ENH: support construct/reset refPtr from autoPtr and unique_ptr (#1775)

- makes it easier to use in combination with various 'New' selectors,
  which mostly return an autoPtr.

ENH: add very simple FFT test

- basic sanity test that the library links properly

applications/test/fft/Allwmake

@@ -0,0 +1,15 @@
+#!/bin/sh
+cd "${0%/*}" || exit                                # Run from this directory
+. ${WM_PROJECT_DIR:?}/wmake/scripts/AllwmakeParseArguments # (error catching)
+. ${WM_PROJECT_DIR:?}/wmake/scripts/have_fftw
+
+#------------------------------------------------------------------------------
+
+if have_fftw
+then
+    wmake $targetType
+else
+    echo "==> skip test (no FFTW)"
+fi
+
+#------------------------------------------------------------------------------

applications/test/fft/Make/files

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

applications/test/fft/Make/options

@@ -0,0 +1,5 @@
+EXE_INC = \
+    -I$(LIB_SRC)/randomProcesses/lnInclude
+
+EXE_LIBS = \
+    -lrandomProcesses

applications/test/fft/Test-fft.C

@@ -0,0 +1,75 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  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, distributed under GPL-3.0-or-later.
+
+Application
+    Test-fft
+
+Description
+    Very simple fft tests
+
+\*---------------------------------------------------------------------------*/
+
+#include "argList.H"
+#include "Time.H"
+#include "fft.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+using namespace Foam;
+
+// Simple forward transform
+tmp<complexField> forward1D(const tmp<complexField>& input)
+{
+    const label len = input().size();
+
+    return fft::forwardTransform(input, List<int>({len})) / len;
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+int main(int argc, char *argv[])
+{
+    argList::noParallel();
+
+    #include "setRootCase.H"
+
+    // Simple ones - http://www.sccon.ca/sccon/fft/fft3.htm
+    {
+        complexField input(8, Zero);
+        input[0] = 1;
+
+        tmp<complexField> toutput = forward1D(input);
+
+        Info<< nl
+            << "input = " << input << nl
+            << "output = " << toutput << nl;
+    }
+
+    {
+        complexField input(8, Zero);
+        input[1] = 1;
+
+        tmp<complexField> toutput = forward1D(input);
+
+        Info<< nl
+            << "input = " << input << nl
+            << "output = " << toutput << nl;
+    }
+
+    Info<< nl << "End\n" << endl;
+
+    return 0;
+}
+
+
+// ************************************************************************* //

applications/test/refPtr/Make/files

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

applications/test/refPtr/Make/options

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

applications/test/refPtr/Test-refPtr.C

@@ -0,0 +1,93 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  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, distributed under GPL-3.0-or-later.
+
+Application
+    Test-refPtr
+
+Description
+    Tests some basic functionality of refPtr
+
+\*---------------------------------------------------------------------------*/
+
+#include "primitiveFields.H"
+#include "Switch.H"
+
+using namespace Foam;
+
+struct myScalarField : public scalarField
+{
+    using scalarField::scalarField;
+};
+
+
+template<class T>
+void printInfo(const refPtr<T>& item, const bool verbose = false)
+{
+    Info<< "refPtr valid:" << Switch::name(item.valid())
+        << " pointer:" << Switch::name(item.is_pointer())
+        << " addr: " << name(item.get())
+        << " movable:" << Switch(item.movable());
+
+    Info<< nl;
+
+    if (verbose && item.valid())
+    {
+        Info<< "content: " << item() << nl;
+    }
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+// Main program:
+
+int main()
+{
+    {
+        Info<< nl << "Construct from reference" << nl;
+
+        scalarField f2(10, Foam::sqrt(2.0));
+        printInfo(refPtr<scalarField>(f2), true);
+    }
+
+    {
+        Info<< nl << "Construct from New (is_pointer)" << nl;
+        auto tfld1 = refPtr<scalarField>::New(10, scalar(1));
+        printInfo(tfld1, true);
+
+
+        Info<< nl << "Construct from autoPtr" << nl;
+        refPtr<scalarField> tfld2(autoPtr<scalarField>::New(10, scalar(2)));
+        printInfo(tfld2, true);
+
+
+        Info<< nl << "Construct from unique_ptr" << nl;
+        std::unique_ptr<scalarField> ptr(new scalarField(10, scalar(3)));
+        refPtr<scalarField> tfld3(std::move(ptr));
+        printInfo(tfld3, true);
+
+
+        Info<< nl << "Reset from autoPtr" << nl;
+        tfld2.reset(autoPtr<scalarField>::New(3, scalar(13)));
+        printInfo(tfld2, true);
+
+
+        Info<< nl << "Reset from unique_ptr" << nl;
+        ptr.reset(new scalarField(5, scalar(15)));
+        tfld3.reset(std::move(ptr));
+        printInfo(tfld3, true);
+    }
+
+    Info<< "\nEnd" << endl;
+}
+
+
+// ************************************************************************* //

applications/test/tmp/Test-tmp.C

@@ -5,23 +5,10 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2018-2019 OpenCFD Ltd.
+    Copyright (C) 2018-2020 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/>.
+    This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
 
