ENH: avoid xfer on simple data types

- in many places can use move construcors or rely on RVO

applications/test/fileName/Test-fileName.C

@@ -194,6 +194,7 @@ int main(int argc, char *argv[])
     argList::addBoolOption("ext", "test handing of file extensions");
     argList::addBoolOption("construct", "test constructors");
     argList::addBoolOption("relative", "test relative operations");
+    argList::addBoolOption("system", "test filesystem operations");
     argList::addBoolOption("default", "reinstate default tests");
     argList::addNote("runs default tests or specified ones only");
 
@@ -485,72 +486,8 @@ int main(int argc, char *argv[])
     }
 
 
-    if (!defaultTests)
-    {
-        return 0;
-    }
-
-    DynamicList<word> wrdList
-    {
-        "hello",
-        "hello1",
-        "hello2",
-        "hello3",
-        "hello4.hmm"
-    };
-
-    fileName pathName(wrdList);
-
-    Info<< "pathName = " << pathName << nl
-        << "pathName.name()     = >" << pathName.name() << "<\n"
-        << "pathName.path()     = "  << pathName.path() << nl
-        << "pathName.ext()      = >" << pathName.ext() << "<\n"
-        << "pathName.name(true) = >" << pathName.name(true) << "<\n";
-
-    Info<< "pathName.components() = " << pathName.components() << nl
-        << "pathName.component(2) = " << pathName.component(2) << nl
-        << endl;
-
-    // try with different combination
-    // The final one should emit warnings
-    for (label start = 0; start <= wrdList.size(); ++start)
-    {
-        fileName instance, local;
-        word name;
-
-        fileName path(SubList<word>(wrdList, wrdList.size()-start, start));
-        fileName path2 = "."/path;
-
-        IOobject::fileNameComponents
-        (
-            path,
-            instance,
-            local,
-            name
-        );
-
-        Info<< "IOobject::fileNameComponents for " << path << nl
-            << "  instance = " << instance << nl
-            << "  local    = " << local << nl
-            << "  name     = " << name << endl;
-
-        IOobject::fileNameComponents
-        (
-            path2,
-            instance,
-            local,
-            name
-        );
-
-        Info<< "IOobject::fileNameComponents for " << path2 << nl
-            << "  instance = " << instance << nl
-            << "  local    = " << local << nl
-            << "  name     = " << name << endl;
-
-    }
-
-
     // Test some copying and deletion
+    if (args.found("system"))
     {
         const fileName dirA("dirA");
         const fileName lnA("lnA");
@@ -663,6 +600,71 @@ int main(int argc, char *argv[])
     }
 
 
+    if (!defaultTests)
+    {
+        return 0;
+    }
+
+    DynamicList<word> wrdList
+    {
+        "hello",
+        "hello1",
+        "hello2",
+        "hello3",
+        "hello4.hmm"
+    };
+
+    fileName pathName(wrdList);
+
+    Info<< "pathName = " << pathName << nl
+        << "pathName.name()     = >" << pathName.name() << "<\n"
+        << "pathName.path()     = "  << pathName.path() << nl
+        << "pathName.ext()      = >" << pathName.ext() << "<\n"
+        << "pathName.name(true) = >" << pathName.name(true) << "<\n";
+
+    Info<< "pathName.components() = " << pathName.components() << nl
+        << "pathName.component(2) = " << pathName.component(2) << nl
+        << endl;
+
+    // try with different combination
+    // The final one should emit warnings
+    for (label start = 0; start <= wrdList.size(); ++start)
+    {
+        fileName instance, local;
+        word name;
+
+        fileName path(SubList<word>(wrdList, wrdList.size()-start, start));
+        fileName path2 = "."/path;
+
+        IOobject::fileNameComponents
+        (
+            path,
+            instance,
+            local,
+            name
+        );
+
+        Info<< "IOobject::fileNameComponents for " << path << nl
+            << "  instance = " << instance << nl
+            << "  local    = " << local << nl
+            << "  name     = " << name << endl;
+
+        IOobject::fileNameComponents
+        (
+            path2,
+            instance,
+            local,
+            name
+        );
+
+        Info<< "IOobject::fileNameComponents for " << path2 << nl
+            << "  instance = " << instance << nl
+            << "  local    = " << local << nl
+            << "  name     = " << name << endl;
+
+    }
+
+
     // test findEtcFile
     Info<< "\n\nfindEtcFile tests:" << nl
         << " controlDict => " << findEtcFile("controlDict") << nl

applications/test/fileNameClean/Test-fileNameClean.C

@@ -46,6 +46,9 @@ void printCleaning(fileName& pathName)
         << "  name() = " << pathName.name() << nl
         << "  joined = " << pathName.path()/pathName.name() << nl << nl;
 
