demandDrivenEntry.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2013 OpenFOAM Foundation
-------------------------------------------------------------------------------
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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    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::demandDrivenEntry
 
Description
    Class for demand-driven dictionary entries
 
    Holds a reference to a dictionary, which is then queried if the value
    is requested and has not already been cached
 
SourceFiles
    demandDrivenEntry.C
    demandDrivenEntryI.H
 
\*---------------------------------------------------------------------------*/
 
#ifndef demandDrivenEntry_H
#define demandDrivenEntry_H
 
#include "dictionary.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class demandDrivenEntry Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class demandDrivenEntry
{
private:
 
    // Private data
 
        //- Reference to the dictionary
        const dictionary& dict_;
 
        //- Keyword to look up
        const word keyword_;
 
        //- Value
        mutable Type value_;
 
        //- Flag to say that the value has been stored
        mutable bool stored_;
 
 
public:
 
    //- Constructors
 
        //- Construct from dictionary and value - cannot be re-read
        demandDrivenEntry
        (
            const dictionary& dict,
            const Type& value
        );
 
 
        //- Construct from dictionary and keyword
        demandDrivenEntry
        (
            const dictionary& dict,
            const word& keyword
        );
 
 
        //- Construct from dictionary, keyword and default value
        demandDrivenEntry
        (
            const dictionary& dict,
            const word& keyword,
            const Type& defaultValue,
            const bool readIfPresent = true
        );
 
        //- Copy constructor
        demandDrivenEntry(const demandDrivenEntry& dde);
 
 
    // Public Member Functions
 
        //- Initialise
        inline void initialise() const;
 
        //- Return the value
        inline const Type& value() const;
 
        //- Set the value
        inline void setValue(const Type& value);
 
        //- Reset the demand-driven entry
        inline void reset();
};
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "demandDrivenEntryI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "demandDrivenEntry.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //