Re: [boost] [DynamicAny] Feedback

Subject: Re: [boost] [DynamicAny] Feedback
From: joaquin_at_[hidden]
Date: 2011-03-04 06:46:44

Stewart, Robert escribió:
> joaquin_at_[hidden] wrote:
>
>> Daniel Larimer escribió:
>>
>>
>>> I recently ran into a problem where I wanted to retrieve
>>> the value stored in a boost::any by casting to a base class.
>>> Unfortunately, boost::any requires you cast out the exact
>>> type as that held.
>>>
>>> Boost.DynamicAny is a vairant on Boost.Any which provides
>>> more flexible dynamic casting of the underlying type. Whereas
>>> retreiving a value from Boost.Any requires that you know the
>>> exact type stored within the Any, Boost.DynamicAny allows you
>>> to dynamically cast to either a base or derived class of the
>>> held type.
>>>
>> What's the trade-off? I mean, does Boost.DynamicAny use more
>> memory than Boost.Any, is it slower?
>>
>
> I presume you mean other than the difference between static_cast
> and dynamic_cast?
>
> Couldn't this functionality be added to Boost.Any itself?  That is,
> add another cast that does dynamic_cast so there's only one
> library but clients get a choice about how to extract values.
>

That is exactly my point.

Joaquín M López Muñoz
Telefóinca, Investigación y Desarrollo

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