title: Fill std::set at compile time?
body: <p>Is it possible to create (possibly <code>const</code>) <code>std::set</code> that would be filled with elements at compile time?</p>
  
  <p>I am wondering about <code>std::set</code>/<code>std::unordered_set</code> specifically, not a set of templated functions that would emulate behaviour of a set.</p>