From 4c2ccffacf33b0629d67dec3e1b2d21316528a48 Mon Sep 17 00:00:00 2001
From: Will Bainbridge <http://cfd.direct>
Date: Thu, 27 Jan 2022 10:01:18 +0000
Subject: [PATCH] UPtrList: Added convert method to return a UPtrList of a
 different type

This is useful for creating a UPtrList<BaseType> from a
UPtrList<DerivedType>, or creating a UPtrList<const Type> from a
UPtrList<Type>.

The new pointers are constructed by implicit conversion of the old ones,
so the new type must be a base class of the old type and it must not
remove const-ness.
---
 .../containers/Lists/UPtrList/UPtrList.C      | 29 ++++++++++++++++++-
 .../containers/Lists/UPtrList/UPtrList.H      | 13 ++++++++-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
index 40967b25c9..8cf962d193 100644
--- a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
+++ b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2019 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2022 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -157,6 +157,33 @@ void Foam::UPtrList<T>::shuffle(const labelUList& newToOld)
 }
 
 
+
+template<class T>
+template<class T2>
+Foam::UPtrList<T2> Foam::UPtrList<T>::convert()
+{
+    UPtrList<T2> result(size());
+    forAll(ptrs_, i)
+    {
+        result.set(i, ptrs_[i]);
+    }
+    return result;
+}
+
+
+template<class T>
+template<class T2>
+Foam::UPtrList<const T2> Foam::UPtrList<T>::convert() const
+{
+    UPtrList<const T2> result(size());
+    forAll(ptrs_, i)
+    {
+        result.set(i, ptrs_[i]);
+    }
+    return result;
+}
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 #include "UPtrListIO.C"
diff --git a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
index b03bfdd298..0ce584ba66 100644
--- a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
+++ b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2022 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -150,6 +150,17 @@ public:
             void shuffle(const labelUList& newToOld);
 
 
+        // Conversion
+
+            //- Convert to list of different pointer type
+            template<class T2>
+            UPtrList<T2> convert();
+
+            //- Convert to list of different pointer type
+            template<class T2>
+            UPtrList<const T2> convert() const;
+
+
     // Member Operators
 
         //- Return element const reference