异常原因#include <iostream> #include<memory> #include<string> using namespace std; class Product { public: virtual void Creat() = 0; }; class ProductA : public Product { public: void Creat() { cout << "创建产品A"; }; }; class ProductB : public Product { public: void Creat() { cout << "创建产品B"; } }; class Factory { public: virtual void makeProduct() = 0; void setProduct(char type_of_product) { if (type_of_product == 'a'){ unique_ptr<Product> productA = make_unique<ProductA>(); this->product = productA.get(); } }; protected: Product* product; }; class Factory1 : public Factory { public: void makeProduct() { cout << "工厂1："; this->product->Creat(); } }; class Factory2 : public Factory { public: void makeProduct() { cout << "工厂2："; this->product->Creat(); } }; int main() { unique_ptr<Product> productA = make_unique<ProductA>(); unique_ptr<Factory> factory1 = make_unique<Factory1>(); factory1->setProduct('A'); factory1->makeProduct(); return 0; }

这份代码中存在一些问题：

1. `Factory::setProduct()` 中只有对产品A的处理，没有对产品B的处理。

2. `Factory::product` 指针没有进行初始化，可能会导致程序崩溃。

3. `unique_ptr<Factory> factory1 = make_unique<Factory1>();` 中的 `Factory1` 类没有定义默认构造函数，因此需要手动提供一个构造函数。

以下是修改后的代码：

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

using namespace std;

class Product {
public:
    virtual void Creat() = 0;
};

class ProductA : public Product {
public:
    void Creat() {
        cout << "创建产品A";
    };
};

class ProductB : public Product {
public:
    void Creat() {
        cout << "创建产品B";
    }
};

class Factory {
public:
    virtual void makeProduct() = 0;
    virtual ~Factory() {}
    void setProduct(char type_of_product) {
        if (type_of_product == 'a') {
            unique_ptr<Product> productA = make_unique<ProductA>();
            this->product = productA.get();
        }
        else if (type_of_product == 'b') {
            unique_ptr<Product> productB = make_unique<ProductB>();
            this->product = productB.get();
        }
    };
protected:
    Product* product = nullptr;
};

class Factory1 : public Factory {
public:
    Factory1() {}
    void makeProduct() {
        cout << "工厂1：";
        if (product) {
            product->Creat();
        }
        else {
            cout << "未设置产品" << endl;
        }
    }
};

class Factory2 : public Factory {
public:
    Factory2() {}
    void makeProduct() {
        cout << "工厂2：";
        if (product) {
            product->Creat();
        }
        else {
            cout << "未设置产品" << endl;
        }
    }
};

int main() {
    unique_ptr<Factory> factory1 = make_unique<Factory1>();
    factory1->setProduct('a');
    factory1->makeProduct();
    return 0;
}

修改后的代码中，`Factory::setProduct()` 中加入了对产品B的处理；`Factory::product` 指针进行了初始化；`Factory1` 和 `Factory2` 中分别添加了默认构造函数并且在 `makeProduct()` 中判断是否设置了产品。