replace std::count_if with std::ranges::count_if where appropriate

the c++-20 constrained algorithm is safer and code is more readable

opm/simulators/flow/NlddReporting.hpp

@@ -232,8 +232,9 @@ void printDomainDistributionSummary(
     const int owned_cells = partition_vector.size();
 
     // Count overlap cells using grid view iteration
-    int overlap_cells = std::count_if(elements(gridView).begin(), elements(gridView).end(),
-                                      [](const auto& cell) { return cell.partitionType() == Dune::OverlapEntity; });
+    int overlap_cells = std::ranges::count_if(elements(gridView),
+                                              [](const auto& cell)
+                                              { return cell.partitionType() == Dune::OverlapEntity; });
 
     // Store data for summary output
     local_reports_accumulated.success.num_wells = num_wells;

opm/simulators/wells/BlackoilWellModelGeneric.cpp

@@ -1795,9 +1795,9 @@ int BlackoilWellModelGeneric<Scalar, IndexTraits>::numLocalWellsEnd() const
 {
     const auto& wnames = schedule().back().well_order().names();
 
-    return std::count_if(wnames.begin(), wnames.end(),
-                         [this](const std::string& wname)
-                         { return ! this->not_on_process_(wname); });
+    return std::ranges::count_if(wnames,
+                                 [this](const std::string& wname)
+                                 { return ! this->not_on_process_(wname); });
 }
 
 template<typename Scalar, typename IndexTraits>