labelRange.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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::labelRange
 
Description
    A label range specifier.
 
SourceFiles
    labelRange.C
 
\*---------------------------------------------------------------------------*/
#ifndef labelRange_H
#define labelRange_H
 
#include "label.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of classes
class Istream;
class Ostream;
 
// Forward declaration of friend functions and operators
class labelRange;
Istream& operator>>(Istream&, labelRange&);
Ostream& operator<<(Ostream&, const labelRange&);
 
/*---------------------------------------------------------------------------*\
                         Class labelRange Declaration
\*---------------------------------------------------------------------------*/
 
class labelRange
{
    // Private data
 
        label start_;
        label size_;
 
public:
 
        static int debug;
 
 
    // Public classes
 
        //- Less function class for sorting labelRange
        class less
        {
        public:
 
            bool operator()(const labelRange& a, const labelRange& b)
            {
                return a.first() < b.first();
            }
        };
 
    // Constructors
 
        //- Construct an empty range
        inline labelRange();
 
        //- Construct a range
        //  A negative size is autmatically changed to zero.
        inline labelRange(const label start, const label size);
 
        //- Construct from Istream.
        labelRange(Istream&);
 
 
    // Member Functions
 
        //- Reset to zero size
        inline void clear();
 
        //- Is the range empty?
        inline bool empty() const;
 
        //- Return the effective size of the range
        inline label size() const;
 
        //- The (inclusive) lower value of the range
        inline label first() const;
 
        //- The (inclusive) upper value of the range
        inline label last() const;
 
        //- Return true if the value is within the range
        inline bool contains(const label) const;
 
        //- Return true if the ranges intersect
        //  Optional test for ranges that also just touch each other
        bool intersects(const labelRange&, const bool touches = false) const;
 
        //- Return a joined range, squashing any gaps in between
        //  A prior intersects() check can be used to avoid squashing gaps.
        labelRange join(const labelRange&) const;
 
 
    // Member Operators
 
        //- Return element in range, no bounds checking
        inline label operator[](const label) const;
 
        //- Comparison function for sorting, compares the start
        inline bool operator<(const labelRange& rhs) const;
 
        //- Join ranges, squashing any gaps in between
        //  A prior intersects() check can be used to avoid squashing gaps.
        labelRange& operator+=(const labelRange&);
 
        inline bool operator==(const labelRange&) const;
        inline bool operator!=(const labelRange&) const;
 
 
    // STL iterator
 
        //- An STL const_iterator
        class const_iterator
        {
            // Private data
 
                //- Reference to the range for which this is an iterator
                const labelRange& range_;
 
                //- Current index
                label index_;
 
        public:
 
            // Constructors
 
                //- Construct null - equivalent to an 'end' position
                inline const_iterator();
 
                //- Construct from range, moving to its 'begin' position
                inline explicit const_iterator(const labelRange&);
 
 
            // Member operators
 
                inline bool operator==(const const_iterator&) const;
 
                inline bool operator!=(const const_iterator&) const;
 
                inline label operator*();
                inline label operator()();
 
                inline const_iterator& operator++();
                inline const_iterator operator++(int);
        };
 
 
        //- const_iterator set to the beginning of the range
        inline const_iterator cbegin() const;
 
        //- const_iterator set to beyond the end of the range
        inline const const_iterator& cend() const;
 
        //- const_iterator set to the beginning of the range
        inline const_iterator begin() const;
 
        //- const_iterator set to beyond the end of the range
        inline const const_iterator& end() const;
 
 
    // IOstream Operators
 
        friend Istream& operator>>(Istream&, labelRange&);
        friend Ostream& operator<<(Ostream&, const labelRange&);
 
 
private:
 
        //- const_iterator returned by end(), cend()
        static const const_iterator endIter_;
 
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "labelRangeI.H"
 
#endif
 
// ************************************************************************* //