I’ve seen the
following:
main(){
...
base *b;
...
ar & b;
}
But that doesn’t quite help
me. All of our objects come from a memory pool and I either need to know
ahead of time which object to allocate or I need to pass an allocator to the
archive so that it can get the memory from the pool.
Are either of these possible?
Also, in the above example, how does the archive allocate the memory for
‘b’? Does it use new? Or does it have it’s own pre-allocated
store?
Thanks,
Ryan
From:
boost-users-bounces@lists.boost.org
[mailto:boost-users-bounces@lists.boost.org] On Behalf Of Robert
Ramey
Sent: 04 March 2009 17:30
To:
boost-users@lists.boost.org
Subject: Re: [Boost-users]
[Serialization] Load an object from the base
pointer
This is explained
in the documentation and illustrated by the demos and tests.
In fact, you can
even build a progam which will be able to de-serialize types
included
in DLLS which have
yet to be created.
Hi,
How can I read in a from a stream when I
don’t know the exact type I will be getting? All objects I receive
will derive from the same base class, but I won’t know when I receive the
stream what the derived type will be and therefore I can’t create it in
advance (like in the docs).
class base
{
…
}
class derived1 : public
base
{
…
}
class derived2 : public
base
{
…
}
int main()
{
// Get a stream from
somewhere
boost::archive::binary_iarchive ia( instream );
base
b0;
derived1
d1;
derived2
d2;
is >> //
derived1 or derived2???
}
Ryan
Fowler
Software
Engineer
Thomson
Reuters
Phone: +442075427063
ryan.fowler@thomsonreuters.com
thomsonreuters.com
This email was sent to you by Thomson Reuters, the global news and
information company.
Any views expressed in this message are those of the
individual sender, except where the sender specifically states them to be
the views of Thomson Reuters.
_______________________________________________
Boost-users
mailing
list
Boost-users@lists.boost.org
http://lists.boost.org/mailman/listinfo.cgi/boost-users