autoPtr.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
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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
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    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::autoPtr

Description
    An auto-pointer similar to the STL auto_ptr but with automatic casting
    to a reference to the type and with pointer allocation checking on access.

SourceFiles
    autoPtrI.H

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

#ifndef autoPtr_H
#define autoPtr_H

#include <cstddef>

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class autoPtr Declaration
\*---------------------------------------------------------------------------*/

template<class T>
class autoPtr
{
    // Public data

        //- Pointer to object
        mutable T* ptr_;


public:

    // Constructors

        //- Store object pointer
        inline explicit autoPtr(T* = 0);

        //- Construct as copy by transfering pointer to this autoPtr and
        //  setting the arguments pointer to NULL
        inline autoPtr(const autoPtr<T>&);


    // Destructor

        //- Delete object if pointer is not NULL
        inline ~autoPtr();


    // Member Functions

    // Check

        //- Return true if the autoPtr is empty (ie, no pointer set).
        inline bool empty() const;

        //- Return true if the autoPtr valid (ie, the pointer is set).
        inline bool valid() const;


    // Edit

        //- Return object pointer for reuse
        inline T* ptr();

        //- Set pointer to that given.
        //  If object pointer already set issue a FatalError.
        inline void set(T*);

        //- If object pointer already set, delete object and set to given pointer
        inline void reset(T* = 0);

        //- Delete object and set pointer to NULL, if the pointer is valid.
        inline void clear();


    // Member operators

        //- Return reference to the object data
        inline T& operator()();

        //- Return const reference to the object data
        inline const T& operator()() const;

        // inline T& operator*();
        // inline const T& operator*() const;

        inline operator const T&() const;

        //- Return object pointer
        inline T* operator->();

        //- Return const object pointer
        inline const T* operator->() const;

        //- Take over object pointer from parameter
        inline void operator=(const autoPtr<T>&);
};


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

} // End namespace Foam

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

#include "autoPtrI.H"

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

#endif

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