OpenFOAM: added "transfer" constructor to tmp

Needed for return of tmp argument in "absolute" meshPhi function

src/OpenFOAM/memory/tmp/tmp.H

@@ -79,6 +79,9 @@ public:
         //- Construct copy and increment reference count
         inline tmp(const tmp<T>&);
 
+        //- Construct copy transferring content of temporary if required
+        inline tmp(const tmp<T>&, bool allowTransfer);
+
 
     //- Destructor, delete object when reference count == 0
     inline ~tmp();

src/OpenFOAM/memory/tmp/tmpI.H

@@ -68,6 +68,38 @@ inline Foam::tmp<T>::tmp(const tmp<T>& t)
 }
 
 
+template<class T>
+inline Foam::tmp<T>::tmp(const tmp<T>& t, bool allowTransfer)
+:
+    isTmp_(t.isTmp_),
+    ptr_(t.ptr_),
+    ref_(t.ref_)
+{
+    if (isTmp_)
+    {
+        if (allowTransfer)
+        {
+            const_cast<tmp<T>&>(t).ptr_ = 0;
+        }
+        else
+        {
+            if (ptr_)
+            {
+                ptr_->operator++();
+            }
+            else
+            {
+                FatalErrorIn
+                (
+                    "Foam::tmp<T>::tmp(const tmp<T>&, bool allowTransfer)"
+                )   << "attempted copy of a deallocated temporary"
+                    << abort(FatalError);
+            }
+        }
+    }
+}
+
+
 template<class T>
 inline Foam::tmp<T>::~tmp()
 {

src/finiteVolume/finiteVolume/fvc/fvcMeshPhi.C

@@ -160,7 +160,7 @@ Foam::tmp<Foam::surfaceScalarField> Foam::fvc::absolute
     }
     else
     {
-        return tphi;
+        return tmp<surfaceScalarField>(tphi, true);
     }
 }
 
@@ -178,7 +178,7 @@ Foam::tmp<Foam::surfaceScalarField> Foam::fvc::absolute
     }
     else
     {
-        return tphi;
+        return tmp<surfaceScalarField>(tphi, true);
     }
 }