message: Comment side_pair.h - mostly to test GitHub export.
diff: @@ -20,8 +20,18 @@ limitations under the License.
  namespace ruy {
  -enum class Side { kLhs = 0, kRhs = 1 };
  +// Enumeration of the sides, i.e. the operands 'slots', in a matrix
  +// multiplication. The numerical values of these enumeration constants matter
  +// because these will be used as indices into the array underlying a SidePair.
  +enum class Side {
  + // Left-hand side
  + kLhs = 0,
  + // Right-hand side
  + kRhs = 1
  +};
  +// SidePair is a pair container where the two elements are indexed by a Side
  +// enum.
  template <typename T>
  class SidePair final {
  public:
  