From 2f32b586b5f61e8dfb87d450de6b40c7959a1b2b Mon Sep 17 00:00:00 2001
From: Mark Olesen <Mark.Olesen@esi-group.com>
Date: Tue, 9 Jan 2018 13:15:50 +0100
Subject: [PATCH] ENH: PtrList, UPtrList cleanup

- rationalize iterators, reduce code duplication,
  improve assignment behaviour, moveable construct and assignment.
---
 applications/test/PtrList/Test-PtrList.C      |  90 +++-
 .../containers/Lists/PtrList/PtrList.C        | 216 +++-------
 .../containers/Lists/PtrList/PtrList.H        | 105 ++---
 .../containers/Lists/PtrList/PtrListI.H       |  62 ++-
 .../containers/Lists/PtrList/PtrListIO.C      |  11 +-
 .../containers/Lists/UPtrList/UPtrList.C      | 131 ++----
 .../containers/Lists/UPtrList/UPtrList.H      | 396 ++++++++----------
 .../containers/Lists/UPtrList/UPtrListI.H     | 300 ++++++++-----
 8 files changed, 627 insertions(+), 684 deletions(-)

diff --git a/applications/test/PtrList/Test-PtrList.C b/applications/test/PtrList/Test-PtrList.C
index 851d3990fc..043cfe5c37 100644
--- a/applications/test/PtrList/Test-PtrList.C
+++ b/applications/test/PtrList/Test-PtrList.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -21,10 +21,8 @@ License
     You should have received a copy of the GNU General Public License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
-Application
-
 Description
-
+    Test behaviour of UPtrList, PtrList
 \*---------------------------------------------------------------------------*/
 
 #include "OSspecific.H"
@@ -102,13 +100,13 @@ int main(int argc, char *argv[])
 
         forAllIters(llist1, it)
         {
-            Info<< typeid(*it).name() << endl;
-            Info<< "reversed: " << *it << endl;
+            Info<< typeid(*it).name() << nl
+                << "reversed: " << *it << endl;
         }
         for (const auto& it : llist1)
         {
-            Info<< typeid(it).name() << endl;
-            Info<< "for-: " << it << endl;
+            Info<< typeid(it).name() << nl
+                << "for-: " << it << endl;
         }
     }
 
@@ -127,9 +125,10 @@ int main(int argc, char *argv[])
         listApp.append(new Scalar(1.3*i));
     }
 
-    Info<<"list1: " << list1 << endl;
-    Info<<"list2: " << list2 << endl;
-    Info<<"listApp: " << listApp << endl;
+    Info<< nl
+        <<"list1: " << list1 << nl
+        <<"list2: " << list2 << nl
+        <<"list-appended: " << listApp << endl;
 
     Info<<"indirectly delete some items via set(.., 0) :" << endl;
     for (label i = 0; i < 3; i++)
@@ -140,8 +139,8 @@ int main(int argc, char *argv[])
     Info<<"transfer list2 -> list1:" << endl;
     list1.transfer(list2);
 
-    Info<<"list1: " << list1 << endl;
-    Info<<"list2: " << list2 << endl;
+    Info<<"list1: " << list1 << nl
+        <<"list2: " << list2 << endl;
 
     Info<<"indirectly delete some items via setSize :" << endl;
     list1.setSize(4);
@@ -151,16 +150,71 @@ int main(int argc, char *argv[])
     PtrList<Scalar> list3(list1.xfer());
     Info<< "Transferred via the xfer() method" << endl;
 
-    Info<<"list1: " << list1 << endl;
-    Info<<"list2: " << list2 << endl;
-    Info<<"list3: " << list3 << endl;
+    Info<<"list1: " << list1 << nl
+        <<"list2: " << list2 << nl
+        <<"list3: " << list3 << endl;
+
+
+    Info<<"Move construct:" << endl;
+
+    PtrList<Scalar> list4(std::move(list3));
+
+    Info<<"list3: " << list3 << nl
+        <<"list4: " << list4 << endl;
+
+    Info<<"Move assign:" << endl;
+    list3 = std::move(list4);
+
+    Info<<"list3: " << list3 << nl
+        <<"list4: " << list4 << endl;
+
+
+    Info<<"UPtrList from PtrList" << nl;
+
+    UPtrList<Scalar> ulist1(list3);
+
+    Info<<"ulist1: " << ulist1 << nl;
+
+    Info<<"Move construct:" << endl;
+
+    UPtrList<Scalar> ulist2(std::move(ulist1));
+
+    Info<<"ulist1: " << ulist1 << nl
+        <<"ulist2: " << ulist2 << nl;
+
+    Info<<"Copy assign:" << endl;
+    ulist1 = ulist2;
+
+    Info<<"ulist1: " << ulist1 << nl
+        <<"ulist2: " << ulist2 << nl;
+
+    Info<<"Move assign:" << endl;
+    ulist1 = std::move(ulist2);
+
+    Info<<"ulist1: " << ulist1 << nl
+        <<"ulist2: " << ulist2 << nl;
+
+    // Test iterator random access
+    {
+        auto iter1 = ulist1.begin();
+        auto iter2 = iter1 + 3;
+
+        Info<<"begin:" << *iter1 << " (+3):" << *iter2 << nl;
+        Info<< "diff= " << (iter1 - iter2) << nl;
+        Info<< "iter[2]=" << iter1[2] << nl;
+        Info<< "iter1 < iter2 : " << (iter1 < iter2) << nl;
+        Info<< "iter1 >= iter2 : " << (iter1 >= iter2) << nl;
+    }
 
     PtrList<plane> planes;
     planes.append(new plane(vector::one, vector::one));
     planes.append(new plane(vector(1,2,3), vector::one));
 
-    forAll(planes, p)
-        Info<< "plane " << planes[p] << endl;
+    Info<< nl << "appended values" << nl;
+    for (const plane& p : planes)
+    {
+        Info<< "    plane " << p << endl;
+    }
 
     Info<< nl << "Done." << endl;
     return 0;
diff --git a/src/OpenFOAM/containers/Lists/PtrList/PtrList.C b/src/OpenFOAM/containers/Lists/PtrList/PtrList.C
index b8555da86b..fd0b7263ca 100644
--- a/src/OpenFOAM/containers/Lists/PtrList/PtrList.C
+++ b/src/OpenFOAM/containers/Lists/PtrList/PtrList.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -29,40 +29,30 @@ License
 // * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
 
 template<class T>
-Foam::PtrList<T>::PtrList()
+Foam::PtrList<T>::PtrList(const PtrList<T>& lst)
 :
-    UPtrList<T>()
-{}
-
-
-template<class T>
-Foam::PtrList<T>::PtrList(const label len)
-:
-    UPtrList<T>(len)
-{}
-
-
-template<class T>
-Foam::PtrList<T>::PtrList(const PtrList<T>& a)
-:
-    UPtrList<T>(a.size())
+    UPtrList<T>(lst.size())
 {
-    forAll(*this, i)
+    const label len = this->size();
+
+    for (label i=0; i<len; ++i)
     {
-        this->ptrs_[i] = (a[i]).clone().ptr();
+        this->ptrs_[i] = (lst[i]).clone().ptr();
     }
 }
 
 
 template<class T>
 template<class CloneArg>
-Foam::PtrList<T>::PtrList(const PtrList<T>& a, const CloneArg& cloneArg)
+Foam::PtrList<T>::PtrList(const PtrList<T>& lst, const CloneArg& cloneArg)
 :
-    UPtrList<T>(a.size())
+    UPtrList<T>(lst.size())
 {
-    forAll(*this, i)
+    const label len = this->size();
+
+    for (label i=0; i<len; ++i)
     {
-        this->ptrs_[i] = (a[i]).clone(cloneArg).ptr();
+        this->ptrs_[i] = (lst[i]).clone(cloneArg).ptr();
     }
 }
 
