ENH: boolVector for specialized bundling of boolean values

- bundled of boolean values as a vector of 3 components with
  element access using x(), y() and z() member functions.
  It also has some methods similar to bitSet.

- Not derived from Vector or VectorSpace since it does not share very
  many vector-like characteristics.

applications/test/boolVector/Test-boolVector.C

@@ -0,0 +1,89 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | www.openfoam.com
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+    Copyright (C) 2020 OpenCFD Ltd.
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Application
+    Test-boolVector
+
+Description
+    Some simple tests for boolVector
+
+\*---------------------------------------------------------------------------*/
+
+#include "boolVector.H"
+#include "IOstreams.H"
+#include "Switch.H"
+
+using namespace Foam;
+
+void print(const boolVector& v)
+{
+    Info<< v
+        << " any:" << Switch::name(v.any())
+        << " all:" << Switch::name(v.all())
+        << " none:" << Switch::name(v.none())
+        << " count:" << v.count() << nl;
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+//  Main program:
+
+int main(int argc, char *argv[])
+{
+    Info<< "boolVector" << nl
+        << "  size = " << boolVector::size() << nl
+        << "  contiguous = " << is_contiguous<boolVector>::value << nl
+        << nl;
+
+    {
+        boolVector vec;
+        Info<< "null: " << vec << nl;
+    }
+
+    Info<< "false: " << boolVector(false) << nl;
+    Info<< "true: " << boolVector(true) << nl;
+    Info<< "zero: " << boolVector(Zero) << nl;
+    Info<< nl;
+
+    {
+        boolVector vec{1, 0, 1};
+        print(vec);
+
+        vec.flip();
+        print(vec);
+
+        vec = false;
+        print(vec);
+
+        vec = true;
+        print(vec);
+    }
+
+    Info<< "\nEnd\n" << nl;
+
+    return 0;
+}
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //