从 const 类继承

2022-01-24 00:00:00 inheritance constants c++

我想从具有 const 说明符的类继承，如下所示:

I would like to inherit from a class with the const specifier like this:

class Property
{
    int get() const;
    void set(int a);
};

class ConstChild : public const Property
{
    // Can never call A::set() with this class, even if
    // the instantiation of this class is not const
};

class NonConstChild : public Property
{
    // Can call both A::set() and A::get() depending on 
    // the constness of instantiation of this class
};

我的编译器显然给了我第二个类声明中的 const 关键字的错误.理想情况下，我希望避免创建一个新类 ReadOnlyProperty，ConstChild 将从该类继承.

My compiler obviously gives me an error for the const keyword in the second classes declaration. Ideally I'd like to avoid having to create a new class ReadOnlyProperty from which ConstChild would inherit.

我可以使用 const 关键字进行继承吗?

Can I somehow use the const keyword for inheritance?

  • 如果没有，您对如何解决这个问题还有其他想法吗?

推荐答案

稍后在继承树中引入可变性并适当派生:

Introduce mutability later in your inheritance tree and derive appropriately:

class Property
{
    int get() const;
};
class MutableProperty : public Property {
{
    void set(int a);
};

然后:

class ConstChild : public Property { ... };
class MutableChild : public MutableProperty { ... };

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