26 Feb
2010
26 Feb
'10
6:41 p.m.
Emil Dotchevski wrote:
On Fri, Feb 26, 2010 at 3:54 AM, Peter Dimov <pdimov@pdimov.com> 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. Two std::exception bases, or two boost::exception bases, can occur, but the virtual inheritance from runtime_error cannot help.