STL之适配器

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。

#include<iostream>
#include<vector>
#include <algorithm>
#include<functional>
#include <string>

using namespace std;

//第一步 绑定 数据 bind2nd
//继承类 binary_function<参数类型1 ，参数类型2 ，返回值类型>
//加const修饰 operator()
class MyPrint:public binary_function<int,int,void> {
public:
    void operator()(int v,int start)const{
        cout << v+start << endl;
    }
};
void test01() {
    vector<int>v;
    for (int i=0;i<10;i++)
    {
        v.push_back(i);
    }
    cout << "请输入起始值" << endl;
    int num;
    cin >> num;
    for_each(v.begin(), v.end(),bind2nd(MyPrint(),num));  
}

class GreaterThenFive :public unary_function<int, bool>
{
public:
    bool operator()(int v) const
    {
        return v > 5;
    }
};

void test02() {
    vector<int>v;
    for (int i=0;i<10;i++)
    {
        v.push_back(i);
    }
    vector<int>::iterator pos = find_if(v.begin(), v.end(), not1(GreaterThenFive()));
    //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
    if (pos!=v.end())
    {
        cout << "找到小于5的数" << *pos << endl;
    }
    else {
        cout << "未找到" << endl;
    }
}

void MyPrint03(int v, int start)
{
    cout << v + start << endl;
}
//函数指针适配器
void test03()
{
    vector<int>v;
    for (int i = 0; i < 10; i++)
    {
        v.push_back(i);
    }
    //将函数指针 适配为 函数对象
    // ptr_fun
    for_each(v.begin(), v.end(), bind2nd(ptr_fun(MyPrint03), 100));
}

//成员函数适配器
class Person
{
public:
    Person(string name, int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }

    void showPerson()
    {
        cout << "成员函数中：姓名： " << m_Name << " 年龄：" << m_Age << endl;
    }
    void plusAge()
    {
        this->m_Age = this->m_Age + 100;
    }

    string m_Name;
    int m_Age;
};

void MyPrintPerson(Person & p)
{
    cout << "姓名： " << p.m_Name << " 年龄：" << p.m_Age << endl;
}

void test04()
{
    vector<Person>v;

    Person p1("aaa", 10);
    Person p2("bbb", 15);
    Person p3("ccc", 18);
    Person p4("ddd", 40);

    v.push_back(p1);
    v.push_back(p2);
    v.push_back(p3);
    v.push_back(p4);

    //成员函数适配器
    // mem_fun_ref
    for_each(v.begin(), v.end(), mem_fun_ref(&Person::showPerson));
    for_each(v.begin(), v.end(), mem_fun_ref(&Person::plusAge));
    for_each(v.begin(), v.end(), mem_fun_ref(&Person::showPerson));
}

int main() {
    //test01();
    //test02();
    //test03();
    test04();
    system("pause");
    return 0;
}