Re: [boost] [Serialization] Pointer to const

From: Loïc Joly (loic.actarus.joly_at_[hidden])
Date: 2005-09-12 15:28:33

Robert Ramey a écrit :

>Loïc Joly wrote:
>  
>
>>Robert Ramey a écrit :
>>
>>    
>>
>>>>Of course, if I replace B const *pc by B *pc, then the code works
>>>>correctly.What can I do to serialize pointers to const data ?
>>>>
>>>>Regards,
>>>>
>>>>
>>>>        
>>>>
>>>Or you could replace this above with:
>>>           ar & const_cast<B *>(pc);
>>>(or maybe const_cast<B * &>(pc)
>>>
>>>      
>>>
>>>But that would override the normal meaning of "const" as applied to
>>>a member variable.
>>>
>>>      
>>>
>>In this case, the member variable is not const. It's not like in
>>http://www.boost.org/libs/serialization/doc/serialization.html#const .
>>It's just a non const pointer that refers to a non const class defined
>>elsewhere, but that promise not to modify that class himself.
>>    
>>
>
>correct.  Its a non-const pointer to a const object. But if the object is 
>const then it is prohibited from being modified.  Serialization has no 
>special privleges in this regard.
>
My only issue is that the other objetc is not const, and in fact, it has 
already been saved before. It is just const seen from A point of view. 
But I understand that is would be quite difficult to differenciate such 
a case from a case where the only access to the B object is through A.

I think I will use this const_cast. This is I think the first time I 
find any use for a const_cast.

Thank you for your help,

-- 
Loïc