用 C plus plus 写一个建造者模式

好的，您可以参考以下代码实现：

#include<iostream>
using namespace std;

//产品类
class Product
{
public:
    void setPartA(const string& s)
    {
        partA = s;
    }
    void setPartB(const string& s)
    {
        partB = s;
    }
    void setPartC(const string& s)
    {
        partC = s;
    }
    void show()
    {
        cout << "PartA:" << partA << endl;
        cout << "PartB:" << partB << endl;
        cout << "PartC:" << partC << endl;
    }
private:
    string partA;
    string partB;
    string partC;
};

//抽象建造者
class Builder
{
public:
    virtual void buildPartA() = 0;
    virtual void buildPartB() = 0;
    virtual void buildPartC() = 0;
    virtual Product* getResult() = 0;
};

//具体建造者
class ConcreteBuilder : public Builder
{
public:
    ConcreteBuilder()
    {
        product = new Product();
    }
    void buildPartA()
    {
        product->setPartA("A");
    }
    void buildPartB()
    {
        product->setPartB("B");
    }
    void buildPartC()
    {
        product->setPartC("C");
    }
    Product* getResult()
    {
        return product;
    }
private:
    Product* product;
};

//指挥者
class Director
{
public:
    Director(Builder* builder)
    {
        this->builder = builder;
    }
    void construct()
    {
        builder->buildPartA();
        builder->buildPartB();
        builder->buildPartC();
    }
private:
    Builder* builder;
};

int main()
{
    Builder* builder = new ConcreteBuilder();
    Director* director = new Director(builder);
    director->construct();
    Product* product = builder->getResult();
    product->show();
    return 0;
}

以上就是一个用C++编写的建造者模式的实现，希望能够对您有所帮助！