subtract.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2016 OpenFOAM Foundation
    Copyright (C) 2020 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.
 
    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::functionObjects::subtract
 
Group
    grpFieldFunctionObjects
 
Description
    Subtracts a given list of (at least one or more) fields from a field and
    produces a new field, where the fields possess the same sizes and
    dimensions.
 
    \verbatim
        fieldResult = field1 - field2 - ... - fieldN
    \endverbatim
 
    Operands:
    \table
      Operand      | Type                          | Location
      input        | {vol,surface}<Type>Field(s) <!--
               --> | $FOAM_CASE/<time>/<inpField>s
      output file  | -                             | -
      output field | {vol,surface}<Type>Field    <!--
               --> | $FOAM_CASE/<time>/<outField>
    \endtable
 
    where \c <Type>=Scalar/Vector/SphericalTensor/SymmTensor/Tensor.
 
Usage
    Minimal example by using \c system/controlDict.functions:
    \verbatim
    subtract1
    {
        // Mandatory entries (unmodifiable)
        type            subtract;
        libs            (fieldFunctionObjects);
 
        // Mandatory (inherited) entry (runtime modifiable)
        fields          (<field1> <field2> ... <fieldN>);
 
        // Optional (inherited) entries
        ...
    }
    \endverbatim
 
    where the entries mean:
    \table
      Property     | Description                        | Type | Req'd | Dflt
      type         | Type name: subtract                | word |  yes  | -
      libs         | Library name: fieldFunctionObjects | word |  yes  | -
      fields       | Names of the operand fields        | wordList |  yes  | -
    \endtable
 
    The inherited entries are elaborated in:
     - \link functionObject.H \endlink
     - \link fieldsExpression.H \endlink
 
    Minimal example by using the \c postProcess utility:
    \verbatim
        postProcess -func "subtract(<field1>, <field2>, ..., <fieldN>)"
    \endverbatim
 
See also
    - Foam::functionObject
    - Foam::functionObjects::fieldsExpression
    - Foam::functionObjects::fvMeshFunctionObject
    - ExtendedCodeGuide::functionObjects::field::subtract
 
SourceFiles
    subtract.C
    subtractTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef functionObjects_subtract_H
#define functionObjects_subtract_H
 
#include "fieldsExpression.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace functionObjects
{
 
/*---------------------------------------------------------------------------*\
                           Class subtract Declaration
\*---------------------------------------------------------------------------*/
 
class subtract
:
    public fieldsExpression
{
    // Private Member Functions
 
        //- Subtract the list of fields of the specified type
        //- and return the result
        template<class GeoFieldType>
        tmp<GeoFieldType> calcFieldType() const;
 
        //- Subtract the list of fields and return true if successful
        virtual bool calc();
 
 
public:
 
    friend class fieldsExpression;
 
 
    //- Runtime type information
    TypeName("subtract");
 
 
    // Constructors
 
        //- Construct from Time and dictionary
        subtract
        (
            const word& name,
            const Time& runTime,
            const dictionary& dict
        );
 
        //- No copy construct
        subtract(const subtract&) = delete;
 
        //- No copy assignment
        void operator=(const subtract&) = delete;
 
 
    //- Destructor
    virtual ~subtract() = default;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace functionObjects
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "subtractTemplates.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //