Test-predicates.C

/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
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    Copyright (C) 2017-2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
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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_",
    };

    labelList values(identity(40, -10));

    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;
}

// ************************************************************************* //