tmp.H

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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::tmp
 
Description
    A class for managing temporary objects
 
SourceFiles
    tmpI.H
 
See also
    Foam::refCount
    Foam::autoPtr
 
\*---------------------------------------------------------------------------*/
 
#ifndef tmp_H
#define tmp_H
 
#include "refCount.H"
#include "word.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                             Class tmp Declaration
\*---------------------------------------------------------------------------*/
 
template<class T>
class tmp
{
    // Private Data
 
        //- Object types
        enum type
        {
            REUSABLE_TMP,
            NON_RESUSABLE_TMP,
            CONST_REF
        };
 
        //- Type of object
        type type_;
 
        //- Pointer to object
        mutable T* ptr_;
 
 
    // Private member operators
 
        //- Return true if the object is a reusable or non-reusable temporary
        inline bool isAnyTmp() const;
 
        inline void operator++();
 
 
public:
 
    typedef T Type;
    typedef Foam::refCount refCount;
 
 
    // Constructors
 
        //- Store object pointer of a non-reusable or reusable temporary object
        inline explicit tmp(T* = 0, bool nonReusable = false);
 
        //- Store object const reference
        inline tmp(const T&);
 
        //- Construct copy and increment reference count
        inline tmp(const tmp<T>&);
 
        //- Construct copy moving content, does not increment reference count
        inline tmp(const tmp<T>&&);
 
        //- Construct copy transferring content of temporary if required
        inline tmp(const tmp<T>&, bool allowTransfer);
 
 
    //- Destructor: deletes temporary object when the reference count is 0
    inline ~tmp();
 
 
    // Member Functions
 
        // Access
 
            //- Return true if this is really a temporary object
            inline bool isTmp() const;
 
            //- Return true if this temporary object empty,
            //  ie, a temporary without allocation
            inline bool empty() const;
 
            //- Is this temporary object valid,
            //  ie, it is a reference or a temporary that has been allocated
            inline bool valid() const;
 
            //- Return the type name of the tmp
            //  constructed from the type name of T
            inline word typeName() const;
 
 
        // Edit
 
            //- Return non-const reference or generate a fatal error
            //  if the object is const.
            inline T& ref() const;
 
            //- Return tmp pointer for reuse.
            //  Returns a clone if the object is not a temporary
            inline T* ptr() const;
 
            //- If object pointer points to valid object:
            //  delete object and set pointer to nullptr
            inline void clear() const;
 
 
    // Member Operators
 
        #ifdef NON_CONST_TMP
        //- Deprecated non-const dereference operator.
        //  Use ref() where non-const access is required
        inline T& operator()();
        #endif
 
        //- Const dereference operator
        inline const T& operator()() const;
 
        //- Const cast to the underlying type reference
        inline operator const T&() const;
 
        //- Return object pointer
        inline T* operator->();
 
        //- Return const object pointer
        inline const T* operator->() const;
 
        //- Assignment to pointer changing this tmp to a temporary T
        inline void operator=(T*);
 
        //- Assignment transferring the temporary T to this tmp
        inline void operator=(const tmp<T>&);
 
        //- Move assignment transferring the temporary T to this tmp
        inline void operator=(const tmp<T>&&);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "tmpI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //