UPtrList.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::UPtrList
 
Description
    A templated 1D list of pointers to objects of type <T>, where the
    size of the array is known and used for subscript bounds checking, etc.
 
    The element operator [] returns a reference to the object rather than a
    pointer.  Storage is not allocated during construction or use but is
    supplied to the constructor as an argument.
 
SourceFiles
    UPtrList.C
    UPtrListIO.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef UPtrList_H
#define UPtrList_H
 
#include "List.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of friend classes
template<class T> class PtrList;
 
// Forward declaration of friend functions and operators
template<class T> class UPtrList;
template<class T> void writeEntry(Ostream& os, const UPtrList<T>&);
template<class T> Istream& operator>>(Istream&, UPtrList<T>&);
template<class T> Ostream& operator<<(Ostream&, const UPtrList<T>&);
 
 
/*---------------------------------------------------------------------------*\
                          Class UPtrList Declaration
\*---------------------------------------------------------------------------*/
 
template<class T>
class UPtrList
{
    // Private Data
 
        List<T*> ptrs_;
 
 
public:
 
    // Related types
 
        //- Declare friendship with the PtrList class
        friend class PtrList<T>;
 
 
    // Constructors
 
        //- Null Constructor
        UPtrList();
 
        //- Construct with size specified
        explicit UPtrList(const label);
 
        //- Construct as copy or re-use as specified
        UPtrList(UPtrList<T>&, bool reuse);
 
 
    // Member Functions
 
        // Access
 
            //- Return the number of elements in the UPtrList
            inline label size() const;
 
            //- Return true if the UPtrList is empty (ie, size() is zero)
            inline bool empty() const;
 
            //- Return reference to the first element of the list
            inline T& first();
 
            //- Return reference to first element of the list
            inline const T& first() const;
 
            //- Return reference to the last element of the list
            inline T& last();
 
            //- Return reference to the last element of the list
            inline const T& last() const;
 
 
        // Edit
 
            //- Reset size of UPtrList.  This can only be used to set the size
            //  of an empty UPtrList, extend a UPtrList, remove entries from
            //  the end of a UPtrList
            void setSize(const label);
 
            //- Reset size of UPtrList.  This can only be used to set the size
            //  of an empty UPtrList, extend a UPtrList, remove entries from
            //  the end of a UPtrList
            inline void resize(const label);
 
            //- Clear the UPtrList, i.e. set size to zero
            void clear();
 
            //- Transfer the contents of the argument UPtrList into this
            //  UPtrList and annul the argument list
            void transfer(UPtrList<T>&);
 
            //- Is element set
            inline bool set(const label) const;
 
            //- Set element. Return old element (can be nullptr).
            //  No checks on new element
            inline T* set(const label, T*);
 
            //- Reorders elements. Ordering does not have to be done in
            //  ascending or descending order. Reordering has to be unique.
            //  (is shuffle)
            void reorder(const labelUList& oldToNew);
 
            //- Reorders elements. Ordering does not have to be done in
            //  ascending or descending order. Reordering has to be unique.
            //  Note: can create unset elements
            void shuffle(const labelUList& newToOld);
 
 
        // Conversion
 
            //- Convert to list of different pointer type
            template<class T2>
            UPtrList<T2> convert();
 
            //- Convert to list of different pointer type
            template<class T2>
            UPtrList<const T2> convert() const;
 
 
    // Member Operators
 
        //- Return element const reference
        inline const T& operator[](const label) const;
 
        //- Return element reference
        inline T& operator[](const label);
 
        //- Return element const pointer
        inline const T* operator()(const label) const;
 
        //- Return element const pointer
        inline T* operator()(const label);
 
 
    // STL type definitions
 
        //- Type of values the UPtrList contains
        typedef T value_type;
 
        //- Type that can be used for storing into UPtrList::value_type objects
        typedef T& reference;
 
        //- Type that can be used for storing into constant UPtrList::value_type
        //  objects
        typedef const T& const_reference;
 
 
    // STL iterator
    // Random access iterator for traversing UPtrList
 
        class iterator;
        class const_iterator;
        friend class iterator;
 
        //- An STL iterator
        class iterator
        {
            T** ptr_;
 
        public:
 
            friend class const_iterator;
 
            //- Construct for a given UPtrList entry
            inline iterator(T**);
 
            // Member Operators
 
                inline bool operator==(const iterator&) const;
                inline bool operator!=(const iterator&) const;
 
                inline T& operator*();
                inline T& operator()();
 
                inline iterator operator++();
                inline iterator operator++(const int);
 
                inline iterator operator--();
                inline iterator operator--(const int);
 
                inline iterator operator+=(const label);
                inline iterator operator-=(const label);
 
                inline iterator operator+(const label) const;
                inline iterator operator-(const label) const;
 
                inline label operator-(const iterator&) const;
 
                inline T& operator[](const label);
 
                inline bool operator<(const iterator&) const;
                inline bool operator>(const iterator&) const;
 
                inline bool operator<=(const iterator&) const;
                inline bool operator>=(const iterator&) const;
        };
 
        //- Return an iterator to begin traversing the UPtrList
        inline iterator begin();
 
        //- Return an iterator to end traversing the UPtrList
        inline iterator end();
 
 
    // STL const_iterator
    // Random access iterator for traversing UPtrList
 
        //- An STL-conforming const_iterator
        class const_iterator
        {
            const T* const* ptr_;
 
        public:
 
            //- Construct for a given UPtrList entry
            inline const_iterator(const T* const*);
 
            //- Construct from an iterator
            inline const_iterator(const iterator&);
 
 
            // Member Operators
 
                inline bool operator==(const const_iterator&) const;
                inline bool operator!=(const const_iterator&) const;
 
                typedef const T& Tref;
                inline Tref operator*();
                inline Tref operator()();
 
                inline const_iterator operator++();
                inline const_iterator operator++(const int);
 
                inline const_iterator operator--();
                inline const_iterator operator--(const int);
 
                inline const_iterator operator+=(const label);
                inline const_iterator operator-=(const label);
 
                inline const_iterator operator+(const label) const;
                inline const_iterator operator-(const label) const;
 
                inline label operator-(const const_iterator&) const;
 
                inline const T& operator[](const label);
 
                inline bool operator<(const const_iterator&) const;
                inline bool operator>(const const_iterator&) const;
 
                inline bool operator<=(const const_iterator&) const;
                inline bool operator>=(const const_iterator&) const;
        };
 
        //- Return an const_iterator to begin traversing the UPtrList
        inline const_iterator cbegin() const;
 
        //- Return an const_iterator to end traversing the UPtrList
        inline const_iterator cend() const;
 
        //- Return an const_iterator to begin traversing the UPtrList
        inline const_iterator begin() const;
 
        //- Return an const_iterator to end traversing the UPtrList
        inline const_iterator end() const;
 
 
    // IOstream operator
 
        //- Write UPtrList to Ostream
        friend Ostream& operator<< <T>(Ostream&, const UPtrList<T>&);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "UPtrListI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "UPtrList.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //