Re: [Boost-users] [Serialization] Strange giant warning

OvermindDL1 wrote:

On Tue, Mar 9, 2010 at 6:38 AM, Avi Bahra wrote:

...

This is caused by a bug in the boost serialisation, well at least in 1.39 Where is assumes that shared ptr must be polymorphic I have already reported a similar problem. i.e

Oh I *SO* hate that bug, so very much.

what makes you think it's a bug in serialization library? If I recall correctly, the motivation for the warning is the following. class base { // no virtual functions here !! ... }; class derived : public base { ... }; BOOST_CLASS_EXPORT(derived); ... base * b = new derived; ar << b; // b will be "sliced" - only the base class part will be serialized !!! In this case the user is almost certainly making a mistake which will be exceeding difficult to find. What's more, he well probably have to send inumermable emails to this list alleging that the serialization library has a bug and I will have do debug his program for him.. If you want to get ride of the warning, either make the base class virtual or use derived *d = new derived; ar << d; I'm speaking from memory and it's possible that the situation has changed since 1.39 and the message is now spurious. If so send a small test case which shows that the library has a bug. Robert Ramey