7.count查找

#include<iostream>
using namespace std;

#include<vector>
#include<algorithm>

//count(iterator begin, iterator end, value);统计元素出现次数

//统计内置数据类型
void test0701()
{
    vector<int> v;
    for (int i = 0; i < 10; i++)
    {
        v.push_back(i);
    }
    v.push_back(8);

    int cnt = count(v.begin(), v.end(), 8);
    cout << "有" << cnt << "个" << 8 << endl;

}
//统计自定义数据类型
class Person
{
public:
    Person(string name,int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }

    bool operator==(const Person& p)//传常量引用
    {
        if (this->m_Name == p.m_Name && this->m_Age == p.m_Age)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    string m_Name;
    int m_Age;
};
void test0702()
{
    vector<Person> v;
    Person p1("xian", 11);
    Person p2("xian", 11);
    Person p3("si", 12);
    Person p4("xian", 31);
    Person p5("fan", 14);

    v.push_back(p1);
    v.push_back(p2);
    v.push_back(p3);
    v.push_back(p4);
    v.push_back(p5);

    int cnt = count(v.begin(), v.end(), p1);
    
    cout << "有" << cnt << "个" << p1.m_Name << endl;

}
int main()
{
    test0701();
    test0702();

    system("pause");
    return 0;
}