3.建造模式（Builder）

注：图片来源于 https://www.cnblogs.com/-saligia-/p/10216752.html

建造模式UML图解析：

代码：

Director.h

//
// Created by DELL on 2019/10/15.
//

#ifndef BUILDER_DIRECTOR_H
#define BUILDER_DIRECTOR_H

#include "Builder.h"
class Director {
public:
    explicit Director(PhoneBuilder* pb);
    void Show() {
        builder->build();
        builder->ShowDetail();
    }
private:
    PhoneBuilder* builder;
};

Director::Director(PhoneBuilder *pb) {
    builder = pb;
}

#endif //BUILDER_DIRECTOR_H

Builder.h

//
// Created by DELL on 2019/10/15.
//

#ifndef BUILDER_BUILDER_H
#define BUILDER_BUILDER_H

#include "Product.h"
class PhoneBuilder {
public:
    virtual void build() = 0;
    virtual void ShowDetail() = 0;
};

class HUAWEIBuilder : public PhoneBuilder {
public:
    HUAWEIBuilder() {
        phone = new Phone();
    }
    void build() override {
        phone->setDetail("HM OS", "刘海屏", "8G");
    }
    void ShowDetail() override {
        phone->showDetail();
    }
private:
    Phone* phone;
};

class OPPOBuilder : public PhoneBuilder {
public:
    OPPOBuilder() {
        phone = new Phone();
    }
    void build() override {
        phone->setDetail("Color OS", "全面屏", "6G");
    }
    void ShowDetail() override {
        phone->showDetail();
    }
private:
    Phone* phone;
};
#endif //BUILDER_BUILDER_H

Product.h

//
// Created by DELL on 2019/10/15.
//

#ifndef BUILDER_PRODUCT_H
#define BUILDER_PRODUCT_H

#include <string>
#include <utility>
#include <iostream>
//产品类-手机
class Phone {
public:
    Phone() : phone_os("Android"), phone_shape("刘海屏"), phone_memory("4G"){}
    void setDetail(std::string os, std::string shape, std::string memory) {
        phone_os = std::move(os);
        phone_shape = std::move(shape);
        phone_memory = std::move(memory);
    }
    void showDetail() {
        std::cout << phone_os << " " << phone_shape <<  " " << phone_memory << std::endl;
    }

private:
    std::string phone_os;
    std::string phone_shape;
    std::string phone_memory;
};

#endif //BUILDER_PRODUCT_H

用户 main.cpp

#include <iostream>
#include "Director.h"
#include "Builder.h"
using namespace std;

int main() {
    PhoneBuilder* hw = new HUAWEIBuilder();
    auto* dr1 = new Director(hw);
    dr1->Show();

    PhoneBuilder* op = new OPPOBuilder();
    auto* dr2 = new Director(op);
    dr2->Show();

    return 0;
}