@@ -75,34 +65,31 @@ Foam::PtrList<T>::PtrList(const Xfer<PtrList<T>>& lst)
 
 
 template<class T>
-Foam::PtrList<T>::PtrList(PtrList<T>& a, bool reuse)
+Foam::PtrList<T>::PtrList(PtrList<T>& lst, bool reuse)
 :
-    UPtrList<T>(a, reuse)
+    UPtrList<T>(lst, reuse)
 {
     if (!reuse)
     {
-        forAll(*this, i)
+        const label len = this->size();
+
+        for (label i=0; i<len; ++i)
         {
-            this->ptrs_[i] = (a[i]).clone().ptr();
+            this->ptrs_[i] = (lst[i]).clone().ptr();
         }
     }
 }
 
 
 template<class T>
-Foam::PtrList<T>::PtrList(const SLPtrList<T>& sll)
+Foam::PtrList<T>::PtrList(const SLPtrList<T>& lst)
 :
-    UPtrList<T>(sll.size())
+    UPtrList<T>(lst.size())
 {
-    if (sll.size())
+    if (lst.size())
     {
         label i = 0;
-        for
-        (
-            typename SLPtrList<T>::const_iterator iter = sll.cbegin();
-            iter != sll.cend();
-            ++iter
-        )
+        for (auto iter = lst.cbegin(); iter != lst.cend(); ++iter)
         {
             this->ptrs_[i++] = (*iter).clone().ptr();
         }
@@ -115,7 +102,10 @@ Foam::PtrList<T>::PtrList(const SLPtrList<T>& sll)
 template<class T>
 Foam::PtrList<T>::~PtrList()
 {
-    forAll(*this, i)
+    const label len = this->size();
+
+    // Free old pointers
+    for (label i=0; i<len; ++i)
     {
         if (this->ptrs_[i])
         {
@@ -127,53 +117,12 @@ Foam::PtrList<T>::~PtrList()
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-template<class T>
-void Foam::PtrList<T>::setSize(const label newSize)
-{
-    if (newSize < 0)
-    {
-        FatalErrorInFunction
-            << "bad set size " << newSize
-            << " for type " << typeid(T).name()
-            << abort(FatalError);
-    }
-
-    label oldSize = this->size();
-
-    if (newSize == 0)
-    {
-        clear();
-    }
-    else if (newSize < oldSize)
-    {
-        label i;
-        for (i=newSize; i<oldSize; i++)
-        {
-            if (this->ptrs_[i])
-            {
-                delete this->ptrs_[i];
-            }
-        }
-
-        this->ptrs_.setSize(newSize);
-    }
-    else // newSize > oldSize
-    {
-        this->ptrs_.setSize(newSize);
-
-        label i;
-        for (i=oldSize; i<newSize; i++)
-        {
-            this->ptrs_[i] = nullptr;
-        }
-    }
-}
-
-
 template<class T>
 void Foam::PtrList<T>::clear()
 {
-    forAll(*this, i)
+    const label len = this->size();
+
+    for (label i=0; i<len; ++i)
     {
         if (this->ptrs_[i])
         {
@@ -181,109 +130,82 @@ void Foam::PtrList<T>::clear()
         }
     }
 
-    this->ptrs_.clear();
+    UPtrList<T>::clear();
 }
 
 
 template<class T>
-void Foam::PtrList<T>::transfer(PtrList<T>& a)
+void Foam::PtrList<T>::setSize(const label newLen)
 {
-    clear();
-    this->ptrs_.transfer(a.ptrs_);
-}
-
-
-template<class T>
-void Foam::PtrList<T>::reorder(const labelUList& oldToNew)
-{
-    if (oldToNew.size() != this->size())
+    if (newLen <= 0)
     {
-        FatalErrorInFunction
-            << "Size of map (" << oldToNew.size()
-            << ") not equal to list size (" << this->size()
-            << ") for type " << typeid(T).name()
-            << abort(FatalError);
+        clear();
+        return;
     }
 
-    List<T*> newPtrs_(this->ptrs_.size(), reinterpret_cast<T*>(0));
-
-    forAll(*this, i)
+    const label oldLen = this->size();
+    if (newLen < oldLen)
     {
-        const label newI = oldToNew[i];
-
-        if (newI < 0 || newI >= this->size())
+        // Truncate - free old pointers
+        for (label i=newLen; i<oldLen; ++i)
         {
-            FatalErrorInFunction
-                << "Illegal index " << newI << nl
-                << "Valid indices are 0.." << this->size()-1
-                << " for type " << typeid(T).name()
-                << abort(FatalError);
+            if (this->ptrs_[i])
+            {
+                delete this->ptrs_[i];
+            }
         }
 
-        if (newPtrs_[newI])
-        {
-            FatalErrorInFunction
-                << "reorder map is not unique; element " << newI
-                << " already set for type " << typeid(T).name()
-                << abort(FatalError);
-        }
-        newPtrs_[newI] = this->ptrs_[i];
+        this->ptrs_.setSize(newLen);
     }
-
-    forAll(newPtrs_, i)
+    else if (newLen > oldLen)
     {
-        if (!newPtrs_[i])
-        {
-            FatalErrorInFunction
-                << "Element " << i << " not set after reordering with type "
-                << typeid(T).name() << nl << abort(FatalError);
-        }
+        // Extend - new elements initialized to nullptr
+        this->ptrs_.setSize(newLen, reinterpret_cast<T*>(0));
     }
-
-    this->ptrs_.transfer(newPtrs_);
 }
 
 
 // * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
 template<class T>
-void Foam::PtrList<T>::operator=(const PtrList<T>& a)
+void Foam::PtrList<T>::operator=(const PtrList<T>& lst)
 {
-    if (this == &a)
+    if (this == &lst)
     {
         FatalErrorInFunction
             << "attempted assignment to self for type " << typeid(T).name()
             << abort(FatalError);
     }
 
-    if (this->size() == 0)
-    {
-        setSize(a.size());
+    const label oldLen = this->size();
+    const label newLen = lst.size();
 
-        forAll(*this, i)
-        {
-            this->ptrs_[i] = (a[i]).clone().ptr();
-        }
-    }
-    else if (a.size() == this->size())
+    // Truncate (frees old pointers) or extend the length
+    setSize(newLen);
+
+    if (newLen < oldLen)
     {
-        forAll(*this, i)
+        // Copy values for existing entries
+        for (label i=0; i<newLen; ++i)
         {
-            (*this)[i] = a[i];
+            (*this)[i] = lst[i];
         }
     }
     else
     {
-        FatalErrorInFunction
-            << "bad size: " << a.size()
-            << " for type " << typeid(T).name()
-            << abort(FatalError);
+        // Copy values for existing entries
+        for (label i=0; i<oldLen; ++i)
+        {
+            (*this)[i] = lst[i];
+        }
+
+        // Clone pointers for new entries
+        for (label i=oldLen; i<newLen; ++i)
+        {
+            this->ptrs_[i] = (lst[i]).clone().ptr();
+        }
     }
 }
 
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-#include "PtrListIO.C"
-
 // ************************************************************************* //
diff --git a/src/OpenFOAM/containers/Lists/PtrList/PtrList.H b/src/OpenFOAM/containers/Lists/PtrList/PtrList.H
index 1b81e189e3..c49f70846b 100644
--- a/src/OpenFOAM/containers/Lists/PtrList/PtrList.H
+++ b/src/OpenFOAM/containers/Lists/PtrList/PtrList.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -25,11 +25,12 @@ Class
     Foam::PtrList
 
 Description
-    A templated 1D list of pointers to objects of type \<T\>, where the
-    size of the array is known and used for subscript bounds checking, etc.
+    A list of pointers to objects of type \<T\>, with allocation/deallocation
+    management of the pointers.
+    The operator[] returns a reference to the object, not the pointer.
 
-    The element operator [] returns a reference to the object rather than a
-    pointer.
+See Also
+    Foam::PtrList
 
 SourceFiles
     PtrListI.H
@@ -81,27 +82,30 @@ public:
 
     // Constructors
 
-        //- Null Constructor
-        PtrList();
+        //- Construct null
+        PtrList() = default;
 
-        //- Construct with size specified
-        explicit PtrList(const label len);
+        //- Construct with specified size, each element initialized to nullptr
+        explicit inline PtrList(const label nElem);
 
-        //- Copy constructor, using 'clone()' method on each element
-        PtrList(const PtrList<T>& a);
+        //- Copy construct using 'clone()' method on each element
+        PtrList(const PtrList<T>& lst);
 
-        //- Copy constructor with additional argument for clone
+        //- Move construct
+        inline PtrList(PtrList<T>&& lst);
+
+        //- Copy construct with additional argument for 'clone()'
         template<class CloneArg>
-        PtrList(const PtrList<T>& a, const CloneArg& cloneArg);
+        PtrList(const PtrList<T>& lst, const CloneArg& cloneArg);
 
         //- Construct by transferring the parameter contents
         PtrList(const Xfer<PtrList<T>>& lst);
 
         //- Construct as copy or re-use as specified
-        PtrList(PtrList<T>& a, bool reuse);
+        PtrList(PtrList<T>& lst, bool reuse);
 
         //- Construct as copy of SLPtrList<T>
-        explicit PtrList(const SLPtrList<T>& sll);
+        explicit PtrList(const SLPtrList<T>& lst);
 
         //- Construct from Istream using given Istream constructor class
         template<class INew>
@@ -115,62 +119,62 @@ public:
     ~PtrList();
 
 
-    // Member functions
+    // Member Functions
 
-        // Edit
+        //- Clear the PtrList. Set size to zero and delete allocated entries
+        void clear();
 
-            //- Reset size of PtrList. If extending the PtrList, new entries are
-            //  set to nullptr. If truncating the PtrList, removed entries are
-            //  deleted
-            void setSize(const label);
+        //- Reset size of PtrList.
+        //  New entries are initialized to nullptr, removed entries are deleted
+        void setSize(const label newLen);
 
-            //- Alias for setSize(const label)
-            inline void resize(const label);
+        //- Reset size of PtrList.
+        //  New entries are initialized to nullptr, removed entries are deleted
+        inline void resize(const label newLen);
 
-            //- Clear the PtrList, i.e. set size to zero deleting all the
-            //  allocated entries
-            void clear();
+        //- Append an element at the end of the list
+        using UPtrList<T>::append;
 
-            //- Append an element at the end of the list
-            inline void append(T*);
-            inline void append(const autoPtr<T>&);
-            inline void append(const tmp<T>&);
+        //- Append an element at the end of the list
+        inline void append(const autoPtr<T>& aptr);
 
-            //- Transfer the contents of the argument PtrList into this PtrList
-            //  and annul the argument list
-            void transfer(PtrList<T>&);
+        //- Append an element at the end of the list
+        inline void append(const tmp<T>& tptr);
 
-            //- Transfer contents to the Xfer container
-            inline Xfer<PtrList<T>> xfer();
+        //- Transfer into this list and annul the argument list
+        inline void transfer(PtrList<T>& lst);
 
-            //- Is element set
-            inline bool set(const label) const;
+        //- Transfer contents to the Xfer container
+        inline Xfer<PtrList<T>> xfer();
 
-            //- Set element to given T* and return old element (can be nullptr)
-            inline autoPtr<T> set(const label, T*);
+        //- Return true if element is set (ie, not a nullptr)
+        inline bool set(const label i) const;
 
-            //- Set element to given autoPtr<T> and return old element
-            inline autoPtr<T> set(const label, const autoPtr<T>&);
+        //- Set element to given pointer and return old element (can be null)
+        inline autoPtr<T> set(const label i, T* ptr);
 
-            //- Set element to given tmp<T> and return old element
-            inline autoPtr<T> set(const label, const tmp<T>&);
+        //- Set element to given autoPtr and return old element
+        inline autoPtr<T> set(const label i, const autoPtr<T>& aptr);
 
-            //- Reorders elements. Ordering does not have to be done in
-            //  ascending or descending order. Reordering has to be unique.
-            //  (is shuffle)
-            void reorder(const labelUList&);
+        //- Set element to given tmp and return old element
+        inline autoPtr<T> set(const label i, const tmp<T>& tptr);
 
 
     // Member operators
 
-        //- Assignment
-        void operator=(const PtrList<T>&);
+        //- Copy assignment.
+        //  For existing list entries, values are copied from the list.
+        //  For new list entries, pointers are cloned from the list.
+        void operator=(const PtrList<T>& lst);
+
+        //- Move assignment
+        inline void operator=(PtrList<T>&& lst);
 
 
     // IOstream operator
 
         //- Read PtrList from Istream, discarding contents of existing PtrList
-        friend Istream& operator>> <T>(Istream&, PtrList<T>&);
+        friend Istream& operator>> <T>(Istream& is, PtrList<T>& lst);
 };
 
 
@@ -186,6 +190,7 @@ public:
 
 #ifdef NoRepository
     #include "PtrList.C"
+    #include "PtrListIO.C"
 #endif
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/OpenFOAM/containers/Lists/PtrList/PtrListI.H b/src/OpenFOAM/containers/Lists/PtrList/PtrListI.H
index ee1a0579fa..50885d572e 100644
--- a/src/OpenFOAM/containers/Lists/PtrList/PtrListI.H
+++ b/src/OpenFOAM/containers/Lists/PtrList/PtrListI.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -26,38 +26,42 @@ License
 #include "autoPtr.H"
 #include "tmp.H"
 
+// * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
+
+template<class T>
+inline Foam::PtrList<T>::PtrList(const label nElem)
+:
+    UPtrList<T>(nElem)
+{}
+
+
+template<class T>
+inline Foam::PtrList<T>::PtrList(PtrList<T>&& lst)
+:
+    UPtrList<T>(std::move(lst))
+{}
+
+
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 template<class T>
-inline void Foam::PtrList<T>::resize(const label newSize)
+inline void Foam::PtrList<T>::resize(const label newLen)
 {
-    this->setSize(newSize);
-}
-
-
-template<class T>
-inline void Foam::PtrList<T>::append(T* ptr)
-{
-    const label idx = this->size();
-    this->setSize(idx + 1);
-    this->ptrs_[idx] = ptr;
+    this->setSize(newLen);
 }
 
 
 template<class T>
 inline void Foam::PtrList<T>::append(const autoPtr<T>& aptr)
 {
-    return append(const_cast<autoPtr<T>&>(aptr).ptr());
+    return UPtrList<T>::append(const_cast<autoPtr<T>&>(aptr).ptr());
 }
 
 
 template<class T>
-inline void Foam::PtrList<T>::append
-(
-    const tmp<T>& t
-)
+inline void Foam::PtrList<T>::append(const tmp<T>& tptr)
 {
-    return append(const_cast<tmp<T>&>(t).ptr());
+    return UPtrList<T>::append(const_cast<tmp<T>&>(tptr).ptr());
 }
 
 
@@ -92,10 +96,18 @@ template<class T>
 inline Foam::autoPtr<T> Foam::PtrList<T>::set
 (
     const label i,
-    const tmp<T>& t
+    const tmp<T>& tptr
 )
 {
-    return set(i, const_cast<tmp<T>&>(t).ptr());
+    return set(i, const_cast<tmp<T>&>(tptr).ptr());
+}
+
+
+template<class T>
+inline void Foam::PtrList<T>::transfer(PtrList<T>& lst)
+{
+    this->clear();
+    UPtrList<T>::swap(lst);
 }
 
 
@@ -106,4 +118,14 @@ inline Foam::Xfer<Foam::PtrList<T>> Foam::PtrList<T>::xfer()
 }
 
 
+// * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
+
+template<class T>
+inline void Foam::PtrList<T>::operator=(PtrList<T>&& lst)
+{
+    this->clear();
+    this->swap(lst);
+}
+
+
 // ************************************************************************* //
diff --git a/src/OpenFOAM/containers/Lists/PtrList/PtrListIO.C b/src/OpenFOAM/containers/Lists/PtrList/PtrListIO.C
index 388e7ca739..141225f776 100644
--- a/src/OpenFOAM/containers/Lists/PtrList/PtrListIO.C
+++ b/src/OpenFOAM/containers/Lists/PtrList/PtrListIO.C
@@ -139,16 +139,11 @@ void Foam::PtrList<T>::read(Istream& is, const INew& inew)
 
         setSize(sllPtrs.size());
 
-        // Pointers - can simply copy
+        // A list of pointers - can simply copy
         label i = 0;
-        for
-        (
-            typename SLList<T*>::const_iterator iter = sllPtrs.cbegin();
-            iter != sllPtrs.cend();
-            ++iter
-        )
+        for (T* ptr : sllPtrs)
         {
-            set(i++, *iter);
+            set(i++, ptr);
         }
 
         return;
diff --git a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
index 69737b210e..317cf817d7 100644
--- a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
+++ b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2015-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -27,137 +27,66 @@ License
 
 // * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
 
-template<class T>
-Foam::UPtrList<T>::UPtrList()
-:
-    ptrs_()
-{}
-
-
-template<class T>
-Foam::UPtrList<T>::UPtrList(const label s)
-:
-    ptrs_(s, reinterpret_cast<T*>(0))
-{}
-
-
 template<class T>
 Foam::UPtrList<T>::UPtrList(UList<T>& lst)
 :
     ptrs_(lst.size())
 {
-    forAll(lst, i)
+    const label len = lst.size();
+
+    for (label i=0; i<len; ++i)
     {
-        ptrs_[i] = &lst[i];
+        ptrs_[i] = &(lst[i]);
     }
 }
 
 
-template<class T>
-Foam::UPtrList<T>::UPtrList(PtrList<T>& lst)
-:
-    ptrs_(lst.size())
-{
-    forAll(lst, i)
-    {
-        ptrs_[i] = &lst[i];
-    }
-}
-
-
-template<class T>
-Foam::UPtrList<T>::UPtrList(const Xfer<UPtrList<T>>& lst)
-{
-    transfer(lst());
-}
-
-
-template<class T>
-Foam::UPtrList<T>::UPtrList(UPtrList<T>& a, bool reuse)
-:
-    ptrs_(a.ptrs_, reuse)
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-template<class T>
-void Foam::UPtrList<T>::setSize(const label newSize)
-{
-    label oldSize = size();
-
-    if (newSize <= 0)
-    {
-        clear();
-    }
-    else if (newSize < oldSize)
-    {
-        ptrs_.setSize(newSize);
-    }
-    else if (newSize > oldSize)
-    {
-        ptrs_.setSize(newSize);
-
-        // set new elements to nullptr
-        for (label i=oldSize; i<newSize; i++)
-        {
-            ptrs_[i] = nullptr;
-        }
-    }
-}
-
-
-template<class T>
-void Foam::UPtrList<T>::clear()
-{
-    ptrs_.clear();
-}
-
-
-template<class T>
-void Foam::UPtrList<T>::transfer(UPtrList<T>& a)
-{
-    ptrs_.transfer(a.ptrs_);
-}
-
-
 template<class T>
 void Foam::UPtrList<T>::reorder(const labelUList& oldToNew)
 {
-    if (oldToNew.size() != size())
+    const label len = this->size();
+
+    if (oldToNew.size() != len)
     {
         FatalErrorInFunction
             << "Size of map (" << oldToNew.size()
-            << ") not equal to list size (" << size()
-            << ")." << abort(FatalError);
+            << ") not equal to list size (" << len
+            << ") for type " << typeid(T).name() << nl
+            << abort(FatalError);
     }
 
-    List<T*> newPtrs_(ptrs_.size(), reinterpret_cast<T*>(0));
+    // New list of pointers
+    List<T*> ptrLst(len, reinterpret_cast<T*>(0));
 
-    forAll(*this, i)
+    for (label i=0; i<len; ++i)
     {
-        label newI = oldToNew[i];
+        const label idx = oldToNew[i];
 
-        if (newI < 0 || newI >= size())
+        if (idx < 0 || idx >= len)
         {
             FatalErrorInFunction
-                << "Illegal index " << newI << nl
-                << "Valid indices are 0.." << size()-1
+                << "Illegal index " << idx << nl
+                << "Valid indices are 0.." << len-1
+                << " for type " << typeid(T).name() << nl
                 << abort(FatalError);
         }
 
-        if (newPtrs_[newI])
+        if (ptrLst[idx])
         {
             FatalErrorInFunction
-                << "reorder map is not unique; element " << newI
-                << " already set." << abort(FatalError);
+                << "reorder map is not unique; element " << idx
+                << " already set for type " << typeid(T).name()
+                << abort(FatalError);
         }
-        newPtrs_[newI] = ptrs_[i];
+        ptrLst[idx] = ptrs_[i];
     }
 
-    forAll(newPtrs_, i)
+    // Verify that all pointers were set
+    for (label i=0; i<len; ++i)
     {
-        if (!newPtrs_[i])
+        if (!ptrLst[i])
         {
             FatalErrorInFunction
                 << "Element " << i << " not set after reordering." << nl
@@ -165,12 +94,8 @@ void Foam::UPtrList<T>::reorder(const labelUList& oldToNew)
         }
     }
 
-    ptrs_.transfer(newPtrs_);
+    ptrs_.swap(ptrLst);
 }
 
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-#include "UPtrListIO.C"
-
 // ************************************************************************* //
diff --git a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
index 74e5d316ee..b23c6dbe1d 100644
--- a/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
+++ b/src/OpenFOAM/containers/Lists/UPtrList/UPtrList.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -25,14 +25,15 @@ Class
     Foam::UPtrList
 
 Description
-    A templated 1D list of pointers to objects of type \<T\>, where the
-    size of the array is known and used for subscript bounds checking, etc.
+    A list of pointers to objects of type \<T\>, without allocation/deallocation
+    management of the pointers - this is to be done elsewhere.
+    The operator[] returns a reference to the object, not the pointer.
 
