* Jonathan Wakely: > I think it's very unlikely that constexpr support will decrease. The > trend has been in the opposite direction, to make every function in > the standard library usable in constant expressions. I heard a > suggestion to require implementations to add constexpr to <cmath> > functions just the other day. Many of these functions depend on global state such as the rounding mode. I don't think making them constexpr is a good idea. Thanks, Florian