objectHit.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011 OpenFOAM Foundation
    Copyright (C) 2017-2020 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::objectHit
 
Description
    This class describes a combination of target object index and success flag.
    Behaves somewhat like std::optional
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_objectHit_H
#define Foam_objectHit_H
 
#include "bool.H"
#include "label.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class objectHit;
inline Ostream& operator<<(Ostream& os, const objectHit& obj);
 
/*---------------------------------------------------------------------------*\
                           Class objectHit Declaration
\*---------------------------------------------------------------------------*/
 
class objectHit
{
    // Private Data
 
        //- Hit success
        bool hit_;
 
        //- The hit object index
        label index_;
 
 
public:
 
    // Constructors
 
        //- Default construct. Nothing hit and object index = -1
        constexpr objectHit() noexcept
        :
            hit_(false),
            index_(-1)
        {}
 
        //- Construct from components
        objectHit(const bool success, const label index) noexcept
        :
            hit_(success),
            index_(index)
        {}
 
        //- Construct from Istream
        explicit objectHit(Istream& is)
        :
            hit_(readBool(is)),
            index_(readLabel(is))
        {}
 
 
    // Member Functions
 
    // Access
 
        //- Is there a hit?
        bool hit() const noexcept
        {
            return hit_;
        }
 
        //- Return the hit object index
        label index() const noexcept
        {
            return index_;
        }
 
        //- Identical to index()
        label hitObject() const noexcept
        {
            return index_;
        }
 
 
    // Edit
 
        //- Reset to default construct state (false, -1)
        void reset() noexcept
        {
            hit_ = false;
            index_ = -1;
        }
 
        //- Set the hit status \em on
        void setHit() noexcept
        {
            hit_ = true;
        }
 
        //- Set the hit status \em off
        void setMiss() noexcept
        {
            hit_ = false;
        }
 
        //- Set the hit object index
        void setIndex(const label index) noexcept
        {
            index_ = index;
        }
 
 
    // Ostream Operator
 
        inline friend Ostream& operator<<(Ostream& os, const objectHit& obj)
        {
             return os << obj.hit() << token::SPACE << obj.index();
        }
};
 
 
// * * * * * * * * * * * * * * Global Operators  * * * * * * * * * * * * * * //
 
inline bool operator==(const objectHit& a, const objectHit& b)
{
    return a.hit() == b.hit() && a.index() == b.index();
}
 
 
inline bool operator!=(const objectHit& a, const objectHit& b)
{
    return !(a == b);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //