Constant.H

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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2015 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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    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
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Class
    Foam::Function1Types::Constant
 
Description
    Templated function that returns a constant value.
 
    Usage - for entry <entryName> returning the value <value>:
    \verbatim
        <entryName>    constant  <value>
    \endverbatim
 
SourceFiles
    Constant.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Constant_H
#define Constant_H
 
#include "Function1.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function1Types
{
 
/*---------------------------------------------------------------------------*\
                           Class Constant Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class Constant
:
    public Function1<Type>
{
    // Private data
 
        //- Constant value
        Type value_;
 
 
    // Private Member Functions
 
        //- No copy assignment
        void operator=(const Constant<Type>&) = delete;
 
 
public:
 
    // Runtime type information
    TypeName("constant");
 
 
    // Constructors
 
        //- Construct from components
        Constant(const word& entryName, const Type& value);
 
        //- Construct from entry name and dictionary
        Constant(const word& entryName, const dictionary& dict);
 
        //- Construct from entry name and Istream
        //  Reads the constant value without the Function1 type
        //  for backward compatibility
        Constant(const word& entryName, Istream& is);
 
        //- Copy constructor
        explicit 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 integrate(const scalar x1, const scalar x2) const;
 
        //- Return value as a function of (scalar) independent variable
        virtual tmp<Field<Type>> value(const scalarField& x) const;
 
        //- Integrate between two (scalar) values
        virtual tmp<Field<Type>> integrate
        (
            const scalarField& x1,
            const scalarField& x2
        ) const;
 
        //- Write in dictionary format
        virtual void writeData(Ostream& os) const;
};
 
 
template<>
tmp<Field<label>> Function1Types::Constant<label>::integrate
(
    const scalarField& x1,
    const scalarField& x2
) const;
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function1Types
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "ConstantI.H"
 
#ifdef NoRepository
    #include "Constant.C"
    #include "Function1New.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //