Is there a major benefit from using C++14? Not saying that I wouldn't be in favor, but if we can get C++11 for free...
C++14 is definitely too new. For example, TeXLive is going to replace the poppler library with another library written in C because poppler requires C++14, which too many systems don't provide. So please work towards C++11. https://codereview.appspot.com/545320043/
