#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include <algorithm>
using namespace std;
#include <vector>
#include <string>
#include <functional>
/*
find算法 查找元素
@param beg 容器开始迭代器
@param end 容器结束迭代器
@param value 查找的元素
@return 返回查找元素的位置
*/
void test01()
{vector<int>v;for (int i = 0; i < 10;i++){v.push_back(i);}vector<int>::iterator pos = find(v.begin(), v.end(), 5);if (pos!=v.end()){cout << "找到了数据：" << *pos << endl;}else{cout << "未找到" << endl;}}class Person
{
public:Person(string name, int age){this->m_Name = name;this->m_Age = age;}bool operator==( const Person&p){if (this->m_Name == p.m_Name && this->m_Age == p.m_Age){return true;}return false;}string m_Name;int m_Age;
};
//利用find查找自定义数据类型
void test02()
{vector<Person>v;Person p1("aaa", 10);Person p2("bbb", 20);Person p3("ccc", 30);Person p4("ddd", 40);v.push_back(p1);v.push_back(p2);v.push_back(p3);v.push_back(p4);vector<Person>::iterator pos = find(v.begin(), v.end(), p2);if (pos != v.end()){cout << "找到了数据姓名：" << (*pos).m_Name << " 年龄：" << pos->m_Age << endl;}else{cout << "未找到" << endl;}
}class MyCompare :public binary_function<Person*, Person* ,bool>
{
public:bool operator()( Person * p1 , Person * p2) const{if (p1->m_Name == p2->m_Name && p1->m_Age == p2->m_Age){return true;}return false;}};
void test03()
{vector<Person *>v;Person p1("aaa", 10);Person p2("bbb", 20);Person p3("ccc", 30);Person p4("ddd", 40);v.push_back(&p1);v.push_back(&p2);v.push_back(&p3);v.push_back(&p4);Person * p = new Person("bbb", 20);vector<Person*>::iterator pos = find_if(v.begin(), v.end(),  bind2nd( MyCompare(), p));if (pos != v.end()){cout << "找到了数据姓名：" << (*pos)->m_Name << " 年龄：" << (*pos)->m_Age << endl;}else{cout << "未找到" << endl;}
}/*
adjacent_find算法 查找相邻重复元素
@param beg 容器开始迭代器
@param end 容器结束迭代器
@param  _callback 回调函数或者谓词(返回bool类型的函数对象)
@return 返回相邻元素的第一个位置的迭代器
*/
void test04()
{vector<int>v;v.push_back(2);v.push_back(3);v.push_back(4);v.push_back(5);v.push_back(5);v.push_back(6);v.push_back(2);vector<int>::iterator pos = adjacent_find(v.begin(), v.end());if (pos!= v.end()){cout << "找到了相邻重复元素为： " << *pos << endl;}else{cout << "未找到" << endl;}}/*
binary_search算法 二分查找法
注意: 在无序序列中不可用
@param beg 容器开始迭代器
@param end 容器结束迭代器
@param value 查找的元素
@return bool 查找返回true 否则false
*/
void test05()
{vector<int>v;for (int i = 0; i < 10;i++){v.push_back(i);}bool ret =  binary_search(v.begin(), v.end(), 4);if (ret){cout << "找到了4" << endl;}else{cout << "未找到" << endl;}}/*
/*
count算法 统计元素出现次数
@param beg 容器开始迭代器
@param end 容器结束迭代器
@param  value回调函数或者谓词(返回bool类型的函数对象)
@return int返回元素个数
*//*
count_if算法 统计元素出现次数
@param beg 容器开始迭代器
@param end 容器结束迭代器
@param  callback 回调函数或者谓词(返回bool类型的函数对象)
@return int返回元素个数*/
class GreaterThenFour
{public:bool operator()(int v){return v >= 4;}};
void test06()
{vector<int>v;for (int i = 0; i < 10; i++){v.push_back(i);}v.push_back(4);v.push_back(4);v.push_back(4);v.push_back(4);int num = count(v.begin(), v.end(), 4);cout << "4的个数为" << num << endl;num = count_if(v.begin(), v.end(), GreaterThenFour());cout << "大于等于 4的个数为" << num << endl;}int main(){//test01();//test02();//test03();//test04();//test05();test06();system("pause");return EXIT_SUCCESS;
}