+    Info<< "components  = " << flatOutput(pathName.components()) << nl;
+    Info<< "component 2 = " << pathName.component(2) << nl;
+
     pathName.clean();
 
     Info<< "cleaned  = " << pathName << nl

src/OpenFOAM/global/fileOperations/masterUncollatedFileOperation/masterUncollatedFileOperation.C

@@ -1458,7 +1458,7 @@ Foam::instantList Foam::fileOperations::masterUncollatedFileOperation::findTimes
         }
         Pstream::scatter(times);
 
-        instantList* tPtr = new instantList(times.xfer());
+        instantList* tPtr = new instantList(std::move(times));
 
         times_.insert(directory, tPtr);
 

src/OpenFOAM/meshes/meshShapes/cell/cell.H

@@ -69,11 +69,11 @@ public:
         //- Construct given size, with invalid point labels (-1)
         explicit inline cell(const label sz);
 
-        //- Construct from list of labels
+        //- Copy construct from list of labels
         explicit inline cell(const labelUList& lst);
 
-        //- Construct by transferring list of labels
-        explicit inline cell(const Xfer<labelList>& lst);
+        //- Move construct from list of labels
+        explicit inline cell(labelList&& lst);
 
         //- Construct from Istream
         inline cell(Istream& is);

src/OpenFOAM/meshes/meshShapes/cell/cellI.H

@@ -41,9 +41,9 @@ inline Foam::cell::cell(const labelUList& lst)
 {}
 
 
-inline Foam::cell::cell(const Xfer<labelList>& lst)
+inline Foam::cell::cell(labelList&& lst)
 :
-    labelList(lst)
+    labelList(std::move(lst))
 {}
 
 

src/OpenFOAM/meshes/meshShapes/face/face.C

@@ -606,23 +606,26 @@ Foam::face Foam::face::reverseFace() const
     // Reverse the label list and return
     // The starting points of the original and reverse face are identical.
 
-    const labelList& f = *this;
-    labelList newList(size());
+    const labelUList& origFace = *this;
+    const label len = origFace.size();
 
-    newList[0] = f[0];
-
-    for (label pointi = 1; pointi < newList.size(); pointi++)
+    face newFace(len);
+    if (len)
     {
-        newList[pointi] = f[size() - pointi];
+        newFace[0] = origFace[0];
+        for (label i=1; i < len; ++i)
+        {
+            newFace[i] = origFace[len - i];
+        }
     }
 
-    return face(xferMove(newList));
+    return newFace;
 }
 
 
 Foam::label Foam::face::which(const label globalIndex) const
 {
-    const labelList& f = *this;
+    const labelUList& f = *this;
 
     forAll(f, localIdx)
     {

src/OpenFOAM/meshes/meshShapes/face/face.H

@@ -150,20 +150,17 @@ public:
         //- Construct given size, with invalid point labels (-1)
         explicit inline face(const label sz);
 
-        //- Construct from list of labels
+        //- Copy construct from list of labels
         explicit inline face(const labelUList& lst);
 
-        //- Construct from list of labels
+        //- Copy construct from list of labels
         template<unsigned Size>
         explicit inline face(const FixedList<label, Size>& lst);
 
-        //- Construct from an initializer list of labels
+        //- Copy construct from an initializer list of labels
         explicit inline face(std::initializer_list<label> lst);
 
-        //- Transfer (move) construct
-        explicit inline face(const Xfer<labelList>& lst);
-
-        //- Move construct
+        //- Move construct from list of labels
         explicit inline face(labelList&& lst);
 
