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Re: Can our C++ vectors hold derived classes?

From: Diego Novillo <dnovillo at google dot com>
To: GCC Mailing List <gcc at gcc dot gnu dot org>, Martin Jambor <mjambor at suse dot cz>
Date: Thu, 13 Jun 2013 06:44:18 -0400
Subject: Re: Can our C++ vectors hold derived classes?
References: <20130612172333 dot GG26236 at virgil dot suse>

On 2013-06-12 13:23 , Martin Jambor wrote:

Hi everyone, but especially Diego :-)

it seems to me that our new C++ vectors have some problems holding
derived classes.  For example, when try to compile the following

The vec implementation in vec.[hc] must be a POD because we storevectors in unions and such. This also means that it can only hold PODsinside of it. This is also why we have such whacky initialization andneed to use a special vNULL instance.

I noted this in the documentation of the new API(http://gcc.gnu.org/wiki/cxx-conversion/cxx-vec), but I think it couldbe more explicit in vec.h or in the texinfo docs (I'm not sure if Iupdated those).



Diego.

References:
- Can our C++ vectors hold derived classes?
  - From: Martin Jambor

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