add comments for web documentation

src/opt/manySolutions/geneticAlgorithm/NSGA2_Algorithm.h

@@ -86,6 +86,7 @@ namespace opt::manySolutions::geneticAlgorithm {
             this->setSelection(*select);
         }
 
+        // tag::algoNSGA2[]
         /**
          * The operator that runs the nsga-ii genetic algorithm
          * @param POPULATION population
@@ -95,20 +96,20 @@ namespace opt::manySolutions::geneticAlgorithm {
             for (auto &i: sol) {
                 eval(i);
             }
-            auto fronts = NSGA2_Solution<SOL>::fastNonDominatedSort(sol);
-            for (auto &f: fronts) NSGA2_Solution<SOL>::crowdingDistanceAssignment(sol, f);
+            auto fronts = NSGA2_Solution<SOL>::fastNonDominatedSort(sol);  // <1>
+            for (auto &f: fronts) NSGA2_Solution<SOL>::crowdingDistanceAssignment(sol, f); // <2>
 
             while (this->criterion->operator()()) {
                 this->numberOfGenerations++;
-                this->selection->operator()(sol);
+                this->selection->operator()(sol); // <3>
                 this->crossover->operator()(this->selection->getSelectedPopulation());
                 this->mutation->operator()(this->crossover->getOffspring());
-                this->replacement->operator()(sol, this->mutation->getOffspring());
+                this->replacement->operator()(sol, this->mutation->getOffspring()); // <4>
                 this->criterion->update();
                 this->checkpoint->operator()(sol);
             }
         }
-
+        // end::algoNSGA2[]
     protected:
         core::Eval<NSGA2SOL> &eval;