ENH: minor adjustment to BitOps and PackedList

- extend toc/sortedToc wrappers to bitSet and labelHashSet to allow
  use of BitOps::toc(...) in templated code

- size_data() method to return the number of addressed integer blocks
  similar to size_bytes() does, but for int instead of char.

src/OpenFOAM/containers/Bits/BitOps/BitOps.C

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2018-2022 OpenCFD Ltd.
+    Copyright (C) 2018-2023 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -205,6 +205,30 @@ Foam::List<Foam::label> Foam::BitOps::sortedToc(const UList<bool>& bools)
 }
 
 
+Foam::List<Foam::label> Foam::BitOps::toc(const bitSet& bitset)
+{
+    return bitset.toc();
+}
+
+
+Foam::List<Foam::label> Foam::BitOps::sortedToc(const bitSet& bitset)
+{
+    return bitset.sortedToc();
+}
+
+
+Foam::List<Foam::label> Foam::BitOps::toc(const labelHashSet& hashset)
+{
+    return hashset.sortedToc();
+}
+
+
+Foam::List<Foam::label> Foam::BitOps::sortedToc(const labelHashSet& hashset)
+{
+    return hashset.sortedToc();
+}
+
+
 // * * * * * * * * * * * * * * * * BitSetOps * * * * * * * * * * * * * * * * //
 
 Foam::bitSet Foam::BitSetOps::create

src/OpenFOAM/containers/Bits/BitOps/BitOps.H

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2018-2022 OpenCFD Ltd.
+    Copyright (C) 2018-2023 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -163,6 +163,28 @@ List<label> toc(const UList<bool>& bools);
 List<label> sortedToc(const UList<bool>& bools);
 
 
+//- Forward to bitSet::toc(), the sorted values of the 'on' entries.
+//
+//  \return a List of labels
+List<label> toc(const bitSet& bitset);
+
+//- Forward to bitSet::sortedToc(), the sorted values of the 'on' entries.
+//
+//  \return a List of labels
+List<label> sortedToc(const bitSet& bitset);
+
+
+//- Forward to labelHashSet::sortedToc(), the sorted values of the 'on' entries.
+//
+//  \return a List of labels
+List<label> toc(const labelHashSet& hashset);
+
+//- Forward to labelHashSet::sortedToc(), the sorted values of the 'on' entries.
+//
+//  \return a List of labels
+List<label> sortedToc(const labelHashSet& hashset);
+
+
 //- Count arbitrary number of bits (of an integral type)
 template<class UIntType>
 inline unsigned int bit_count(UIntType x)

src/OpenFOAM/containers/Bits/PackedList/PackedList.H

@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2016 OpenFOAM Foundation
-    Copyright (C) 2017-2022 OpenCFD Ltd.
+    Copyright (C) 2017-2023 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -409,6 +409,9 @@ public:
         //- A pointer to the raw storage, reinterpreted as byte data
         inline char* data_bytes() noexcept;
 
+        //- The number of integer blocks addressed in the raw storage
+        inline std::streamsize size_data() const noexcept;
+
         //- The number of bytes used in the raw storage
         //- including any unused padding.
         inline std::streamsize size_bytes() const noexcept;

src/OpenFOAM/containers/Bits/PackedList/PackedListI.H

@@ -571,6 +571,13 @@ inline char* Foam::PackedList<Width>::data_bytes() noexcept
 }
 
 
+template<unsigned Width>
+inline std::streamsize Foam::PackedList<Width>::size_data() const noexcept
+{
+    return num_blocks(size());
+}
+
+
 template<unsigned Width>
 inline std::streamsize Foam::PackedList<Width>::size_bytes() const noexcept
 {