 Application
     Test-tmp
@@ -32,6 +19,7 @@ Description
 \*---------------------------------------------------------------------------*/
 
 #include "primitiveFields.H"
+#include "Switch.H"
 
 using namespace Foam;
 
@@ -42,18 +30,23 @@ struct myScalarField : public scalarField
 
 
 template<class T>
-void printInfo(const tmp<T>& tmpItem)
+void printInfo(const tmp<T>& item, const bool verbose = false)
 {
-    Info<< "tmp valid:" << tmpItem.valid()
-        << " isTmp:" << tmpItem.isTmp()
-        << " addr: " << name(tmpItem.get());
+    Info<< "tmp valid:" << Switch::name(item.valid())
+        << " pointer:" << Switch::name(item.is_pointer())
+        << " addr: " << name(item.get())
+        << " movable:" << Switch(item.movable());
 
-    if (tmpItem.valid())
+    if (item.valid())
     {
-        Info<< " refCount:" << tmpItem->count();
+        Info<< " refCount:" << item->count();
     }
-
     Info<< nl;
+
+    if (verbose && item.valid())
+    {
+        Info<< "content: " << item() << nl;
+    }
 }
 
 
@@ -75,24 +68,14 @@ int main()
 
     {
         auto tfld1 = tmp<scalarField>::New(20, Zero);
-
-        printInfo(tfld1);
-
-        if (tfld1.valid())
-        {
-            Info<< "tmp: " << tfld1() << nl;
-        }
+        printInfo(tfld1, true);
 
         // Hold on to the old content for a bit
 
         tmp<scalarField> tfld2 =
             tmp<scalarField>::NewFrom<myScalarField>(20, Zero);
 
-        printInfo(tfld2);
-        if (tfld2.valid())
-        {
-            Info<< "tmp: " << tfld2() << nl;
-        }
+        printInfo(tfld2, true);
 
         tfld2.clear();
 

src/OpenFOAM/memory/refPtr/refPtr.H

@@ -42,6 +42,7 @@ See also
 #ifndef refPtr_H
 #define refPtr_H
 
+#include "autoPtr.H"
 #include "tmp.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@@ -119,6 +120,12 @@ public:
         //- Construct, taking ownership of the pointer.
         inline explicit refPtr(T* p) noexcept;
 
+        //- Move construct from autoPtr, transferring ownership.
+        inline explicit refPtr(autoPtr<T>&& ptr) noexcept;
+
+        //- Move construct from unique_ptr, transferring ownership.
+        inline explicit refPtr(std::unique_ptr<T>&& ptr) noexcept;
+
         //- Construct for a const reference to an object.
         inline refPtr(const T& obj) noexcept;
 
@@ -199,6 +206,12 @@ public:
         //- Delete managed temporary object and set to new given pointer
         inline void reset(T* p = nullptr) noexcept;
 
+        //- Clear existing and transfer ownership from autoPtr.
+        void reset(autoPtr<T>&& other) noexcept { reset(other.release()); }
+
+        //- Clear existing and transfer ownership from unique_ptr
+        void reset(std::unique_ptr<T>&& other) { reset(other.release()); }
+
         //- Clear existing and transfer ownership.
         inline void reset(refPtr<T>&& other) noexcept;
 
@@ -233,7 +246,7 @@ public:
 
         //- Transfer ownership of the managed pointer.
         //  Fatal for a null managed pointer or if the object is const.
-        inline void operator=(const refPtr<T>& t);
+        inline void operator=(const refPtr<T>& other);
 
         //- Clear existing and transfer ownership.
         inline void operator=(refPtr<T>&& other) noexcept;

src/OpenFOAM/memory/refPtr/refPtrI.H

@@ -80,6 +80,20 @@ inline Foam::refPtr<T>::refPtr(T* p) noexcept
 {}
 
 
+template<class T>
+inline Foam::refPtr<T>::refPtr(autoPtr<T>&& rhs) noexcept
+:
+    refPtr<T>(rhs.release())
+{}
+
+
+template<class T>
+inline Foam::refPtr<T>::refPtr(std::unique_ptr<T>&& rhs) noexcept
+:
+    refPtr<T>(rhs.release())
+{}
+
+
 template<class T>
 inline Foam::refPtr<T>::refPtr(const T& obj) noexcept
 :