SubField.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
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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
    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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
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 "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
 
// ************************************************************************* //