Function ExactValues

tests/cpp/common/test_quantile.h:462–464

inline bool EmptyReference(ReferenceColumn const& col) { return col.values.empty(); }

inline Span<float const> ExactValues(ReferenceColumn const& col) {
  return {col.values.data(), col.values.size()};
}

inline std::size_t NonZeroWeightCount(GeneratedColumn const& col) {
  return std::count_if(col.weights.cbegin(), col.weights.cend(),