-    The element operator [] returns a reference to the object rather than a
-    pointer.  Storage is not allocated during construction or use but is
-    supplied to the constructor as an argument.
+See Also
+    Foam::PtrList
 
 SourceFiles
+    UPtrListI.H
     UPtrList.C
     UPtrListIO.C
 
@@ -43,337 +44,271 @@ SourceFiles
 
 #include "List.H"
 #include "PtrList.H"
+#include <iterator>
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 namespace Foam
 {
 
-// Forward declaration of friend classes
-template<class T> class PtrList;
+// Forward declarations
 
-// Forward declaration of friend functions and operators
+template<class T> class PtrList;
 template<class T> class UPtrList;
 
-template<class T>
-inline typename UPtrList<T>::iterator operator+
-(
-    const typename UPtrList<T>::iterator&,
-    label
-);
-
-template<class T>
-inline typename UPtrList<T>::iterator operator+
-(
-    label,
-    const typename UPtrList<T>::iterator&
-);
-
-template<class T>
-inline typename UPtrList<T>::iterator operator-
-(
-    const typename UPtrList<T>::iterator&,
-    label
-);
-
-template<class T>
-inline label operator-
-(
-    const typename UPtrList<T>::iterator&,
-    const typename UPtrList<T>::iterator&
-);
-
-template<class T>
-inline typename UPtrList<T>::const_iterator operator+
-(
-    const typename UPtrList<T>::const_iterator&,
-    label
-);
-
-template<class T>
-inline typename UPtrList<T>::const_iterator operator+
-(
-    label,
-    const typename UPtrList<T>::const_iterator&
-);
-
-template<class T>
-inline typename UPtrList<T>::const_iterator operator-
-(
-    const typename UPtrList<T>::const_iterator&,
-    label
-);
-
-template<class T>
-inline label operator-
-(
-    const typename UPtrList<T>::const_iterator&,
-    const typename UPtrList<T>::const_iterator&
-);
-
-template<class T>
-Istream& operator>>(Istream&, UPtrList<T>&);
-
-template<class T>
-Ostream& operator<<(Ostream&, const UPtrList<T>&);
+template<class T> Ostream& operator<<(Ostream& os, const UPtrList<T>& lst);
 
 
 /*---------------------------------------------------------------------------*\
-                           Class UPtrList Declaration
+                          Class UPtrList Declaration
 \*---------------------------------------------------------------------------*/
 
 template<class T>
 class UPtrList
 {
-    // Private data
+protected:
+
+    // Protected data
 
         List<T*> ptrs_;
 
 
 public:
 
-    // Related types
+    // STL type definitions
 
-        //- Declare friendship with the UPtrList class
-        friend class PtrList<T>;
+        //- Type of values the list contains
+        typedef T value_type;
+
+        //- A non-const reference to the value_type
+        typedef T& reference;
+
+        //- A const reference to the value_type
+        typedef const T& const_reference;
+
+        //- Random-access iterator with non-const access
+        class iterator;
+
+        //- Random-access iterator with const access
+        class const_iterator;
 
 
     // Constructors
 
-        //- Null Constructor
-        UPtrList();
+        //- Construct null
+        UPtrList() = default;
 
-        //- Construct with size specified
-        explicit UPtrList(const label);
+        //- Construct with specified size, each element initialized to nullptr
+        explicit inline UPtrList(const label nElem);
 
-        //- Construct from UList
-        explicit UPtrList(UList<T>&);
+        //- Construct from PtrList, copying addresses of each list element.
+        //  The argument is non-const access since this UPtrList can be used
+        //  to change its values.
+        explicit inline UPtrList(PtrList<T>& lst);
 
-        //- Construct from PtrList
-        explicit UPtrList(PtrList<T>&);
+        //- Construct from UList, taking addresses of each list element
+        explicit UPtrList(UList<T>& lst);
 
         //- Construct by transferring the parameter contents
-        UPtrList(const Xfer<UPtrList<T>>&);
+        inline UPtrList(const Xfer<UPtrList<T>>& lst);
 
         //- Construct as copy or re-use as specified
-        UPtrList(UPtrList<T>&, bool reuse);
+        inline UPtrList(UPtrList<T>& lst, bool reuse);
+
+        //- Copy construct
+        inline UPtrList(const UPtrList<T>& lst) = default;
+
+        //- Move construct
+        inline UPtrList(UPtrList<T>&& lst);
 
 
     // Member functions
 
-        // Access
+    // Access
 
-            //- Return the number of elements in the UPtrList
-            inline label size() const;
+        //- Return the number of elements in the UPtrList
+        inline label size() const;
 
-            //- Return true if the UPtrList is empty (ie, size() is zero)
-            inline bool empty() const;
+        //- Return true if the UPtrList is empty (ie, size() is zero)
+        inline bool empty() const;
 
-            //- Swap content with another UPtrList
-            inline void swap(UPtrList<T>& lst);
+        //- Return reference to the first element of the list
+        inline T& first();
 
-            //- Return reference to the first element of the list
-            inline T& first();
+        //- Return reference to first element of the list
+        inline const T& first() const;
 
-            //- Return reference to first element of the list
-            inline const T& first() const;
+        //- Return reference to the last element of the list
+        inline T& last();
 
-            //- Return reference to the last element of the list
-            inline T& last();
-
-            //- Return reference to the last element of the list
-            inline const T& last() const;
+        //- Return reference to the last element of the list
+        inline const T& last() const;
 
 
-        // Edit
+    // Edit
 
-            //- Reset size of UPtrList.  This can only be used to set the size
-            //  of an empty UPtrList, extend a UPtrList, remove entries from
-            //  the end of a UPtrList
-            void setSize(const label);
+        //- Set list size to zero.
+        inline void clear();
 
-            //- Reset size of UPtrList.  This can only be used to set the size
-            //  of an empty UPtrList, extend a UPtrList, remove entries from
-            //  the end of a UPtrList
-            inline void resize(const label);
+        //- Reset size of UPtrList.
+        //  New entries are initialized to nullptr.
+        inline void setSize(const label newLen);
 
-            //- Clear the UPtrList, i.e. set size to zero
-            void clear();
+        //- Reset size of UPtrList.
+        //  New entries are initialized to nullptr.
+        inline void resize(const label newLen);
 
-            //- Transfer the contents of the argument UPtrList into this
-            //  UPtrList and annul the argument list
-            void transfer(UPtrList<T>&);
+        //- Append an element to the end of the list
+        inline void append(T* ptr);
 
-            //- Transfer contents to the Xfer container
-            inline Xfer<UPtrList<T>> xfer();
+        //- Swap content
+        inline void swap(UPtrList<T>& lst);
 
-            //- Is element set
-            inline bool set(const label) const;
+        //- Transfer contents into this list and annul the argument
+        inline void transfer(UPtrList<T>& lst);
 
-            //- Set element. Return old element (can be nullptr).
-            //  No checks on new element
-            inline T* set(const label, T*);
+        //- Transfer contents to the Xfer container
+        inline Xfer<UPtrList<T>> xfer();
 
-            //- Reorders elements. Ordering does not have to be done in
-            //  ascending or descending order. Reordering has to be unique.
-            //  (is shuffle)
-            void reorder(const labelUList&);
+        //- Return true if element is set (ie, not a nullptr)
+        inline bool set(const label i) const;
+
+        //- Set element to given pointer and return old element (can be null).
+        //  No checks on new element
+        inline T* set(const label i, T* ptr);
+
+        //- Reorder elements. Reordering must be unique (ie, shuffle).
+        void reorder(const labelUList& oldToNew);
 
 
     // Member operators
 
         //- Return element const reference
-        inline const T& operator[](const label) const;
+        inline const T& operator[](const label i) const;
 
         //- Return element reference
-        inline T& operator[](const label);
+        inline T& operator[](const label i);
 
         //- Return element const pointer
-        inline const T* operator()(const label) const;
+        inline const T* operator()(const label i) const;
+
+        //- Copy assignment
+        UPtrList<T>& operator=(const UPtrList<T>& lst) = default;
+
+        //- Move assignment
+        inline void operator=(UPtrList<T>&& lst);
 
 
-    // STL type definitions
+    // Iterators
 
-        //- Type of values the UPtrList contains
-        typedef T value_type;
-
-        //- Type that can be used for storing into UPtrList::value_type objects
-        typedef T& reference;
-
-        //- Type that can be used for storing into constant UPtrList::value_type
-        //  objects
-        typedef const T& const_reference;
-
-
-    // STL iterator
-    // Random access iterator for traversing UPtrList
-
-        class iterator;
-        friend class iterator;
-
-        //- An STL iterator
+        //- Random-access iterator with non-const access
         class iterator
         {
             T** ptr_;
 
         public:
 
-            //- Construct for a given UPtrList entry
-            inline iterator(T**);
+            using iterator_category = std::random_access_iterator_tag;
+            using value_type = T;
+            using difference_type = label;
+            using pointer = T*;
+            using reference = T&;
+            friend class const_iterator;
+
+            //- Construct for a given entry
+            inline iterator(T** ptr);
 
             // Member operators
 
-                inline bool operator==(const iterator&) const;
-                inline bool operator!=(const iterator&) const;
+            inline bool operator==(const iterator& iter) const;
+            inline bool operator!=(const iterator& iter) const;
 
-                inline T& operator*();
-                inline T& operator()();
+            inline reference operator*() const;
+            inline reference operator()() const;
 
-                inline iterator operator++();
-                inline iterator operator++(int);
+            // Forward iteration
+            inline iterator& operator++();
+            inline iterator operator++(int);
 
-                inline iterator operator--();
-                inline iterator operator--(int);
+            inline iterator& operator--();
+            inline iterator operator--(int);
 
-                inline iterator operator+=(label);
+            // Random-access
+            inline iterator& operator+=(difference_type n);
+            inline iterator& operator-=(difference_type n);
+            inline iterator operator+(difference_type n) const;
+            inline iterator operator-(difference_type n) const;
 
-                friend iterator operator+ <T>(const iterator&, label);
-                friend iterator operator+ <T>(label, const iterator&);
+            inline difference_type operator-(const iterator& iter) const;
 
-                inline iterator operator-=(label);
+            inline reference operator[](difference_type n) const;
 
-                friend iterator operator- <T>(const iterator&, label);
+            inline bool operator<(const iterator& iter) const;
+            inline bool operator>(const iterator& iter) const;
 
-                friend label operator- <T>
-                (
-                    const iterator&,
-                    const iterator&
-                );
-
-                inline T& operator[](label);
-
-                inline bool operator<(const iterator&) const;
-                inline bool operator>(const iterator&) const;
-
-                inline bool operator<=(const iterator&) const;
-                inline bool operator>=(const iterator&) const;
+            inline bool operator<=(const iterator& iter) const;
+            inline bool operator>=(const iterator& iter) const;
         };
 
-        //- Return an iterator to begin traversing the UPtrList
-        inline iterator begin();
 
-        //- Return an iterator to end traversing the UPtrList
-        inline iterator end();
-
-
-    // STL const_iterator
-    // Random access iterator for traversing UPtrList
-
-        //- An STL-conforming const_iterator
+        //- Random-access iterator with const access
         class const_iterator
         {
             const T* const* ptr_;
 
         public:
 
-            //- Construct for a given UPtrList entry
-            inline const_iterator(const T* const*);
+            using iterator_category = std::random_access_iterator_tag;
+            using value_type = const T;
+            using difference_type = label;
+            using pointer = const T*;
+            using reference = const T&;
 
-            //- Construct from an iterator
-            inline const_iterator(const iterator&);
+            //- Construct for a given entry
+            inline const_iterator(const T* const* ptr);
 
+            //- Copy construct from non-const iterator
+            inline const_iterator(const iterator& iter);
 
             // Member operators
 
-                inline bool operator==(const const_iterator&) const;
-                inline bool operator!=(const const_iterator&) const;
+            inline bool operator==(const const_iterator& iter) const;
+            inline bool operator!=(const const_iterator& iter) const;
 
-                typedef const T& Tref;
-                inline Tref operator*();
-                inline Tref operator()();
+            inline reference operator*() const;
+            inline reference operator()() const;
 
-                inline const_iterator operator++();
-                inline const_iterator operator++(int);
+            // Forward iteration
+            inline const_iterator& operator++();
+            inline const_iterator operator++(int);
 
-                inline const_iterator operator--();
-                inline const_iterator operator--(int);
+            inline const_iterator& operator--();
+            inline const_iterator operator--(int);
 
-                inline const_iterator operator+=(label);
+            // Random-access
+            inline const_iterator& operator+=(difference_type n);
+            inline const_iterator& operator-=(difference_type n);
+            inline const_iterator operator+(difference_type n) const;
+            inline const_iterator operator-(difference_type n) const;
 
-                friend const_iterator operator+ <T>
-                (
-                    const const_iterator&,
-                    label
-                );
-                friend const_iterator operator+ <T>
-                (
-                    label,
-                    const const_iterator&
-                );
+            inline difference_type operator-(const const_iterator& iter) const;
 
-                inline const_iterator operator-=(label);
+            inline reference operator[](difference_type n) const;
 
-                friend const_iterator operator- <T>
-                (
-                    const const_iterator&,
-                    label
-                );
+            inline bool operator<(const const_iterator& iter) const;
+            inline bool operator>(const const_iterator& iter) const;
 
-                friend label operator- <T>
-                (
-                    const const_iterator&,
-                    const const_iterator&
-                );
-
-                inline const T& operator[](label);
-
-                inline bool operator<(const const_iterator&) const;
-                inline bool operator>(const const_iterator&) const;
-
-                inline bool operator<=(const const_iterator&) const;
-                inline bool operator>=(const const_iterator&) const;
+            inline bool operator<=(const const_iterator& iter) const;
+            inline bool operator>=(const const_iterator& iter) const;
         };
 
