Re: Serialization

From:
Andrea Crotti <andrea.crotti.0@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Mon, 08 Nov 2010 13:51:43 +0100
Message-ID:
<m1lj54f068.fsf@ip1-201.halifax.rwth-aachen.de>
Andrea Crotti <andrea.crotti.0@gmail.com> writes:

Ebenezer <woodbrian77@gmail.com> writes:

This change is now available on line and most of the
on line examples have been updated as well.


Very good thanks, but I still have a question.
What's the right way to convert generic types to a
std::vector<unsigned char>?

I mean should I maybe
- compute the size
- allocate the right space on the vector considering that every element
  is just one byte
- memcpy (should be contigous the memory)

Or is there another way?
If for example I want to serialize a

vector<long> -> vector<char>

vector<char> convert(vector<long>& l)
{
        vector<char> res;
        size_t size = sizeof(long) * l.size();
        res.resize(size);
        memcpy(&res, &l, size);
        return res;
}

Or am I getting into troubles with something like this??


Looks like that using memcpy with vectors is not really nice...
But in this case do I have any choice?
How do I fit those bigger types into smaller types otherwise?

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