在 C++ 中将非 const 转换为 const

2021-12-31 00:00:00 types constants casting c++

我知道您可以使用 const_castconst 转换为非 const.

I know that you can use const_cast to cast a const to a non-const.

但是如果您想将非const 转换为const,您应该使用什么?

But what should you use if you want to cast non-const to const?

推荐答案

const_cast 可用于删除或向对象添加常量.当您想调用特定的重载时,这会很有用.

const_cast can be used in order remove or add constness to an object. This can be useful when you want to call a specific overload.

人为的例子:

class foo {
    int i;
public:
    foo(int i) : i(i) { }

    int bar() const {
        return i;    
    }

    int bar() { // not const
        i++;
        return const_cast<const foo*>(this)->bar(); 
    }
};

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