181   // Renumber utility nodes so they can be used to index into Signatures  in runIterations()
187   // Initialize signatures  in runIterations()
188   SignaturesT Signatures(/*Size=*/UtilityNodeIndex.size());  in runIterations()  local
191       assert(UN < Signatures.size());  in runIterations()
193         Signatures[UN].LeftCount++;  in runIterations()
195         Signatures[UN].RightCount++;  in runIterations()
202         runIteration(Nodes, LeftBucket, RightBucket, Signatures, RNG);  in runIterations()
211                                             SignaturesT &Signatures,  in runIteration()  argument
214   for (auto &Signature : Signatures) {  in runIteration()
235     float Gain = moveGain(N, FromLeftToRight, Signatures);  in runIteration()
260     if (moveFunctionNode(*LeftNode, LeftBucket, RightBucket, Signatures, RNG))  in runIteration()
262     if (moveFunctionNode(*RightNode, LeftBucket, RightBucket, Signatures, RNG))  in runIteration()
271                                             SignaturesT &Signatures,  in moveFunctionNode()  argument
282   // Update signatures and invalidate gain cache  in moveFunctionNode()
285       auto &Signature = Signatures[UN];  in moveFunctionNode()
292       auto &Signature = Signatures[UN];  in moveFunctionNode()
318                                      const SignaturesT &Signatures) {  in moveGain()  argument
321     Gain += (FromLeftToRight ? Signatures[UN].CachedGainLR  in moveGain()
322                              : Signatures[UN].CachedGainRL);  in moveGain()