ENH: identityOp as equivalent to std::identity (C++20)

- similar to how noOp was defined, but with perfect forwarding

STYLE: combine Swap into stdFoam

STYLE: capitalize FileOp, NegateOp template parameters

applications/test/HashTable1/Test-HashTable1.C

@@ -33,7 +33,7 @@ License
 #include "IOstreams.H"
 #include "StringStream.H"
 #include "ListOps.H"
-#include "flipOp.H"
+#include "StringListOps.H"
 
 using namespace Foam;
 
@@ -216,7 +216,7 @@ int main()
             (
                 table1.keys().begin(),
                 table1.keys().end(),
-                noOp{}
+                identityOp{}
             )
         );
         sort(sortKeys);

applications/test/ITstream/Test-ITstream.C

@@ -34,7 +34,7 @@ Description
 #include "argList.H"
 #include "ITstream.H"
 #include "ListOps.H"
-#include "flipOp.H"
+#include "StringListOps.H"
 
 using namespace Foam;
 
@@ -172,7 +172,7 @@ int main(int argc, char *argv[])
         (
             stringInput.cbegin(),
             stringInput.cend(),
-            Foam::noOp{}
+            Foam::identityOp{}
         )
     );
 

applications/test/mapDistributePolyMesh/Test-mapDistributePolyMesh.C

@@ -85,7 +85,7 @@ int main(int argc, char *argv[])
         {
             const mapDistribute& faceMap = map.faceMap();
             pointField fc(mesh.faceCentres());
-            faceMap.distribute(fc, noOp());
+            faceMap.distribute(fc, identityOp());
             Pout<< "Construct size:" << faceMap.constructSize() << endl;
             forAll(distributedMesh.faceCentres(), facei)
             {
@@ -118,7 +118,7 @@ int main(int argc, char *argv[])
         {
             const mapDistribute& cellMap = map.cellMap();
             pointField cc(mesh.cellCentres());
-            cellMap.distribute(cc, noOp());
+            cellMap.distribute(cc, identityOp());
             Pout<< "Construct size:" << cellMap.constructSize() << endl;
             forAll(distributedMesh.cellCentres(), celli)
             {
@@ -131,7 +131,7 @@ int main(int argc, char *argv[])
         {
             const mapDistribute& pointMap = map.pointMap();
             pointField pc(mesh.points());
-            pointMap.distribute(pc, noOp());
+            pointMap.distribute(pc, identityOp());
             Pout<< "Construct size:" << pointMap.constructSize() << endl;
             forAll(distributedMesh.points(), pointi)
             {

applications/test/syncTools/Test-syncTools.C

@@ -614,7 +614,7 @@ void testEdgeFlip2(const polyMesh& mesh, Random& rndGen)
             edgePointCombineOp(),
             PointPair(point::max, point::max),
             edgePointTransformOp(),
-            noOp()
+            identityOp()
         );
 
         forAll(fld, edgeI)

applications/utilities/mesh/conversion/fluent3DMeshToFoam/fluent3DMeshToFoam.L

@@ -51,7 +51,6 @@ Description
 #include "wallPolyPatch.H"
 #include "symmetryPolyPatch.H"
 #include "oldCyclicPolyPatch.H"
-#include "Swap.H"
 #include "IFstream.H"
 #include "readHexLabel.H"
 

applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedCell/indexedCell.H

@@ -45,7 +45,6 @@ SourceFiles
 #include "List.H"
 #include "globalIndex.H"
 #include "Pstream.H"
-#include "Swap.H"
 #include "InfoProxy.H"
 #include "tetCell.H"
 #include "typeInfo.H"