c – 对象切片如何导致内存损坏？

发布时间：2020-12-16 09:59:03 所属栏目：百科来源：网络整理

导读：C专家 D语言创建者 Walter Bright说： The slicing problem is serious because it can result in memory corruption,and it is very difficult to guarantee a program does not suffer from it. To design it out of the language,classes that support in

C专家& D语言创建者 Walter Bright说：

The slicing problem is serious because it can result in memory
corruption,and it is very difficult to guarantee a program does not
suffer from it. To design it out of the language,classes that support
inheritance should be accessible by reference only (not by value). The
D programming language has this property.

如果某人通过给出一个C示例来解释它会更好,其中对象切片问题导致内存损坏？ D语言如何解决这个问题？

解决方法

考虑

class Account
{
    char *name = new char[16];

    public: virtual ~Account() { delete[] name; }
    public: virtual void sayHello() { std::cout << "Hello Basen"; }

};

class BankAccount : public Account
{
    private: char *bankName = new char[16];
    public: virtual ~BankAccount() override { delete[] bankName; }
    public: virtual void sayHello() override { std::cout << "Hello Derivedn"; }

};

int main()
{
    BankAccount d;

    Account a1 = d; // slicing
    Account& a2 = d; // no slicing

    a1.sayHello(); // Hello Base
    a2.sayHello(); // Hello Derived

}

当Account :: ~Account而不是BankAccount :: ~BankAccount运行时,a1将泄漏bankName,因为它无法调用多态行为.正如为什么这么具体,它已经被大大解释了here.

（编辑：李大同）

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