生成器模式

生成器模式 封装一个产品的构造过程，并允许按步骤构造。

#include <iostream>

using namespace std;

struct AbstractBuilder {
public:
    virtual void buildDay(string day) = 0;
    virtual void addHotel(string name) = 0;
    virtual void addReservation(string name) = 0;
    virtual void addSpecialEvent(string event) = 0;
    virtual void addTickets(string tickets) = 0;
    virtual string getVacationPlanner(void) = 0;
};

struct VacationBuilder : public AbstractBuilder {
public:
    VacationBuilder() : msg("") {}
    virtual void buildDay(string day) {
        msg += "Day : " + day + "\n";
    }
    virtual void addHotel(string name) {
        msg += "Hotel : " + name + "\n";
    }
    virtual void addReservation(string name) {
        msg += "Reservation : " + name + "\n";
    }
    virtual void addSpecialEvent(string event) {
        msg += "SpecialEvent : " + event + "\n";
    }
    virtual void addTickets(string tickets) {
        msg += "Tickets : " + tickets + "\n";
    }
    virtual string getVacationPlanner(void) {
        return msg;
    }
private:
    string msg;
};


int main(int argc, char **argv)
{
    VacationBuilder *builder = new VacationBuilder();

    builder->buildDay("2016/10/29");
    builder->addHotel("Grand Facadian");
    builder->addTickets("Patterns on Ice");
    //...
    string yourPlanner = builder->getVacationPlanner();
    cout << "yourPlanner : " << endl;
    cout << yourPlanner << endl;
}