继承自const类 [英] Inherit from const class

问题描述

我想继承一个带有 const 说明符的类，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 const 第二个类声明中的关键字。理想情况下，我想避免创建一个新的 ReadOnlyProperty 类 ConstChild 将继承。

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.

我可以以某种方式使用 const 关键字进行继承吗？

Can I somehow use the const keyword for inheritance?

• 如果没有，你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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