Re: [Boost-users] Using boost::serialization in real-time withoutallocating memory

Subject: Re: [Boost-users] Using boost::serialization in real-time withoutallocating memory
From: Peter Soetens (peter.soetens_at_[hidden])
Date: 2009-09-18 11:18:56

On Fri, Sep 18, 2009 at 14:30, Peter Soetens <peter.soetens_at_[hidden]> wrote:
> On Thu, Sep 17, 2009 at 18:33, Robert Ramey <ramey_at_[hidden]> wrote:
>> Peter Soetens wrote:
>>
>>> I might do what you suggest or look for another serialization
>>> solution.
>>
>> Given the limited scope of what you want to do, it wouldn't be THAT hard to
>> make your own archive.  Take a look at "trivial_archive" in the
>> documentation and build from that.
>
> Encouraged by your and Stefan's suggestions, I've spent another day at
> looking what the possibilities are.
>
> 1. I first created my own binary_?archive classes which inherited from
> common_?archive. This resulted in pulling in the library with the
> 'behind the scenes type tracking'. It seems, inheriting from common is
> not an option for me if I want 'zero-allocation' serialization.
> Correct ? (I also tested the demo_fast_archive.cpp extended with
> no_header, but that one also allocated).
>
> 2. I then tried to work further on Stefan's code snippet. It works,
> but indeed only for 'primitive_type's. I *think* I need functionality
> upto the 'object_serializable' if I want std::vector<T> as well. Since
> Stefan's operator& consumes every T, I'll need one operator& for each
> primitive type, and then an operator& that tries to save/load using
> free functions of the not primitive type.
>
> 3. It looks that I'll have to implement the Archive concept from
> scratch or at least based on Stefan's code and the
> load_binary/save_binary code from binary_?archive.

I'm got so far that I 'hacked' an allocation free output and output
archive, and output works like a charm. But for the input side, I
can't seem to get the ADL to work for serializing the nvt<T> case.

The point I'm struggling with is that sometimes save() is a member
function and sometimes it's a free function, and I can't get to the
selection logic. The archiver in attachment fails to compile on line
68 where it says 'no matching function for call to
‘load(boost::archive::mqueue_tiny_iarchive&, const
boost::serialization::nvp<double>&, int)', when reading back in an
std::vector<double>.

I'm aware that this is no longer an serialization question, but I'm
just one compile error away from the real solution :-) Maybe it
wouldn't hurt to include some examples for serializing level 1/2
objects which just implement the Archive concept interface.

Any hints greatly appreciated.

Peter