Re: [boost] [exception] virtual inheritance troubles

Subject: Re: [boost] [exception] virtual inheritance troubles
From: Emil Dotchevski (emildotchevski_at_[hidden])
Date: 2010-02-26 14:40:31

On Fri, Feb 26, 2010 at 10:41 AM, Peter Dimov <pdimov_at_[hidden]> wrote:
> Emil Dotchevski wrote:
>> On Fri, Feb 26, 2010 at 3:54 AM, Peter Dimov <pdimov_at_[hidden]>
>> wrote:
>>> Eric Niebler wrote:
>>>> struct regex_error
>>>>> virtual std::runtime_error
>>>> , virtual boost::exception
>>>
>>> There is no need to derive virtually from runtime_error. As you say
>>> below, this serves no purpose.
>>
>> The purpose it serves is that someone catching std::runtime_error
>> won't get silent errors, even though there is still a problem with
>> std::exception.
>
> I think that this can only happen if a derived class somehow ends up with
> two runtime_error bases; this is unlikely.

It is less likely compared to std::exception, but it is still a
possibility and I don't see why it shouldn't be avoided if possible
(it isn't possible for std::exception in this case, but it is possible
for std::runtime_error.)

Emil Dotchevski
Reverge Studios, Inc.
http://www.revergestudios.com/reblog/index.php?n=ReCode