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Re: C++ Plugins and virtual destructors.
From: |
Bob Friesenhahn |
Subject: |
Re: C++ Plugins and virtual destructors. |
Date: |
Sun, 11 Nov 2007 17:16:38 -0600 (CST) |
On Mon, 12 Nov 2007, Brendon Costa wrote:
* As for exceptions, I have defined all the methods for the plugins
interface as throw() so exceptions may occur inside the plguin but may
not propagate from the plugin to the application. I honestly dont know
if exceptions occurring only within the plugin may cause any problems?
Hopefully you are aware of what throw() actually requests from the
interface? Hint: It is a request to effectively crash if an attempt
is made to throw an exception through that interface. It is possible
to avoid a true crash, but only by implementing a traditional function
with global scope.
The big question is if the C++ exception catching will work. Someone
else here mentioned RTTI which is a fundamental facility needed for
C++ exceptions since C++ exceptions are captured based on type. If
the C++ exception handling does in fact work, then you can support the
empty throw() contract by ensuring that all exceptions (e.g. failure
of 'new') are caught and handled in some sane way.
May i ask what you mean by "properly mesh"? I was un-aware that C++
plugins which might use exceptions need to do anything in order to
make exceptions work (at least internally). It is something I have not
thought about.
I am not sure exactly. If the C++ support framework for the module
needs to mesh with the overall C++ support framework, then I assume
that it is compiler/OS dependent.
This topic is really interesting to me so I hope that someone with
substantial cross-platform experience with this topic will chime in
soon.
Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
- C++ Plugins and virtual destructors., Brendon Costa, 2007/11/08
- Re: C++ Plugins and virtual destructors., Brendon Costa, 2007/11/11
- Re: C++ Plugins and virtual destructors., Daniel Herring, 2007/11/12
- Re: C++ Plugins and virtual destructors., Ralf Wildenhues, 2007/11/12
- Re: C++ Plugins and virtual destructors., dherring, 2007/11/13
- Re: C++ Plugins and virtual destructors., Roumen Petrov, 2007/11/13