/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
     \\/     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/>.

\*---------------------------------------------------------------------------*/

#include "label.H"
#include "error.H"

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

#if WM_LABEL_SIZE == 32
const char* const Foam::pTraits<int64_t>::typeName = "int64";
const char* const Foam::pTraits<int32_t>::typeName = "label";
#elif WM_LABEL_SIZE == 64
const char* const Foam::pTraits<int64_t>::typeName = "label";
const char* const Foam::pTraits<int32_t>::typeName = "int32";
#endif


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

Foam::label Foam::pow(label a, label b)
{
    label ans = 1;
    for (label i=0; i<b; i++)
    {
        ans *= a;
    }

    #ifdef FULLDEBUG
    if (b < 0)
    {
        FatalErrorInFunction
            << "negative value for b is not supported"
            << abort(FatalError);
    }
    #endif

    return ans;
}


Foam::label Foam::factorial(label n)
{
    static label factTable[13] =
    {
        1, 1, 2, 6, 24, 120, 720, 5040, 40320,
        362880, 3628800, 39916800, 479001600
    };

    #ifdef FULLDEBUG
    if (n > 12 || n < 0)
    {
        FatalErrorInFunction
            << "n value out of range"
            << abort(FatalError);
    }
    #endif

    return factTable[n];
}


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