STYLE: make polyMesh constructor explicit

- use polyMesh::defaultRegion instead of fvMesh::defaultRegion and
  others via static inheritance. (92 vs ~25 occurrences)

src/OpenFOAM/include/createMeshNoClear.H

@@ -33,7 +33,7 @@ Foam::fvMesh mesh
 (
     Foam::IOobject
     (
-        Foam::fvMesh::defaultRegion,
+        Foam::polyMesh::defaultRegion,
         runTime.timeName(),
         runTime,
         Foam::IOobject::MUST_READ

src/OpenFOAM/meshes/polyMesh/polyMesh.H

@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2017, 2020 OpenFOAM Foundation
-    Copyright (C) 2018-2020 OpenCFD Ltd.
+    Copyright (C) 2018-2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -325,7 +325,7 @@ public:
     // Constructors
 
         //- Read construct from IOobject
-        polyMesh(const IOobject& io, const bool doInit = true);
+        explicit polyMesh(const IOobject& io, const bool doInit = true);
 
         //- Construct from IOobject or as zero-sized mesh
         //  Boundary is added using addPatches() member function

src/dynamicFvMesh/dynamicFvMesh/dynamicFvMeshNew.C

@@ -154,7 +154,7 @@ Foam::autoPtr<Foam::dynamicFvMesh> Foam::dynamicFvMesh::New
             (
                 IOobject
                 (
-                    dynamicFvMesh::defaultRegion,
+                    polyMesh::defaultRegion,
                     runTime.timeName(),
                     runTime,
                     IOobject::MUST_READ
@@ -168,7 +168,7 @@ Foam::autoPtr<Foam::dynamicFvMesh> Foam::dynamicFvMesh::New
             (
                 IOobject
                 (
-                    dynamicFvMesh::defaultRegion,
+                    polyMesh::defaultRegion,
                     runTime.timeName(),
                     runTime,
                     IOobject::MUST_READ

src/dynamicFvMesh/include/createNamedDynamicFvMesh.H

@@ -1,4 +1,4 @@
-    Foam::word regionName = Foam::fvMesh::defaultRegion;
+    Foam::word regionName = Foam::polyMesh::defaultRegion;
 
     if (args.readIfPresent("region", regionName))
     {

src/dynamicMesh/fvMeshDistribute/fvMeshDistribute.C

@@ -1756,7 +1756,7 @@ Foam::autoPtr<Foam::fvMesh> Foam::fvMeshDistribute::receiveMesh
     (
         IOobject
         (
-            fvMesh::defaultRegion,
+            polyMesh::defaultRegion,
             runTime.timeName(),
             runTime,
             IOobject::NO_READ

src/engine/include/createEngineMesh.H

@@ -7,7 +7,7 @@
         (
             IOobject
             (
-                engineMesh::defaultRegion,
+                polyMesh::defaultRegion,
                 runTime.timeName(),
                 runTime,
                 Foam::IOobject::MUST_READ

src/finiteVolume/fvMesh/simplifiedFvMesh/columnFvMesh/columnFvMesh.C

@@ -103,7 +103,7 @@ bool Foam::simplifiedMeshes::columnFvMeshInfo::setPatchEntries
         (
             runTime,
             runTime.timeName(),
-            (regionName_ == fvMesh::defaultRegion ? "" : regionName_)
+            (regionName_ == polyMesh::defaultRegion ? "" : regionName_)
         );
 
         if (objects.empty())
@@ -411,7 +411,7 @@ Foam::simplifiedMeshes::columnFvMeshInfo::columnFvMeshInfo
     regionName_(regionName),
     regionPrefix_
     (
-        regionName_ == fvMesh::defaultRegion
+        regionName_ == polyMesh::defaultRegion
       ? ""
       : regionName_ + '/'
     ),

src/finiteVolume/fvMesh/simplifiedFvMesh/columnFvMesh/columnFvMesh.H

@@ -149,7 +149,7 @@ public:
     columnFvMesh
     (
         const Time& runTime,
-        const word& regionName = fvMesh::defaultRegion
+        const word& regionName = polyMesh::defaultRegion
     );
 };
 

src/functionObjects/field/streamLine/streamLineBase.C

@@ -663,7 +663,7 @@ bool Foam::functionObjects::streamLineBase::writeToFile()
         (
             time_.globalPath()/functionObject::outputPrefix/"sets"/name()
         );
-        if (mesh_.name() != fvMesh::defaultRegion)
+        if (mesh_.name() != polyMesh::defaultRegion)
         {
             vtkPath = vtkPath/mesh_.name();
         }

src/sampling/sampledSet/sampledSets/sampledSets.C

@@ -104,7 +104,7 @@ Foam::sampledSets::sampledSets
         mesh_.time().globalPath()/functionObject::outputPrefix/name
     );
 
-    if (mesh_.name() != fvMesh::defaultRegion)
+    if (mesh_.name() != polyMesh::defaultRegion)
     {
         outputPath_ = outputPath_/mesh_.name();
     }
@@ -137,7 +137,7 @@ Foam::sampledSets::sampledSets
         mesh_.time().globalPath()/functionObject::outputPrefix/name
     );
 
-    if (mesh_.name() != fvMesh::defaultRegion)
+    if (mesh_.name() != polyMesh::defaultRegion)
     {
         outputPath_ = outputPath_/mesh_.name();
     }