         //- Copy construct from triFace

src/OpenFOAM/meshes/meshShapes/face/faceI.H

@@ -70,12 +70,6 @@ inline Foam::face::face(std::initializer_list<label> lst)
 {}
 
 
-inline Foam::face::face(const Xfer<labelList>& lst)
-:
-    labelList(lst)
-{}
-
-
 inline Foam::face::face(labelList&& lst)
 :
     labelList(std::move(lst))

src/OpenFOAM/meshes/polyMesh/globalMeshData/globalIndex.C

@@ -94,12 +94,6 @@ Foam::globalIndex::globalIndex(const label localSize)
 }
 
 
-Foam::globalIndex::globalIndex(const labelList& offsets)
-:
-    offsets_(offsets)
-{}
-
-
 Foam::globalIndex::globalIndex(Istream& is)
 {
     is >> offsets_;

src/OpenFOAM/meshes/polyMesh/globalMeshData/globalIndex.H

@@ -74,7 +74,7 @@ public:
     // Constructors
 
         //- Construct null
-        inline globalIndex();
+        globalIndex() = default;
 
         //- Construct from local max size. Does communication with default
         //  communicator and message tag.
@@ -90,11 +90,11 @@ public:
             const bool parallel     // use parallel comms
         );
 
-        //- Construct from components
-        globalIndex(const labelList& offsets);
+        //- Copy construct from list of labels
+        inline globalIndex(const labelUList& offsets);
 
-        //- Construct from components
-        inline globalIndex(const Xfer<labelList>& offsets);
+        //- Move construct from list of labels
+        inline globalIndex(labelList&& offsets);
 
         //- Construct from Istream
         globalIndex(Istream& is);

src/OpenFOAM/meshes/polyMesh/globalMeshData/globalIndexI.H

@@ -27,13 +27,15 @@ License
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::globalIndex::globalIndex()
+inline Foam::globalIndex::globalIndex(const labelUList& offsets)
+:
+    offsets_(offsets)
 {}
 
 
-Foam::globalIndex::globalIndex(const Xfer<labelList>& offsets)
+inline Foam::globalIndex::globalIndex(labelList&& offsets)
 :
-    offsets_(offsets)
+    offsets_(std::move(offsets))
 {}
 
 

src/OpenFOAM/meshes/polyMesh/globalMeshData/globalMeshData.C

@@ -1545,9 +1545,8 @@ void Foam::globalMeshData::calcGlobalPointBoundaryCells() const
     }
 
 
-    boundaryCellsPtr_.reset(new labelList());
+    boundaryCellsPtr_.reset(new labelList(std::move(cellMap)));
     labelList& boundaryCells = boundaryCellsPtr_();
-    boundaryCells.transfer(cellMap.shrink());
 
 
     // Convert point-cells to global (boundary)cell numbers

src/OpenFOAM/primitives/strings/fileName/fileName.C

@@ -29,6 +29,7 @@ License
 #include "OSspecific.H"
 #include "wordRe.H"
 #include "fileOperation.H"
+#include "stringOps.H"
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
@@ -463,28 +464,20 @@ bool Foam::fileName::hasExt(const wordRe& ending) const
 
 Foam::wordList Foam::fileName::components(const char delimiter) const
 {
-    DynamicList<word> wrdList(20);
+    const auto parsed = stringOps::split<string>(*this, delimiter);
 
-    size_type beg=0, end=0;
+    wordList words(parsed.size());
 
-    while ((end = find(delimiter, beg)) != npos)
+    label i = 0;
+    for (const auto& sub : parsed)
     {
-        // Avoid empty element (caused by doubled slashes)
-        if (beg < end)
-        {
-            wrdList.append(substr(beg, end-beg));
-        }
-        beg = end + 1;
+        // Could easily filter out '.' here too
+        words[i] = sub.str();
+        ++i;
     }
 
-    // Avoid empty trailing element
-    if (beg < size())
-    {
-        wrdList.append(substr(beg));
-    }
-
-    // Transfer to wordList
-    return wordList(wrdList.xfer());
+    // As a plain wordList
+    return words;
 }
 
 
@@ -494,7 +487,14 @@ Foam::word Foam::fileName::component
     const char delimiter
 ) const
 {
-    return components(delimiter)[cmpt];
+    const auto parsed = stringOps::split<string>(*this, delimiter);
+
+    if (cmpt < parsed.size())
+    {
+        return parsed[cmpt].str();
+    }
+
+    return word();
 }
 
 

src/conversion/polyDualMesh/polyDualMesh.C

@@ -545,8 +545,6 @@ void Foam::polyDualMesh::splitFace
                 if (subFace.size() > 2)
                 {
                     // Enough vertices to create a face from.
-                    subFace.shrink();
-
                     dualFaces.append(face(subFace));
                     dualOwner.append(meshPointi);
                     dualNeighbour.append(-1);
@@ -559,8 +557,6 @@ void Foam::polyDualMesh::splitFace
             if (subFace.size() > 2)
             {
                 // Enough vertices to create a face from.
-                subFace.shrink();
-
                 dualFaces.append(face(subFace));
                 dualOwner.append(meshPointi);
                 dualNeighbour.append(-1);
@@ -1194,18 +1190,10 @@ void Foam::polyDualMesh::calcDual
 
     // Transfer face info to straight lists
     // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-    faceList dualFaces(dynDualFaces.shrink(), true);
-    dynDualFaces.clear();
-
-    labelList dualOwner(dynDualOwner.shrink(), true);
-    dynDualOwner.clear();
-
-    labelList dualNeighbour(dynDualNeighbour.shrink(), true);
-    dynDualNeighbour.clear();
-
-    labelList dualRegion(dynDualRegion.shrink(), true);
-    dynDualRegion.clear();
-
+    faceList dualFaces(std::move(dynDualFaces));
+    labelList dualOwner(std::move(dynDualOwner));
+    labelList dualNeighbour(std::move(dynDualNeighbour));
+    labelList dualRegion(std::move(dynDualRegion));
 
 
     // Dump faces.

src/lagrangian/molecularDynamics/potential/potential/potential.C

@@ -89,7 +89,7 @@ void Foam::potential::setSiteIdList(const dictionary& moleculePropertiesDict)
         }
     }
 
-    siteIdList_.transfer(pairPotentialSiteIdList.shrink());
+    siteIdList_.transfer(pairPotentialSiteIdList);
 }
 
 

src/meshTools/regionSplit/regionSplit.C

@@ -172,7 +172,7 @@ Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
         {
             offsets[i] = mesh().nFaces();
         }
-        const globalIndex globalRegions(offsets.xfer());
+        const globalIndex globalRegions(std::move(offsets));
 
         // Minimise regions across connected cells
         // Note: still uses global decisions so all processors are running
@@ -215,7 +215,7 @@ Foam::autoPtr<Foam::globalIndex> Foam::regionSplit::calcRegionSplit
             compactOffsets[i] = globalToCompact.size();
         }
 
-        return autoPtr<globalIndex>(new globalIndex(compactOffsets.xfer()));
+        return autoPtr<globalIndex>(new globalIndex(std::move(compactOffsets)));
     }
 
 

src/meshTools/searchableSurfaces/searchableSurfaceCollection/searchableSurfaceCollection.C

@@ -285,7 +285,7 @@ Foam::searchableSurfaceCollection::~searchableSurfaceCollection()
 
 const Foam::wordList& Foam::searchableSurfaceCollection::regions() const
 {
-    if (regions_.size() == 0)
+    if (regions_.empty())
     {
         regionOffset_.setSize(subGeom_.size());
 
@@ -309,7 +309,7 @@ const Foam::wordList& Foam::searchableSurfaceCollection::regions() const
                 }
             }
         }
-        regions_.transfer(allRegions.shrink());
+        regions_.transfer(allRegions);
     }
     return regions_;
 }

src/parallel/distributed/distributedTriSurfaceMesh/distributedTriSurfaceMesh.C

@@ -298,8 +298,8 @@ Foam::distributedTriSurfaceMesh::distributeSegments
             sendMap[proci].transfer(dynSendMap[proci]);
         }
 
-        allSegments.transfer(dynAllSegments.shrink());
-        allSegmentMap.transfer(dynAllSegmentMap.shrink());
+        allSegments.transfer(dynAllSegments);
+        allSegmentMap.transfer(dynAllSegmentMap);
     }
 
 
@@ -743,9 +743,9 @@ Foam::distributedTriSurfaceMesh::calcLocalQueries
             sendMap[proci].transfer(dynSendMap[proci]);
         }
 
-        allCentres.transfer(dynAllCentres.shrink());
-        allRadiusSqr.transfer(dynAllRadiusSqr.shrink());
-        allSegmentMap.transfer(dynAllSegmentMap.shrink());
+        allCentres.transfer(dynAllCentres);
+        allRadiusSqr.transfer(dynAllRadiusSqr);
+        allSegmentMap.transfer(dynAllSegmentMap);
     }