C ++中的const声明的区别 [英] Difference between const declarations in C++

问题描述

void func(const Class *myClass)

和

void func(Class *const myClass)

---

另请参阅：

• http ：//stackoverflow.com/questions/269882/c-const-question


• http://stackoverflow.com/questions/455518/how-many-and-which-are-the-uses-of-const -in-c

• http://stackoverflow.com/questions/269882/c-const-question
• http://stackoverflow.com/questions/455518/how-many-and-which-are-the-uses-of-const-in-c

可能还有其他...

推荐答案

区别在于

void func(const Class *myClass)

你指向一个无法更改的类，因为它是const。
但是你可以修改myClass指针（让它指向另一个类;这对调用者没有任何副作用，因为它的指针被复制，它只改变你的本地指针副本）
对比

You point to a class that you cannot change because it is const. But you can modify the myClass pointer (let it point to another class; this don't have any side effects to the caller because it's pointer is copied, it only changes your local the pointer copy) In contrast

void func(Class *const myClass)

现在myClass指向一个可以修改的类，但不能更改参数。

Now myClass points to a class that can be modified while you cannot change the parameter.

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