Allow access to wells pointer for wells.

Using &stdwells.wells() throws an assertion for null pointers
without -DNDEBUG, but was used nevertheless. That prevented running
models without wells.

opm/autodiff/BlackoilModelBase_impl.hpp

@@ -223,7 +223,7 @@ namespace detail {
 
         // TODO: put this for now to avoid modify the following code.
         // TODO: this code can be fragile.
-        const Wells* wells_arg = &(asImpl().well_model_.wells());
+        const Wells* wells_arg = asImpl().well_model_.wellsPointer();
 
 #if HAVE_MPI
         if ( linsolver_.parallelInformation().type() == typeid(ParallelISTLInformation) )

opm/autodiff/MultisegmentWells.cpp

@@ -294,6 +294,12 @@ namespace Opm {
     }
 
 
+    const Wells*
+    MultisegmentWells::wellsPointer() const
+    {
+        return wells_;
+    }
+
 
 
 

opm/autodiff/MultisegmentWells.hpp

@@ -102,6 +102,8 @@ namespace Opm {
 
             const Wells& wells() const;
 
+            const Wells* wellsPointer() const;
+
             int numPhases() const { return num_phases_; };
 
             int numWells() const { return wells_multisegment_.size(); }

opm/autodiff/StandardWells.hpp

@@ -74,6 +74,8 @@ namespace Opm {
 
             const Wells& wells() const;
 
+            const Wells* wellsPointer() const;
+
             /// return true if wells are available in the reservoir
             bool wellsActive() const;
             void setWellsActive(const bool wells_active);

opm/autodiff/StandardWells_impl.hpp

@@ -115,6 +115,10 @@ namespace Opm
     }
 
 
+    const Wells* StandardWells::wellsPointer() const
+    {
+        return wells_;
+    }