过滤器模式 C++实现

//
//  main.cpp
//  filter_pattern
//
//  Created by apple on 2019/4/12.
//  Copyright © 2019年 apple. All rights reserved.
//

#include <iostream>
#include "string"
#include "list"
using namespace std;


class Person
{//被过滤的对象的类型
private:
    string name;
    string gender;
    string work_num;
public:
    Person(string name, string gender, string work_num)
    {
        this->name = name;
        this->gender = gender;
        this->work_num = work_num;
    }
    string get_name() {return this->name;}
    string get_gender() {return this->gender;}
    string get_work_num() {return this->work_num;}
};

class Filter
{//过滤器基类
public:
    virtual ~Filter() {}
    virtual list<Person> filter(list<Person> persons) = 0;
    virtual Filter *clone() = 0;
};

class Name_Filter:public Filter
{//名称过滤器
private:
    string name;
public:
    Name_Filter(string name){this->name = name;}
    list<Person> filter(list<Person> persons)
    {
        list<Person> result_persons;
        for (list<Person>::iterator it = persons.begin(); it != persons.end(); ++it)
        {
            if ((*it).get_name().find_first_of(name, 0) != -1)
            {
                result_persons.push_back(*it);
            }
        }
        return result_persons;
    }
    Name_Filter *clone()
    {
        Name_Filter *filter = new Name_Filter("");
        *filter = *this;
        return filter;
    }
};

class Gender_Filter:public Filter
{//性别过滤器
private:
    string gender;
public:
    Gender_Filter(string gender){this->gender = gender;}
    list<Person> filter(list<Person> persons)
    {
        list<Person> result_persons;
        for (list<Person>::iterator it = persons.begin(); it != persons.end(); ++it)
        {
            if ((*it).get_gender() == this->gender)
            {
                result_persons.push_back(*it);
            }
        }
        return result_persons;
    }
    Gender_Filter *clone()
    {
        Gender_Filter *filter = new Gender_Filter("");
        *filter = *this;
        return filter;
    }
};

class WorkNum_Filter:public Filter
{//工号过滤器
private:
    string work_num;
public:
    WorkNum_Filter(string work_num){this->work_num = work_num;}
    list<Person> filter(list<Person> persons)
    {
        list<Person> result_persons;
        for (list<Person>::iterator it = persons.begin(); it != persons.end(); ++it)
        {
            if ((*it).get_work_num().find_first_of(work_num, 0) != -1)
            {
                result_persons.push_back(*it);
            }
        }
        return result_persons;
    }
    WorkNum_Filter *clone()
    {
        WorkNum_Filter *filter = new WorkNum_Filter("");
        *filter = *this;
        return filter;
    }
};

class List_Filter:public Filter
{//过滤管道
private:
    list<Filter *> filters;
public:
    List_Filter(list<Filter *> filters) {this->filters = filters;}
    ~List_Filter()
    {
        for (list<Filter *>::iterator filter = filters.begin(); filter != filters.end(); ++filter)
        {
            delete *filter;
            *filter = NULL;
        }
    }
    list<Person> filter(list<Person> persons)
    {
        list<Person> result_persons = persons;
        for (list<Filter *>::iterator filter = filters.begin(); filter != filters.end(); ++filter)
        {
            result_persons = (*filter)->filter(result_persons);
        }
        return result_persons;
    }
    List_Filter *clone()
    {
        return NULL;
    }
};

void print_Persons(list<Person> persons)
{
    for (list<Person>::iterator person = persons.begin(); person != persons.end(); ++person)
    {
        cout<<(*person).get_name()<<" "<<(*person).get_gender()<<" "<<(*person).get_work_num()<<endl;
    }
}

int main(int argc, const char * argv[]) {
    list<Person> persons;
    persons.push_back(Person("a", "男", "1"));
    persons.push_back(Person("ab", "女", "66"));
    persons.push_back(Person("abc", "男", "166"));
    persons.push_back(Person("b", "男", "61"));
    persons.push_back(Person("bc", "女", "16"));
    persons.push_back(Person("bcd", "男", "21"));
    persons.push_back(Person("c", "女", "88"));
    persons.push_back(Person("cd", "男", "101"));
    persons.push_back(Person("cde", "女", "102"));
    
    list<Filter *> filters;
    
    Filter *filter = new Name_Filter("a");
    print_Persons(filter->filter(persons));
    filters.push_back(filter->clone());
    delete filter;
    cout<<endl;
    
    filter = new Gender_Filter("男");
    print_Persons(filter->filter(persons));
    filters.push_back(filter->clone());
    delete filter;
    cout<<endl;
    
    filter = new WorkNum_Filter("6");
    print_Persons(filter->filter(persons));
    filters.push_back(filter->clone());
    delete filter;
    cout<<endl;
    
    filter = new List_Filter(filters);
    print_Persons(filter->filter(persons));
    delete filter;
    filter = NULL;
    
    return 0;
}

a 男 1
ab 女 66
abc 男 166

a 男 1
abc 男 166
b 男 61
bcd 男 21
cd 男 101

ab 女 66
abc 男 166
b 男 61
bc 女 16

abc 男 166
Program ended with exit code: 0