+
+        //- Return an iterator to begin traversing the UPtrList
+        inline iterator begin();
+
+        //- Return an iterator to end traversing the UPtrList
+        inline iterator end();
+
         //- Return an const_iterator to begin traversing the UPtrList
         inline const_iterator cbegin() const;
 
@@ -390,7 +325,7 @@ public:
     // IOstream operator
 
         //- Write UPtrList to Ostream
-        friend Ostream& operator<< <T>(Ostream&, const UPtrList<T>&);
+        friend Ostream& operator<< <T>(Ostream& os, const UPtrList<T>& lst);
 };
 
 
@@ -406,6 +341,7 @@ public:
 
 #ifdef NoRepository
     #include "UPtrList.C"
+    #include "UPtrListIO.C"
 #endif
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/OpenFOAM/containers/Lists/UPtrList/UPtrListI.H b/src/OpenFOAM/containers/Lists/UPtrList/UPtrListI.H
index 29f7592aa0..8ad86a3604 100644
--- a/src/OpenFOAM/containers/Lists/UPtrList/UPtrListI.H
+++ b/src/OpenFOAM/containers/Lists/UPtrList/UPtrListI.H
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -23,6 +23,43 @@ License
 
 \*---------------------------------------------------------------------------*/
 
+// * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
+
+template<class T>
+inline Foam::UPtrList<T>::UPtrList(const label nElem)
+:
+    ptrs_(nElem, reinterpret_cast<T*>(0))
+{}
+
+
+template<class T>
+inline Foam::UPtrList<T>::UPtrList(PtrList<T>& lst)
+:
+    ptrs_(lst.ptrs_)
+{}
+
+
+template<class T>
+inline Foam::UPtrList<T>::UPtrList(UPtrList<T>&& lst)
+:
+    ptrs_(std::move(lst.ptrs_))
+{}
+
+
+template<class T>
+inline Foam::UPtrList<T>::UPtrList(const Xfer<UPtrList<T>>& lst)
+{
+    transfer(lst());
+}
+
+
+template<class T>
+inline Foam::UPtrList<T>::UPtrList(UPtrList<T>& lst, bool reuse)
+:
+    ptrs_(lst.ptrs_, reuse)
+{}
+
+
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 template<class T>
@@ -39,6 +76,13 @@ inline bool Foam::UPtrList<T>::empty() const
 }
 
 
+template<class T>
+inline void Foam::UPtrList<T>::clear()
+{
+    ptrs_.clear();
+}
+
+
 template<class T>
 inline void Foam::UPtrList<T>::swap(UPtrList<T>& lst)
 {
@@ -46,6 +90,13 @@ inline void Foam::UPtrList<T>::swap(UPtrList<T>& lst)
 }
 
 
+template<class T>
+inline void Foam::UPtrList<T>::transfer(UPtrList<T>& lst)
+{
+    ptrs_.transfer(lst.ptrs_);
+}
+
+
 template<class T>
 inline T& Foam::UPtrList<T>::first()
 {
@@ -75,9 +126,36 @@ inline const T& Foam::UPtrList<T>::last() const
 
 
 template<class T>
-inline void Foam::UPtrList<T>::resize(const label newSize)
+inline void Foam::UPtrList<T>::setSize(const label newLen)
 {
-    this->setSize(newSize);
+    if (newLen <= 0)
+    {
+        clear();
+        return;
+    }
+
+    const label oldLen = this->size();
+    if (newLen != oldLen)
+    {
+        // Truncate or extend (new elements initialized to nullptr)
+        ptrs_.setSize(newLen, reinterpret_cast<T*>(0));
+    }
+}
+
+
+template<class T>
+inline void Foam::UPtrList<T>::resize(const label nElem)
+{
+    this->setSize(nElem);
+}
+
+
+template<class T>
+inline void Foam::UPtrList<T>::append(T* ptr)
+{
+    const label idx = this->size();
+    ptrs_.setSize(idx + 1);
+    ptrs_[idx] = ptr;
 }
 
 
@@ -153,158 +231,149 @@ inline Foam::UPtrList<T>::iterator::iterator(T** ptr)
     ptr_(ptr)
 {}
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator==(const iterator& iter) const
 {
     return ptr_ == iter.ptr_;
 }
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator!=(const iterator& iter) const
 {
     return ptr_ != iter.ptr_;
 }
 
+
 template<class T>
-inline T& Foam::UPtrList<T>::iterator::operator*()
+inline T& Foam::UPtrList<T>::iterator::operator*() const
 {
     return **ptr_;
 }
 
-template<class T>
-inline T& Foam::UPtrList<T>::iterator::operator()()
-{
-    return operator*();
-}
 
 template<class T>
-inline typename Foam::UPtrList<T>::iterator
+inline T& Foam::UPtrList<T>::iterator::operator()() const
+{
+    return **ptr_;
+}
+
+
+template<class T>
+inline typename Foam::UPtrList<T>::iterator&
 Foam::UPtrList<T>::iterator::operator++()
 {
     ++ptr_;
     return *this;
 }
 
+
 template<class T>
 inline typename Foam::UPtrList<T>::iterator
 Foam::UPtrList<T>::iterator::operator++(int)
 {
-    iterator tmp = *this;
+    iterator iter(*this);
     ++ptr_;
-    return tmp;
+    return iter;
 }
 
+
 template<class T>
-inline typename Foam::UPtrList<T>::iterator
+inline typename Foam::UPtrList<T>::iterator&
 Foam::UPtrList<T>::iterator::operator--()
 {
     --ptr_;
     return *this;
 }
 
+
 template<class T>
 inline typename Foam::UPtrList<T>::iterator
 Foam::UPtrList<T>::iterator::operator--(int)
 {
-    iterator tmp = *this;
+    iterator iter(*this);
     --ptr_;
-    return tmp;
+    return iter;
 }
 
+
 template<class T>
-inline typename Foam::UPtrList<T>::iterator
+inline typename Foam::UPtrList<T>::iterator&
 Foam::UPtrList<T>::iterator::operator+=(label n)
 {
     ptr_ += n;
     return *this;
 }
 
-template<class T>
-inline typename Foam::UPtrList<T>::iterator
-Foam::operator+(const typename UPtrList<T>::iterator& iter, label n)
-{
-    typename UPtrList<T>::iterator tmp = iter;
-    return tmp += n;
-}
 
 template<class T>
-inline typename Foam::UPtrList<T>::iterator
-Foam::operator+(label n, const typename UPtrList<T>::iterator& iter)
-{
-    typename UPtrList<T>::iterator tmp = iter;
-    return tmp += n;
-}
-
-template<class T>
-inline typename Foam::UPtrList<T>::iterator
+inline typename Foam::UPtrList<T>::iterator&
 Foam::UPtrList<T>::iterator::operator-=(label n)
 {
     ptr_ -= n;
     return *this;
 }
 
+
 template<class T>
 inline typename Foam::UPtrList<T>::iterator
-Foam::operator-(const typename UPtrList<T>::iterator& iter, label n)
+Foam::UPtrList<T>::iterator::operator+(label n) const
 {
-    typename UPtrList<T>::iterator tmp = iter;
-    return tmp -= n;
+    return iterator(ptr_ + n);
 }
 
