Constant.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
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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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::Function1s::Constant
 
Description
    Templated function that returns a constant value.
 
Usage
    For entry <name> returning the value <value>:
    \verbatim
        <name>    constant  <value>
    \endverbatim
 
SourceFiles
    Constant.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Constant_H
#define Constant_H
 
#include "Function1.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function1s
{
 
/*---------------------------------------------------------------------------*\
                          Class Constant Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class Constant
:
    public FieldFunction1<Type, Constant<Type>>
{
    // Private Data
 
        //- Constant value
        const Type value_;
 
 
    // Private Member Functions
 
        //- Read the value
        static Type readValue(const unitConversions& units, Istream& is);
 
 
public:
 
    // Runtime type information
    TypeName("constant");
 
 
    // Constructors
 
        //- Construct from name and value
        Constant(const word& name, const Type& val);
 
        //- Construct from name and dictionary
        Constant
        (
            const word& name,
            const unitConversions& units,
            const dictionary& dict
        );
 
        //- Construct from name and Istream
        Constant(const word& name, const unitConversions& units, Istream& is);
 
        //- Copy constructor
        Constant(const Constant<Type>& cnst);
 
        //- Construct and return a clone
        virtual tmp<Function1<Type>> clone() const
        {
            return tmp<Function1<Type>>(new Constant<Type>(*this));
        }
 
 
    //- Destructor
    virtual ~Constant();
 
 
    // Member Functions
 
        //- Return constant value
        virtual inline Type value(const scalar) const;
 
        //- Integrate between two values
        virtual inline Type integral(const scalar x1, const scalar x2) const;
 
        //- Is this function guaranteed to be constant?
        virtual inline bool constant() const;
 
        //- Write in dictionary format
        virtual void write(Ostream& os, const unitConversions& units) const;
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const Constant<Type>&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function1s
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "ConstantI.H"
 
#ifdef NoRepository
    #include "Constant.C"
    #include "Function1New.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //