static_vector::operator== should be constexpr

[HazardyKnusperkeks]

We never allocate so everything can easily be done in constexpr, or do I miss something?

[timblechmann]

actually, i wonder if all of static_vector could potentially be constexpr

[localspook]

actually, i wonder if all of static_vector could potentially be constexpr

It can be! There's a static_vector standards proposal and a reference implementation, all constexpr.

[gast128]

Indeed if possible make constructors constexpr as well so that one can e.g. write:
inline constexpr boost::container::static_vector<int, 4> g_vec{1, 2, 3, 4};