有关const的问题

[mn_th]

//??因为我不想输出的指针所指向的内容在外部被修改（此处必须把内部指针暴露），所以输出为const * const，
//这样就要求调用时也必须用const * const，这太麻烦了，有没有好的解决办法

[albertjin123]

const_cast 可以帮你去除const

[ajoo]

what is const * const?
should be const xxx*

and avoid using cast in all time.

[albertjin123]

to ajoo(jet pig),
I think it's a good style to write:
int const i = 10 ;
int const * const pI = &i ;

Don't you think it's clearer?

[Last_Dodo]

其实const X *加行了因为你只要求指针指向的对象不能被改变。

[zyf_zsj1]

可以在前面用default定义const

[albertjin123]

后置的const 更方便，比如，

CSome oSome ;
...
CSome const * const & p = &oSome ;

[ajoo]

normally I'll write it in this form:
const X * const
the first const, sice it's closer to X, it means the X pointed to by the pointer cannot be changed.
The second const, since it's closer to the *, it means the pointer variable itself cannot be changed to point to some other address.

Sometimes you need one of them, sometimes you need both, it depends on your requirement.

For example, when writing a function return type, the second const is useless.

[jamesfangjing]

const *就可以了吧！