ENH: additional construct/assignment methods for complex (#1247)

- construct/assign from Zero

applications/test/complex/Make/files

@@ -0,0 +1,3 @@
+Test-complex.C
+
+EXE = $(FOAM_USER_APPBIN)/Test-complex

applications/test/complex/Make/options

@@ -0,0 +1,2 @@
+/* EXE_INC = */
+/* EXE_LIBS = */

applications/test/complex/Test-complex.C

@@ -0,0 +1,93 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+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
+
+Description
+    Some tests for complex numbers
+\*---------------------------------------------------------------------------*/
+
+#include "argList.H"
+#include "complex.H"
+#include "complexVector.H"
+#include "Field.H"
+
+using namespace Foam;
+
+void print1(const complex& z)
+{
+    Info<<"r: " << z.real() << " i: " << z.imag() << nl;
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+//  Main program:
+
+int main(int argc, char *argv[])
+{
+    Info<< "complex()     : " << complex() << nl
+        << "complex(zero) : " << complex(Zero) << nl
+        << "complex::zero : " << complex::zero << nl
+        << "complex::one  : " << complex::one << nl
+        << "complex(scalar) : " << complex(3.14519) << nl
+        << nl;
+
+    Info<< "complexVector::zero : " << complexVector::zero << nl
+        << "complexVector::one  : " << complexVector::one << nl
+        << nl;
+
+    // Comparison
+
+    for (complex c :  { complex{1, 0}, complex{1, 2}} )
+    {
+        print1(c);
+        // TDB: allow implicit construct from scalar?
+        //
+        // if (c == 1.0)
+        // {
+        //     Info<< c << " == " << 1 << nl;
+        // }
+    }
+
+    Field<complex> fld1(3, complex(2.0, 1.0));
+
+    Info<< "Field " << flatOutput(fld1) << nl;
+
+    Info<< "sum = " << sum(fld1) << nl;
+    // Not yet Info<< "min = " << min(fld1) << nl;
+
+    fld1 *= 10;
+    Info<< "Multiply: " << flatOutput(fld1) << nl;
+
+    for (complex& c : fld1)
+    {
+        c = ~c;
+    }
+
+    Info<< "Conjugate: " << flatOutput(fld1) << nl;
+
+    Info<< "\nEnd\n" << endl;
+    return 0;
+}
+
+// ************************************************************************* //