These two queries should produce identical code. They do not, one produces blank guys, the other produces a good plot. Note the difference is only in the Tuple.Create guy being used.

Bad C++ Code

		  if ((((*this).MET_RefFinal)/1000.0)<50.0)
		  {
		    map<double, vector<int> > aDictionary_2_945Map;
		    int aInt32_950=0;
		    bool aBoolean_951=false;
		    int aInt32_973=0;
		    bool aBoolean_974=false;
		    int aInt32_944 = (*(*this).AntiKt4TopoEMJets_Calibscale).size();
		    for (int aInt32_943=0; aInt32_943 < aInt32_944; aInt32_943++)
		    {
		      TLorentzVector* aNTLorentzVector_946;
		      TLorentzVector tlz138;
		      tlz138.SetPxPyPzE((((*(*this).AntiKt4TopoEMJets_Calibpx).at(aInt32_943))/1000.0), (((*(*this).AntiKt4TopoEMJets_Calibpy).at(aInt32_943))/1000.0), (((*(*this).AntiKt4TopoEMJets_Calibpz).at(aInt32_943))/1000.0), (((*(*this).AntiKt4TopoEMJets_CalibE).at(aInt32_943))/1000.0));
		      aNTLorentzVector_946 = &tlz138;
		      double aDouble_947=(*aNTLorentzVector_946).Pt();
		      aDictionary_2_945Map[aDouble_947].push_back(aInt32_943);
		    }
		    vector<double> aDouble___948;
		    for(map<double, vector<int> >::const_iterator i_itr = aDictionary_2_945Map.begin(); i_itr != aDictionary_2_945Map.end(); i_itr++) {
		      aDouble___948.push_back(i_itr->first);
		    }
		    sort(aDouble___948.begin(), aDouble___948.end());
		    for (int i_index = aDouble___948.size()-1; i_index >= 0; i_index--) {
		      const vector<int> &sublist0(aDictionary_2_945Map[aDouble___948.at(i_index)]);
		      for (int i_sindex = 0; i_sindex < sublist0.size(); i_sindex++) {
		        const int aInt32_949 = sublist0.at(i_sindex);
		          {
		            aInt32_950++;
		            if (aInt32_950 > 1)
		            {
		              if (!aBoolean_951) {
		                aBoolean_951 = true;
		              }
		            }
		          }
		      }
		    }
		    
		    // BUG: this should be 951. And lower down it is 951. So this is a code combination
		    // bug??
		    
		    if (aBoolean_974)
		    {
		      map<double, vector<int> > aDictionary_2_979Map;

LINQ Query

            var goodEvents = events
                .Where(EDMCuts.DefaultDataEventCuts);
            var jetPairs = from e in goodEvents
                           let alljets = e.Jets.Select(j => DataBuilder.jetMaker.Invoke(j))
                           let sorted = alljets.OrderByDescending(j => j.c.Pt())
                           where sorted.Skip(1).Any()
                           select Tuple.Create(sorted.First(), sorted.Skip(1).First());

            SetIgnoreQuery(true);
            jetPairs
                .Select(p => p.Item1)
               .FuturePlot(EDMPlotSpec.SpPtPlot, "AllFirstJets")
               .Save(output);
            SetIgnoreQuery(false);

            var jetPairs2 = from e in goodEvents
                            let alljets = e.Jets.Select(j => DataBuilder.jetMaker.Invoke(j))
                            let sorted = alljets.OrderByDescending(j => j.c.Pt())
                            where sorted.Skip(1).Any()
                            select sorted.First();

            SetIgnoreQuery(true);
            jetPairs2
               .FuturePlot(EDMPlotSpec.SpPtPlot, "AllPairFirstJets")
               .Save(output);
            SetIgnoreQuery(false);