This patch adds support for a few of new C++11 features. I added only the ones easy to implement (basically, just adding keywords to lists), since I'm not familiar with the way cc-mode works. Hope this patch is not controversial. I submitted required legal papers years ago, you can find a few my patches in ChangeLog.
2014-01-25 Paul Pogonyshev <address@hidden
* progmodes/cc-langs.el: Support some of the new keywords in
(c-operators): Handle `alignof' and `decltype'.
(c-primitive-type-kwds): Add `char16_t' and `char32_t' primitive
(c-type-modifier-kwds): Add `constexpr' and `thread_local'.
(c-constant-kwds): Add `nullptr'.