181 struct MergeGainT {  struct
183   explicit MergeGainT(double Score, size_t MergeOffset, MergeTypeT MergeType)  in MergeGainT()  argument
186   double score() const { return Score; }  in score()
188   size_t mergeOffset() const { return MergeOffset; }  in mergeOffset()
190   MergeTypeT mergeType() const { return MergeType; }  in mergeType()
192   void setMergeType(MergeTypeT Ty) { MergeType = Ty; }  in setMergeType()
195   bool operator<(const MergeGainT &Other) const {  in operator <()
200   void updateIfLessThan(const MergeGainT &Other) {  in updateIfLessThan()
206   double Score{-1.0};
207   size_t MergeOffset{0};
208   MergeTypeT MergeType{MergeTypeT::X_Y};