typeIOobject: Template typed form of IOobject for type-checked object file and header reading

used to check the existence of and open an object file, read and check the
header without constructing the object.

'typeIOobject' operates in an equivalent and consistent manner to 'regIOobject'
but the type information is provided by the template argument rather than via
virtual functions for which the derived object would need to be constructed,
which is the case for 'regIOobject'.

'typeIOobject' replaces the previous separate functions 'typeHeaderOk' and
'typeFilePath' with a single consistent interface.

applications/utilities/postProcessing/dataConversion/foamToEnsight/checkData.H

@@ -16,6 +16,6 @@ for (label n1=0; n1<Times.size() && variableGood; ++n1)
             Times[n1].name(),
             mesh,
             IOobject::NO_READ
-        ).typeHeaderOk<volScalarField>(false);
+        ).headerOk();
     }
 }

applications/utilities/postProcessing/dataConversion/foamToEnsight/checkMeshMoving.H

@@ -9,7 +9,7 @@ if (Times.size() > 1)
     {
         if (Times[timeI].name() != mesh.pointsInstance())
         {
-            IOobject io
+            typeIOobject<pointIOField> io
             (
                 "points",
                 Times[timeI].name(),
@@ -17,7 +17,8 @@ if (Times.size() > 1)
                 mesh,
                 IOobject::NO_READ
             );
-            if (io.typeHeaderOk<pointIOField>(true))
+
+            if (io.headerOk())
             {
                 meshMoving = true;
                 break;

applications/utilities/postProcessing/dataConversion/foamToEnsight/foamToEnsight.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -584,10 +584,8 @@ int main(int argc, char *argv[])
                     IOobject::MUST_READ
                 );
 
-                bool fieldExists = fieldObject.typeHeaderOk<IOField<scalar>>
-                (
-                    false
-                );
+                bool fieldExists = fieldObject.headerOk();
+
                 if (fieldType == scalarIOField::typeName)
                 {
                     ensightCloudField<scalar>

applications/utilities/postProcessing/dataConversion/foamToEnsightParts/checkHasMovingMesh.H

@@ -6,13 +6,13 @@ if (timeDirs.size() > 1)
     hasMovingMesh = true;
     for (label i=0; i < timeDirs.size() && hasMovingMesh; ++i)
     {
-        hasMovingMesh = IOobject
+        hasMovingMesh = typeIOobject<pointIOField>
         (
             "points",
             timeDirs[i].name(),
             polyMesh::meshSubDir,
             mesh,
             IOobject::NO_READ
-        ).typeHeaderOk<pointIOField>(true);
+        ).headerOk();
     }
 }

applications/utilities/postProcessing/dataConversion/foamToEnsightParts/getTimeIndex.H

@@ -13,7 +13,7 @@
      && runTime.timeName() != "0"
     )
     {
-        IOobject io
+        typeIOobject<IOdictionary> io
         (
             "time",
             runTime.timeName(),
@@ -24,7 +24,7 @@
             false
         );
 
-        if (io.typeHeaderOk<IOdictionary>(true))
+        if (io.headerOk())
         {
             io.readOpt() = IOobject::MUST_READ_IF_MODIFIED;
             IOdictionary timeObject(io);
@@ -34,7 +34,7 @@
         else
         {
             Info<< "skip ... missing entry "
-                << io.objectPath<IOdictionary>() << endl;
+                << io.objectPath() << endl;
             continue;
         }
     }

applications/utilities/postProcessing/dataConversion/foamToEnsightParts/moveMesh.H

@@ -1,5 +1,5 @@
 {
-    IOobject io
+    typeIOobject<pointIOField> io
     (
         "points",
         runTime.timeName(),
@@ -7,7 +7,7 @@
         mesh
     );
 
-    if (io.typeHeaderOk<pointIOField>(true))
+    if (io.headerOk())
     {
         // Read new points
         io.readOpt() = IOobject::MUST_READ;

applications/utilities/postProcessing/dataConversion/foamToGMV/gmvOutput.H

@@ -71,13 +71,7 @@ for (label i=0; i < nTypes; i++)
             IOobject::NO_READ
         );
 
-        if
-        (
-            lagrangianHeader.typeHeaderOk<IOPosition<Cloud<passiveParticle>>>
-            (
-                false
-            )
-        )
+        if (lagrangianHeader.headerOk())
         {
             Cloud<passiveParticle> particles(mesh, cloud::defaultName);
 

applications/utilities/postProcessing/dataConversion/foamToGMV/moveMesh.H

@@ -1,4 +1,4 @@
-IOobject ioPoints
+typeIOobject<pointIOField> ioPoints
 (
     "points",
     runTime.timeName(),
@@ -6,7 +6,7 @@ IOobject ioPoints
     mesh
 );
 
-if (ioPoints.typeHeaderOk<pointIOField>(true))
+if (ioPoints.headerOk())
 {
     Info<< "new points available" << endl;
     // Reading new points