Re: Persistence Library Needed in Boost? (Was: [boost] A tip from the Dr.)

From: Matthias Troyer (troyer_at_[hidden])
Date: 2002-02-14 02:02:33

On Wednesday, February 13, 2002, at 06:19  PM, quendezus wrote:
>>
>> No, I need at least three different types of streams at runtime.
>> That's why I think I need some type of polymorphism (templates or
>> virtual functions) on the stream.
>>
>> Matthias
>
> Ok, I think you are right: the person who calls the serialization
> function should be able to transmit some info to the serialization
> code (in your case, the stream to format the output). I realize this
> is necessary.
>
> Therefore the type of the stream (or the type of a context class)
> should be a template parameter :
>
> template < class T, class Context >
> void serialize( std::streambuf& dest, const T& t, Context& t )
>
> or:
>
> template < class T, class Stream >
> void serialize( Stream& dest, const T& t )
>
> I have already tried a solution like that and it seems to work but it
> is complicated. I will think about how to simplify it.

Jen's library already does this in a very elegant way using
templates. My concern was that it seems in some cases I need
runtime-polymorphism using virtual functions.

Matthias