Constant.H

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License
    This file is part of OpenFOAM.

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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
        Type value_;


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 dictionary& dict);

        //- Construct from name and Istream
        //  Reads the constant value without the Function1 type
        //  for backward compatibility
        Constant(const word& name, 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;

        //- Write in dictionary format
        virtual void write(Ostream& os) 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

// ************************************************************************* //