Re: [Boost-users] [archive] binary archive to memory stream

Subject: Re: [Boost-users] [archive] binary archive to memory stream
From: Michael Powell (mwpowellhtx_at_[hidden])
Date: 2014-06-18 19:49:39

On Wed, Jun 18, 2014 at 5:20 PM, Michael Powell <mwpowellhtx_at_[hidden]> wrote:
> On Wed, Jun 18, 2014 at 10:56 AM, John Maddock <boost.regex_at_[hidden]> wrote:
>>> I am wrapping my head around archive, specifically binary archive.
>>>
>>> I'd like to serialize a vector of objects in such a way, I need to
>>> capture intermediate vector buffers (literally, to vector of uint8_t)
>>> so that I can determine their sizes.
>>>
>>> After which point the parent object(s) can serialize to file using
>>> more conventional, built-in file streams and such.
>>>
>>> It seems that binary_oarchive is helpful, but still requires there be
>>> an ostream or streambuf in the mix. Which, as an adapter layer, while
>>> helpful, it still leaves the question of extending streambuf to work
>>> with ostream to vector<uint8_t> open.
>>>
>>> I've read some docs on vectors and streambuf, but they all seem to be
>>> geared towards a known-size vector, istream and such. I am interested
>>> in a vector that can be streamed to, will grow in size, etc. Some
>>> clues seem to hint at underflow, overflow type issues?
>>>
>>> Any helpful pointers how to go about doing this?
>>
>>
>> Rather than serializing to a vector, can you not serialize to a stringstream
>> opened in binary mode?  I believe that will still give you all the
>> information you require?

It works. If I really wanted to I could throw the Boost decoration on
top of it, but so far not necessary. Thanks.

> So far so good I think. This is binary data, not "string" data. Or at
> least, not to be confused with C-style-string, null-terminator
> characters, per se. No chance of that being the case with
> stringstream, extracting using the str() function, and so on?
>
> Thank you...
>
>> HTH, John.
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