Lots of discussion from two days ago here: <a href="https://news.ycombinator.com/item?id=11579676" rel="nofollow">https://news.ycombinator.com/item?id=11579676</a>.
The last time this was posted, it was mentioned that the new default C++ language mode is c++14, but it's actually gnu++14, which is more a superset of c++14.