Const initialization issue, looking for solution

[Maxim Fomin]

On Wednesday, 29 May 2013 at 13:30:09 UTC, Jakob Ovrum wrote:
>> However, since const/mutable aliasing is allowed, you can do:
>>
>> union U (T)
>> {
>>   const T ct;
>>   T mt;
>> }
>>
>> because const doesn't mean that object would never change, you 
>> can mutate it through alias. From the opposite view, there is 
>> also no problem in reinterpeting a mutable object as const 
>> object (since mutables can be converted to const).
>>
>> Depending on your mutable indirection situation this can work 
>> or may not.
>
> Mutable indirection is actually not the problem with this 
> solution, it's the casting away of const. There's no guarantee 
> here that the data wasn't actually immutable when it was 
> created.

It is not casting away const and it has nothing to do with 
immutable, also this does not suffer from data was actually 
immutable problem.