Re: [Boost-users] Serialization with pointer to const object

Subject: Re: [Boost-users] Serialization with pointer to const object
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-07-31 11:05:45

use a const_cast.

Robert Ramey

Soumen wrote:
> Hi Robert,
>
> I guess there's no direct way through which I can throw away
> const-ness during serialization. One way is to modify my class to
> remove const-ness for the pointee or use some temporary var which is
> non-const and serialize using that. Right? Or is there a better way -
> in that case I'll follow that till the issue gets resolved,
> hopefully, in boost.
>
> Regards,
> ~ Soumen
>
>
> Robert Ramey wrote:
>>
>> The question is under consideration.  It won't be resolved for a
>> while. And
>> such resolution might or might not mean a change.  To get over the
>> hump, you
>> might want to
>> just use a const_cast.
>>
>> Robert Ramey
>>
>> Soumen wrote:
>>> So finally to summarize it means that for now I cannot serialize
>>> pointers to const obj. And I need to update my code to throw away
>>> the const. Is that correct?
>>>
>>> Regards,
>>> ~ Soumen
>>>
>>>
>>> Sohail Somani-2 wrote:
>>>>
>>>> Emil Dotchevski wrote:
>>>>> On Fri, Jul 24, 2009 at 8:06 PM, Robert Ramey<ramey_at_[hidden]>
>>>>> wrote:
>>>>>> Emil Dotchevski wrote:
>>>>>>> On Fri, Jul 24, 2009 at 4:40 PM, Robert Ramey<ramey_at_[hidden]>
>>>>>>> wrote:
>>>>>> would be equivalent to
>>>>>>    ar >> *m_x
>>>>>> in which case the "const" would be violated.
>>>>>
>>>>> At the time the object needs to be instantiated and read, instead
>>>>> of dealing with a T const * p as:
>>>>>
>>>>> p=new T;
>>>>> ar >> *p;
>>>>>
>>>>> what's wrong with:
>>>>>
>>>>> T * tmp=new T;
>>>>> ar >> * tmp;
>>>>> p=tmp;
>>>>
>>>> This reminded me of the same issue with shared_ptr<const T>
>>>> https://svn.boost.org/trac/boost/ticket/3123
>>>>
>>>> I'm not sure Robert is applying const correctness correctly here.
>>>>
>>>> There is no "const violation" here. If there was, you'd see a
>>>> const_cast in the patch somewhere.
>>>>
>>>> --
>>>> Sohail Somani
>>>> http://uint32t.blogspot.com
>>>>
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>>
>>
>>
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