建造者模式

#include <iostream>
#include <string>
#include <memory>

class Computer{
    public:
        Computer(){};
        void setBoard(const std::string &board) { _board = board; }
        void setDisplay(const std::string &display) { _display = display; }
        virtual void setOs() = 0;
        void showParamaters() {
            std::string param = "Computer Paramaters: \n";
            param += "\tBoard: " + _board + "\n";
            param += "\tDispaly: " + _display + "\n";
            param += "\tOs: " + _os + "\n";
            std::cout << param << std::endl;
        }
    protected:
        std::string _board;
        std::string _display;
        std::string _os;
};
class MacBook : public Computer{
    public:
        virtual void setOs() override {
            _os = "Mac OS x12";
        }
};

class Builder {
    public:
        virtual void buildBoard(const std::string &board) = 0;
        virtual void buildDisplay(const std::string &display) = 0;
        virtual void buildOs() = 0;
        virtual std::shared_ptr<Computer> build() = 0;
};

class MacBookBuilder : public Builder{
    public:
        MacBookBuilder() : _computer(new MacBook()) {}
        void buildBoard(const std::string& board) {
            _computer->setBoard(board);
        }
        void buildDisplay(const std::string& display) {
            _computer->setDisplay(display);
        }
        void buildOs() {
            _computer->setOs();
        }
        std::shared_ptr<Computer> build() {
            return _computer;
        }
    private:
        std::shared_ptr<Computer> _computer;
};

class Director {
    public:
        Director(Builder* builder) : _builder(builder) {}
        void construct(const std::string& board, const std::string& display) {
            _builder->buildBoard(board);
            _builder->buildDisplay(display);
            _builder->buildOs();
        }
    private:
        std::shared_ptr<Builder> _builder;
};


int main() {
    Builder * builder = new MacBookBuilder();
    std::unique_ptr<Director> director(new Director(builder));
    director->construct("华硕主板", "三星显示器");
    std::shared_ptr<Computer> computer = builder->build();
    computer->showParamaters();
    return 0;
}