frozen 1.2.0

Header-only library that provides 0 cost initialization for immutable containers and various algorithms. Frozen provides:immutable (a.k.a. frozen), constexpr-compatible versions of std::set, std::unordered_set, std::map and std::unordered_map and 0-cost initialization version of std::search for frozen needles using Boyer-Moore or Knuth-Morris-Pratt algorithms.