uLabel.H

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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/>.

Typedef
    Foam::uLabel

Description
    A uLabel is an uint32_t or uint64_t as specified by the pre-processor macro
    WM_LABEL_SIZE.

    A readLabel function is defined so that uLabel can be constructed from
    Istream.

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

#ifndef uLabel_H
#define uLabel_H

#include "uint.H"

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

#define UINT_ADD_SIZE(x,s,y) x ## s ## y
#define UINT_ADD_DEF_SIZE(x,s,y) UINT_ADD_SIZE(x,s,y)
#define UINT_SIZE(x,y) UINT_ADD_DEF_SIZE(x,WM_LABEL_SIZE,y)

#if WM_LABEL_SIZE != 32 && WM_LABEL_SIZE != 64
    #error "uLabel.H: WM_LABEL_SIZE must be set to either 32 or 64"
#endif


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

namespace Foam
{

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

typedef UINT_SIZE(uint, _t) uLabel;

static const uLabel uLabelMax = UINT_SIZE(UINT, _MAX);

inline uLabel readULabel(Istream& is)
{
    return UINT_SIZE(readUint,) (is);
}


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

//- Raise one uLabel to the power of another
uLabel pow(uLabel a, uLabel b);

//- Evaluate n! : 0 < n <= 12
uLabel factorial(uLabel n);


inline uLabel& setComponent(uLabel& l, const direction)
{
    return l;
}

inline uLabel component(const uLabel l, const direction)
{
    return l;
}

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

} // End namespace Foam

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

#undef UINT_ADD_SIZE
#undef UINT_ADD_DEF_SIZE
#undef UINT_SIZE

#endif

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