On Sat, Apr 4, 2015 at 4:36 PM, Eric Niebler <eniebler@boost.org> wrote:
Despite what you think, concepts are real and they're coming. If you dislike the Concepts Lite approach, you're not alone, but that's what we're getting.
Late on the reply here, but I just noticed the thread. You know my stance (I am very much against concepts lite). You've stated this many times, but I will reiterate that I would definitely not assume that Concepts Lite is what we're getting. It's yet to be a part of the language and I personally have seen more as opposed to fewer people opposing it as time goes on. There is a mantra of "this is definitely what we're getting in the standard whether you like it or not" that's been spouted by many people involved with or making use of concept-lite, but it's a horribly premature assessment. Just for some perspective: C++0x concepts made it way further along in standardization than where we are with Concepts-Lite right now. The entire taxonomy of standard concepts for C++0x was done and the entire standard library was updated for it in N2914. It STILL got cut. Concepts-lite might not even make it that far due to growing skepticism. It doesn't even come close to fully improving template error messages in the way the C++0x concepts could and its current design entirely precludes us from ever getting there, short of deprecating concepts lite at some point in the future. It's a flawed design and it would be a mistake for it to be in the standard.