-template<class T>
-inline Foam::label Foam::operator-
-(
-    const typename UPtrList<T>::iterator& iter1,
-    const typename UPtrList<T>::iterator& iter2
-)
-{
-    return (iter1.ptr_ - iter2.ptr_)/sizeof(T*);
-}
 
 template<class T>
-inline T& Foam::UPtrList<T>::iterator::operator[](label n)
+inline typename Foam::UPtrList<T>::iterator
+Foam::UPtrList<T>::iterator::operator-(label n) const
+{
+    return iterator(ptr_ - n);
+}
+
+
+template<class T>
+inline Foam::label
+Foam::UPtrList<T>::iterator::operator-(const iterator& iter) const
+{
+    return (ptr_ - iter.ptr_);
+}
+
+
+template<class T>
+inline T& Foam::UPtrList<T>::iterator::operator[](label n) const
 {
     return *(*this + n);
 }
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator<(const iterator& iter) const
 {
     return ptr_ < iter.ptr_;
 }
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator>(const iterator& iter) const
 {
     return ptr_ > iter.ptr_;
 }
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator<=(const iterator& iter) const
 {
     return ptr_ <= iter.ptr_;
 }
 
+
 template<class T>
 inline bool Foam::UPtrList<T>::iterator::operator>=(const iterator& iter) const
 {
     return ptr_ >= iter.ptr_;
 }
 
-template<class T>
-inline typename Foam::UPtrList<T>::iterator
-Foam::UPtrList<T>::begin()
-{
-    return ptrs_.begin();
-}
-
-template<class T>
-inline typename Foam::UPtrList<T>::iterator
-Foam::UPtrList<T>::end()
-{
-    return ptrs_.end();
-}
-
 
 // * * * * * * * * * * * * * * * STL const_iterator  * * * * * * * * * * * * //
 
@@ -343,21 +412,21 @@ inline bool Foam::UPtrList<T>::const_iterator::operator!=
 
 
 template<class T>
-inline const T& Foam::UPtrList<T>::const_iterator::operator*()
+inline const T& Foam::UPtrList<T>::const_iterator::operator*() const
 {
     return **ptr_;
 }
 
 
 template<class T>
-inline const T& Foam::UPtrList<T>::const_iterator::operator()()
+inline const T& Foam::UPtrList<T>::const_iterator::operator()() const
 {
-    return operator*();
+    return **ptr_;
 }
 
 
 template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
+inline typename Foam::UPtrList<T>::const_iterator&
 Foam::UPtrList<T>::const_iterator::operator++()
 {
     ++ptr_;
@@ -369,14 +438,14 @@ template<class T>
 inline typename Foam::UPtrList<T>::const_iterator
 Foam::UPtrList<T>::const_iterator::operator++(int)
 {
-    const_iterator tmp = *this;
+    const_iterator iter(*this);
     ++ptr_;
-    return tmp;
+    return iter;
 }
 
 
 template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
+inline typename Foam::UPtrList<T>::const_iterator&
 Foam::UPtrList<T>::const_iterator::operator--()
 {
     --ptr_;
@@ -388,14 +457,14 @@ template<class T>
 inline typename Foam::UPtrList<T>::const_iterator
 Foam::UPtrList<T>::const_iterator::operator--(int)
 {
-    const_iterator tmp = *this;
+    const_iterator iter(*this);
     --ptr_;
-    return tmp;
+    return iter;
 }
 
 
 template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
+inline typename Foam::UPtrList<T>::const_iterator&
 Foam::UPtrList<T>::const_iterator::operator+=(label n)
 {
     ptr_ += n;
@@ -404,25 +473,7 @@ Foam::UPtrList<T>::const_iterator::operator+=(label n)
 
 
 template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
-Foam::operator+(const typename UPtrList<T>::const_iterator& iter, label n)
-{
-    typename UPtrList<T>::const_iterator tmp = iter;
-    return tmp += n;
-}
-
-
-template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
-Foam::operator+(label n, const typename UPtrList<T>::const_iterator& iter)
-{
-    typename UPtrList<T>::const_iterator tmp = iter;
-    return tmp += n;
-}
-
-
-template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
+inline typename Foam::UPtrList<T>::const_iterator&
 Foam::UPtrList<T>::const_iterator::operator-=(label n)
 {
     ptr_ -= n;
@@ -432,26 +483,31 @@ Foam::UPtrList<T>::const_iterator::operator-=(label n)
 
 template<class T>
 inline typename Foam::UPtrList<T>::const_iterator
-Foam::operator-(const typename UPtrList<T>::const_iterator& iter, label n)
+Foam::UPtrList<T>::const_iterator::operator+(label n) const
 {
-    typename UPtrList<T>::const_iterator tmp = iter;
-    return tmp -= n;
+    return const_iterator(ptr_ + n);
 }
 
 
 template<class T>
-inline Foam::label Foam::operator-
-(
-    const typename UPtrList<T>::const_iterator& iter1,
-    const typename UPtrList<T>::const_iterator& iter2
-)
+inline typename Foam::UPtrList<T>::const_iterator
+Foam::UPtrList<T>::const_iterator::operator-(label n) const
 {
-    return (iter1.ptr_ - iter2.ptr_)/sizeof(T*);
+    return const_iterator(ptr_ - n);
 }
 
 
 template<class T>
-inline const T& Foam::UPtrList<T>::const_iterator::operator[](label n)
+inline Foam::label
+Foam::UPtrList<T>::const_iterator::operator-(const const_iterator& iter) const
+{
+    return (ptr_ - iter.ptr_);
+}
+
+
+template<class T>
+inline const T&
+Foam::UPtrList<T>::const_iterator::operator[](label n) const
 {
     return *(*this + n);
 }
@@ -497,6 +553,40 @@ inline bool Foam::UPtrList<T>::const_iterator::operator>=
 }
 
 
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+template<class T>
+inline typename Foam::UPtrList<T>::iterator
+Foam::UPtrList<T>::begin()
+{
+    return ptrs_.begin();
+}
+
+
+template<class T>
+inline typename Foam::UPtrList<T>::iterator
+Foam::UPtrList<T>::end()
+{
+    return ptrs_.end();
+}
+
+
+template<class T>
+inline typename Foam::UPtrList<T>::const_iterator
+Foam::UPtrList<T>::cbegin() const
+{
+    return ptrs_.cbegin();
+}
+
+
+template<class T>
+inline typename Foam::UPtrList<T>::const_iterator
+Foam::UPtrList<T>::cend() const
+{
+    return ptrs_.cend();
+}
+
+
 template<class T>
 inline typename Foam::UPtrList<T>::const_iterator
 Foam::UPtrList<T>::begin() const
@@ -513,19 +603,13 @@ Foam::UPtrList<T>::end() const
 }
 
 
-template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
-Foam::UPtrList<T>::cbegin() const
-{
-    return ptrs_.begin();
-}
-
+// * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
 template<class T>
-inline typename Foam::UPtrList<T>::const_iterator
-Foam::UPtrList<T>::cend() const
+inline void Foam::UPtrList<T>::operator=(UPtrList<T>&& lst)
 {
-    return ptrs_.end();
+    this->clear();
+    this->swap(lst);
 }