ENH: added constant predicates

- predicates::always and predicates::never returning true and false, respectively. These simple classes make it easier when writing templated code. As well as unary and binary predicate forms, they also contain a match(std::string) method for compatibility with regex-based classes. STYLE: write bool and direction as primitive 'int' not as 'label'.
2025-11-28 03:28:01 +00:00 · 2017-05-17 10:18:14 +02:00
parent a8d2ebf298
commit 8d018e7950
11 changed files with 291 additions and 38 deletions
--- a/applications/test/predicates/Test-predicates.C
+++ b/applications/test/predicates/Test-predicates.C
@ -0,0 +1,112 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2017 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
+    Test-predicates
+
+Description
+    Simple tests using predicates
+
+\*---------------------------------------------------------------------------*/
+
+#include "IOstreams.H"
+#include "labelList.H"
+#include "wordList.H"
+#include "predicates.H"
+#include "FlatOutput.H"
+#include "regExp.H"
+
+using namespace Foam;
+
+
+template<class ListType, class UnaryPredicate>
+label printMatching(const ListType& list, const UnaryPredicate& pred)
+{
+    label count = 0;
+
+    Info<< "(";
+
+    for (const auto& val : list)
+    {
+        if (pred(val))
+        {
+            if (count) Info<< ' ';
+            Info<< val;
+            ++count;
+        }
+    }
+
+    Info<< ") => " << count << nl;
+
+    return count;
+}
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+//  Main program:
+
+int main(int argc, char *argv[])
+{
+    wordList words
+    {
+        "abc",
+        "def",
+        "hij",
+        "abc_",
+        "def_",
+        "hij_",
+    };
+
+    labelRange range(-10, 40);
+    labelList values(range.begin(), range.end());
+
+    Info<<"words:  " << flatOutput(words) << endl;
+    Info<<"values: " << flatOutput(values)  << endl;
+
+    regExp matcher(".*_.*");
+
+    Info<<"With '_': ";
+    printMatching(words, matcher);
+
+    Info<<"All: ";
+    printMatching(words, predicates::always());
+
+    Info<<"None: ";
+    printMatching(words, predicates::never());
+
+    Info<<"Neg values: ";
+    printMatching(values, [](const label v) { return v < 0; });
+
+    Info<<"Even values: ";
+    printMatching(values, [](const label v) { return !(v % 2); });
+
+    Info<<"All: ";
+    printMatching(values, predicates::always());
+
+    Info<<"None: ";
+    printMatching(values, predicates::never());
+
+    return 0;
+}
+
+// ************************************************************************* //