on Fri Jan 09 2009, "Simonson, Lucanus J" <lucanus.j.simonson-AT-intel.com> wrote:
I think it was gcc 3.4.2, but it might have been gcc 3.2.2. I don't clearly remember. I pretty much stopped worrying about it when I found that it isn't a problem with current compilers and I was no longer planning to do it anyhow. No need for bug report.
That's in boost/type_traits/is_convertible.hpp; I didn't have to implement it!
Nice. Good to know. How does it work?
Use the source, Luke.
If you use SFINAE in the traditional way, you can't take advantage of any refinement relationships and you need to explicitly exclude all the other cases. Of course, you could use SFINAE with an is_convertible test on the tags, which would get around that problem. But I would still do that on the dispatch function and use tags to select the implementation.
Yes, saves some typing of SFINAE meta-logic.
Not just typing; also coupling and maintenance nightmares. Cheers, -- Dave Abrahams BoostPro Computing http://www.boostpro.com