oneOrTmp.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
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    You should have received a copy of the GNU General Public License
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Class
    Foam::oneOrTmp
 
Description
    Variant type that either contains and behaves as tmp object or represents a
    value of one. Provides multiplication and scaling operations which are
    optimised away if representing a value of one.
 
SourceFiles
    oneOrTmpI.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef oneOrTmp_H
#define oneOrTmp_H
 
#include "one.H"
#include "tmp.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                          Class oneOrTmp Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class oneOrTmp
{
    // Private Data
 
        //- Is this a value of one?
        bool isOne_;
 
        //- Temporary object
        tmp<Type> tt_;
 
 
public:
 
    // Constructors
 
        //- Construct as one
        inline oneOrTmp();
 
        //- Construct from an object
        inline oneOrTmp(const Type&);
 
        //- Construct from a temporary object
        inline oneOrTmp(const tmp<Type>&);
 
        //- Copy construct
        inline oneOrTmp(const oneOrTmp<Type>&);
 
 
    //- Destructor
    ~oneOrTmp();
 
 
    // Member Functions
 
        //- Scale an object by this value
        template<class Other>
        void scale(Other& o) const;
 
 
    // Member Operators
 
        //- Assign to one
        inline void operator=(const one&);
 
        //- Assign to a temporary object
        inline void operator=(const tmp<Type>&);
 
        //- Return an instance of the class which refers to this one. Used in
        //  the same way as tmp::operator() to prevent the tmp being consumed.
        inline oneOrTmp<Type> operator()() const;
 
        //- Multiply with an object
        template<class Other>
        inline tmp<Other> operator*(const Other&);
 
        //- Multiply with a temporary object
        template<class Other>
        inline tmp<Other> operator*(const tmp<Other>&);
 
        //- Disallow default bitwise assignment
        void operator=(const oneOrTmp<Type>&) = delete;
};
 
 
// Global Operators
 
//- Multiply with an object
template<class Type, class Other>
inline tmp<Other> operator*(const Other&, const oneOrTmp<Type>&);
 
//- Multiply with a temporary object
template<class Type, class Other>
inline tmp<Other> operator*(const tmp<Other>&, const oneOrTmp<Type>&);
 
//- Multiply-assign with an object
template<class Type, class Other>
inline void operator*=(Other&, const oneOrTmp<Type>&);
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "oneOrTmpI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //