I see there is still no "expression SFINAE", which makes me very sad, since for me the most really important use-case for decltype() is SFINAE... it basically allow to have C++17 style concepts on top of plain C++11.
I wonder, why is this not planned yet? It feels unreasonable to me that many C++14 features have been added yet this is not there. It is very unconfortable to write cross-platform code this way, since you can not even tell tour team "stick to standard C++11", but instead have to elaborate intricate coding guidelines listing all features that VS don't support (our other compilers, GCC and Clang are quite good at this).
So, could you elaborate a bit on why is this feature not there and what are the plans to add it?
On the other hand, I appreciate a lot that you guys are becoming reachable here. Thanks!