phasePairKey.H

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    Copyright (C) 2014-2016 OpenFOAM Foundation
    Copyright (C) 2017-2021 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.
 
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    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
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Class
    Foam::phasePairKey
 
Description
    An ordered or unorder pair of phase names.
    Typically specified as follows.
    \verbatim
       (phase1 and phase2)  // unordered
       (phase1 to  phase2)  // ordered
    \endverbatim
 
SourceFiles
    phasePairKey.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef phasePairKey_H
#define phasePairKey_H
 
#include "Pair.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward Declarations
class phasePairKey;
 
bool operator==(const phasePairKey& a, const phasePairKey& b);
bool operator!=(const phasePairKey& a, const phasePairKey& b);
 
Istream& operator>>(Istream& is, phasePairKey& key);
Ostream& operator<<(Ostream& os, const phasePairKey& key);
 
/*---------------------------------------------------------------------------*\
                         Class phasePairKey Declaration
\*---------------------------------------------------------------------------*/
 
class phasePairKey
:
    public Pair<word>
{
    // Private Data
 
        //- Flag to indicate whether ordering is important
        bool ordered_;
 
 
public:
 
    // Constructors
 
        //- Default construct
        phasePairKey() = default;
 
        //- Construct from names and (optional) ordering flag
        phasePairKey
        (
            const word& name1,
            const word& name2,
            const bool ordered = false
        );
 
 
    //- Destructor
    virtual ~phasePairKey() = default;
 
 
    // Member Functions
 
        //- Return the ordered flag
        bool ordered() const noexcept
        {
            return ordered_;
        }
 
 
    // Friend Operators
 
        //- Test for equality
        friend bool operator==(const phasePairKey& a, const phasePairKey& b);
 
        //- Test for inequality
        friend bool operator!=(const phasePairKey& a, const phasePairKey& b);
 
        //- Read from Istream
        friend Istream& operator>>(Istream& is, phasePairKey& key);
 
        //- Write to Ostream
        friend Ostream& operator<<(Ostream& os, const phasePairKey& key);
 
 
    // Hashing
 
        //- Hashing functor for phasePairKey
        struct hasher
        {
            unsigned operator()(const phasePairKey& key) const
            {
                if (key.ordered())
                {
                    return Pair<word>::hasher()(key);
                }
                else
                {
                    return Pair<word>::symmHasher()(key);
                }
            }
        };
 
        //- Alternative name for functor
        using hash = phasePairKey::hasher;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
//- Hashing for phasePairKey
template<> struct Hash<phasePairKey> : phasePairKey::hasher {};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //