SubField.H

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/*---------------------------------------------------------------------------*\
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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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Class
    Foam::SubField

Description
    SubField is a Field obtained as a section of another Field.

    Thus it is itself unallocated so that no storage is allocated or
    deallocated during its use.  To achieve this behaviour, SubField is
    derived from a SubList rather than a List.

SourceFiles
    SubFieldI.H

\*---------------------------------------------------------------------------*/

#ifndef SubField_H
#define SubField_H

#include <OpenFOAM/SubList.H>
#include "Field.H"

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

namespace Foam
{

//- Pre-declare SubField and related Field type
template<class Type> class Field;
template<class Type> class SubField;

/*---------------------------------------------------------------------------*\
                           Class SubField Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class SubField
:
    public refCount,
    public SubList<Type>
{

public:

    //- Component type
    typedef typename pTraits<Type>::cmptType cmptType;


    // Constructors

        //- Construct from a SubList
        inline SubField(const SubList<Type>&);

        //- Construct from a UList<Type>, using the entire size
        explicit inline SubField(const UList<Type>&);

        //- Construct from a UList<Type> with a given size
        inline SubField
        (
            const UList<Type>& list,
            const label subSize
        );

        //- Construct from a UList<Type> with a given size and start index
        inline SubField
        (
            const UList<Type>& list,
            const label subSize,
            const label startIndex
        );

        //- Construct as copy
        inline SubField(const SubField<Type>&);


    // Member functions

        //- Return a null SubField
        static inline const SubField<Type>& null();

        //- Return a component field of the field
        inline tmp<Field<cmptType> > component(const direction) const;

        //- Return the field transpose (only defined for second rank tensors)
        tmp<Field<Type> > T() const;


    // Member operators

        //- Assignment via UList operator. Takes linear time.
        inline void operator=(const SubField<Type>&);

        //- Allow cast to a const Field<Type>&
        inline operator const Field<Type>&() const;
};


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

} // End namespace Foam

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

#include "SubFieldI.H"

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

#endif

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