ENH: additional contiguous traits (#1378)

- change contiguous from a series of global functions to separate
  templated traits classes:

    - is_contiguous
    - is_contiguous_label
    - is_contiguous_scalar

  The static constexpr 'value' and a constexpr conversion operator
  allow use in template expressions.  The change also makes it much
  easier to define general traits and to inherit from them.

  The is_contiguous_label and is_contiguous_scalar are special traits
  for handling data of homogeneous components of the respective types.

src/meshTools/algorithms/PatchEdgeFaceWave/patchEdgeFaceInfo.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2016 OpenFOAM Foundation
@@ -49,14 +49,9 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
-
+// Forward Declarations
 class polyPatch;
 class polyMesh;
-
-
-// Forward declaration of friend functions and operators
-
 class patchEdgeFaceInfo;
 
 Istream& operator>>(Istream&, patchEdgeFaceInfo&);
@@ -201,12 +196,13 @@ public:
 };
 
 
-//- Data associated with patchEdgeFaceInfo type are contiguous
-template<>
-inline bool contiguous<patchEdgeFaceInfo>()
-{
-    return true;
-}
+// * * * * * * * * * * * * * * * * * Traits  * * * * * * * * * * * * * * * * //
+
+//- Contiguous data for patchEdgeFaceInfo
+template<> struct is_contiguous<patchEdgeFaceInfo> : std::true_type {};
+
+//- Contiguous scalar data for patchEdgeFaceInfo
+template<> struct is_contiguous_scalar<patchEdgeFaceInfo> : std::true_type {};
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

src/meshTools/algorithms/PatchEdgeFaceWave/patchEdgeFaceRegion.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2012-2016 OpenFOAM Foundation
@@ -51,13 +51,9 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
+// Forward Declarations
 class polyPatch;
 class polyMesh;
-
-
-// Forward declaration of friend functions and operators
-
 class patchEdgeFaceRegion;
 
 Istream& operator>>(Istream&, patchEdgeFaceRegion&);
@@ -181,12 +177,13 @@ public:
 };
 
 
-//- Data associated with patchEdgeFaceRegion type are contiguous
-template<>
-inline bool contiguous<patchEdgeFaceRegion>()
-{
-    return true;
-}
+// * * * * * * * * * * * * * * * * * Traits  * * * * * * * * * * * * * * * * //
+
+//- Contiguous data for patchEdgeFaceRegion
+template<> struct is_contiguous<patchEdgeFaceRegion> : std::true_type {};
+
+//- Contiguous label data for patchEdgeFaceRegion
+template<> struct is_contiguous_label<patchEdgeFaceRegion> : std::true_type {};
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

src/meshTools/algorithms/PointEdgeWave/PointData.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2015 OpenFOAM Foundation
@@ -46,13 +46,11 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
+// Forward Declarations
 class Istream;
 class Ostream;
-template<class DataType>
-class PointData;
+template<class DataType> class PointData;
 
-// Forward declaration of friend functions and operators
 template<class DataType>
 Ostream& operator<<(Ostream&, const PointData<DataType>&);
 template<class DataType>
@@ -67,8 +65,6 @@ class PointData
 :
     public pointEdgePoint
 {
-private:
-
     // Private data
 
         //- Additional transported data
@@ -178,21 +174,20 @@ public:
         );
 };
 
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-//- Data associated with PointData types is contiguous
+// * * * * * * * * * * * * * * * * * Traits  * * * * * * * * * * * * * * * * //
 
-template<>
-inline bool contiguous<PointData<scalar>>()
-{
-    return true;
-}
+//- Data are contiguous if data type is contiguous
+template<class DataType>
+struct is_contiguous<PointData<DataType>> : is_contiguous<DataType> {};
+
+//- Contiguous scalar only when data type is also scalar
+template<class DataType>
+struct is_contiguous_scalar<PointData<DataType>>
+:
+    is_contiguous_scalar<DataType>
+{};
 
-template<>
-inline bool contiguous<PointData<vector>>()
-{
-    return true;
-}
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 

src/meshTools/algorithms/PointEdgeWave/pointEdgePoint.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2016 OpenFOAM Foundation
@@ -51,13 +51,9 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
+// Forward Declarations
 class polyPatch;
 class polyMesh;
-
-
-// Forward declaration of friend functions and operators
-
 class pointEdgePoint;
 
 Istream& operator>>(Istream&, pointEdgePoint&);
@@ -237,12 +233,13 @@ public:
 };
 
 
-//- Data associated with pointEdgePoint type are contiguous
-template<>
-inline bool contiguous<pointEdgePoint>()
-{
-    return true;
-}
+// * * * * * * * * * * * * * * * * * Traits  * * * * * * * * * * * * * * * * //
+
+//- Contiguous data for pointEdgePoint
+template<> struct is_contiguous<pointEdgePoint> : std::true_type {};
+
+//- Contiguous scalar data for pointEdgePoint
+template<> struct is_contiguous_scalar<pointEdgePoint> : std::true_type {};
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //