labelBits.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2022 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/>.
 
Class
    Foam::labelBits
 
Description
    A 29bits (or 61bits) integer label with 3bits direction
    (eg, octant) packed into single label
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_labelBits_H
#define Foam_labelBits_H
 
#include "label.H"
#include "direction.H"
#include "error.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class labelBits;
 
/*---------------------------------------------------------------------------*\
                          Class labelBits Declaration
\*---------------------------------------------------------------------------*/
 
class labelBits
{
    // Private Data
 
        //- Integer value and (octant) direction
        label data_;
 
public:
 
    // Static Functions
 
        #ifdef FULLDEBUG
 
        //- Pack integer value and bits (octant) into a label
        inline static label pack
        (
            const label val,
            const direction bits
        )
        {
            if (bits > 7 || (((val<<3)>>3) != val))
            {
                FatalErrorInFunction
                    << "Direction " << bits << " outside range 0..7"
                    << " or value " << val << " negative or larger than "
                    << label(8*sizeof(label)-3) << " bit representation"
                    << abort(FatalError);
            }
            return (val<<3) | bits;
        }
 
        #else
 
        //- Pack integer value and bits (octant) into a label
        static constexpr label pack
        (
            const label val,
            const direction bits
        ) noexcept
        {
            return (val<<3) | bits;
        }
 
        #endif
 
 
    // Constructors
 
        //- Default construct as zero initialized
        constexpr labelBits() noexcept
        :
             data_(0)
        {}
 
        //- Construct from components
        labelBits(const label val, const direction bits)
        :
             data_(pack(val, bits))
        {}
 
        //- Read construct from Istream
        explicit labelBits(Istream& is)
        {
            is >> data_;
        }
 
 
    // Member Functions
 
        //- The raw data value
        label data() const noexcept { return data_; }
 
        //- Return the integer value
        label val() const noexcept { return (data_ >> 3); }
 
        //- Return the octant direction
        direction bits() const noexcept { return (data_ & 7); }
 
        //- Set the integer value
        void setVal(const label val)
        {
            data_ = pack(val, bits());
        }
 
        //- Set the octant direction
        void setBits(const direction bits)
        {
            data_ = pack(val(), bits);
        }
 
 
    // Member Operators
 
        inline friend
        bool operator==(const labelBits& a, const labelBits& b)
        {
            return a.data_ == b.data_;
        }
 
        inline friend
        bool operator!=(const labelBits& a, const labelBits& b)
        {
            return !(a == b);
        }
 
 
    // IOstream Operators
 
        inline friend
        Istream& operator>>(Istream& is, labelBits& rhs)
        {
            return is >> rhs.data_;
        }
 
        inline friend
        Ostream& operator<<(Ostream& os, const labelBits& rhs)
        {
            return os << rhs.data_;
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //