(C++ : Design-pattern) Builder Pattern

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

// 입학 지원서
using Application = string;     // class Application을 대신한다.

// 지원서 만드는 클래스
class Director
{
    string name = "HONG";
    string phone = "010-111-1111";
    string address = "SEOUL KANGNAMGU";
public:
    Application construct()
    {
        Application app;
        app += name + "\n";
        app += phone + "\n";
        app += address + "\n";
        return app;
    }

    Application XMLconstruct()
    {
        Application app;
        app += "<NAME>" + name + "</NAME>" + "\n";
        app += phone + "\n";
        app += address + "\n";
        return app;
    }
    // 만약 지원서의 규약이 변경되어 address를빼야한다면???
    // 모든 construct의 코드를 수정해야할까??
};

int main()
{
    Director d;

    Application app = d.construct();
    cout << app << endl;
}

struct IBuilder
{
    virtual ~IBuilder() {}
    virtual void makeName(sring name) = 0;
    virtual void makePhone(string phone) = 0;
    virtual void makeAddress(string addr) = 0;

    virtual Application getResult() = 0;
};

class Director
{
    string name = "HONG";
    string phone = "010-111-1111";
    string address = "SEOUL KANGNAMGU";
    IBuilder* pBuilder;
public:
    void setBuilder(IBuilder* p) { pBuilder = p; }
    Application construct()
    {
        pBuilder->setName(name);
        pBuilder->makePhone(name);
        pBuilder->makeAddress(name);
        return pBuilder->getResult;
    }
};

class XMLBuilder : public IBuilder
{
    Application app;
public:
    vitual void makeName(string name)
    {
        app += "<NAME>" + name + "</NAME>\n";
    }
    // ...

    vitual Application getResult() { return app; }
};

int main()
{
    Direct d;
    XMLBuilder xb;
    d.setBuilder(&xb);

    Application app = d.construct();
    cout << app << endl;
}