v.end(), bind2nd(ptr_fun(MyPrint03), 100)); 71 } 72 73 //成员函数适配器 74 class Person 75 { 76 public: 77 Person(string name, int age) 78 { 79 this->m_Name = name; 80 this->m_Age = age; 81 } 82 83 void showPerson() 84 { 85 cout << "成员函数中：姓名： " << m_Name << " 年龄：" << m_Age << endl; 86 } 87 void plusAge() 88 { 89 this->m_Age = this->m_Age + 100; 90 } 91 92 string m_Name; 93 int m_Age; 94 }; 95 96 void MyPrintPerson(Person & p) 97 { 98 cout << "姓名： " << p.m_Name << " 年龄：" << p.m_Age << endl; 99 } 100 101 void test04() 102 { 103 vector<Person>v; 104 105 Person p1("aaa", 10); 106 Person p2("bbb", 15); 107 Person p3("ccc", 18); 108 Person p4("ddd", 40); 109 110 v.push_back(p1); 111 v.push_back(p2); 112 v.push_back(p3); 113 v.push_back(p4); 114 115 //成员函数适配器 116 // mem_fun_ref 117 for_each(v.begin(), v.end(), mem_fun_ref(&Person::showPerson)); 118 for_each(v.begin(), v.end(), mem_fun_ref(&Person::plusAge)); 119 for_each(v.begin(), v.end(), mem_fun_ref(&Person::showPerson)); 120 } 121 122 int main() { 123 //test01(); 124 //test02(); 125 //test03(); 126 test04(); 127 system("pause"); 128 return 0; 129 } 来源：博客园
作者：AmingGlaxy
链接：https://www.cnblogs.com/lzy820260594/p/11412645.html