| 1 | // -*- C++ -*-
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| 2 | ///////////////////////////////////////////////////////////////////////////////
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| 3 | // File: circulator.h //
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| 4 | // Description: header file for circulator (circulator class) //
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| 5 | // This file is part of the SISCone project. //
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| 6 | // For more details, see http://projects.hepforge.org/siscone //
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| 7 | // //
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| 8 | // Copyright (c) 2006 Gavin Salam and Gregory Soyez //
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| 9 | // //
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| 10 | // This program is free software; you can redistribute it and/or modify //
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| 11 | // it under the terms of the GNU General Public License as published by //
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| 12 | // the Free Software Foundation; either version 2 of the License, or //
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| 13 | // (at your option) any later version. //
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| 14 | // //
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| 15 | // This program is distributed in the hope that it will be useful, //
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| 16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of //
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| 17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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| 18 | // GNU General Public License for more details. //
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| 19 | // //
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| 20 | // You should have received a copy of the GNU General Public License //
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| 21 | // along with this program; if not, write to the Free Software //
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| 22 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
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| 23 | // //
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| 24 | // $Revision: 1.1 $//
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| 25 | // $Date: 2008-11-06 14:32:11 $//
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| 26 | ///////////////////////////////////////////////////////////////////////////////
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| 27 |
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| 28 | #ifndef __CIRCULATOR_H__
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| 29 | #define __CIRCULATOR_H__
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| 30 |
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| 31 | namespace siscone{
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| 32 |
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| 33 | /// a circulator that is foreseen to take as template member either a
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| 34 | /// pointer or an iterator;
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| 35 | template<class T> class circulator {
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| 36 |
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| 37 | public:
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| 38 | inline circulator(T here, T begin, T end) : m_here(here), m_begin(begin), m_end(end) {}
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| 39 |
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| 40 | inline circulator(const circulator<T> & other) : m_here(other.m_here), m_begin(other.m_begin), m_end(other.m_end) {}
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| 41 |
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| 42 | /// set just the position without resetting the begin and end elements
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| 43 | void set_position(const circulator<T> & other) {m_here = other.m_here;}
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| 44 | void set_position(T pointer) {m_here = pointer;}
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| 45 |
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| 46 | T operator()() {return m_here;}
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| 47 |
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| 48 | inline circulator<T> & operator++() {
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| 49 | ++m_here;
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| 50 | if (m_here == m_end) m_here = m_begin;
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| 51 | return *this;
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| 52 | }
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| 53 |
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| 54 | inline circulator<T> & operator--() {
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| 55 | if (m_here == m_begin) m_here = m_end;
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| 56 | --m_here;
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| 57 | return *this;
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| 58 | }
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| 59 |
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| 60 | /// NB: for efficiency, this checks only the here element
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| 61 | bool operator==(const circulator & other) const {return m_here == other.m_here;}
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| 62 | /// NB: for efficiency, this checks only the here element
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| 63 | bool operator!=(const circulator & other) const {return m_here != other.m_here;}
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| 64 |
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| 65 | private:
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| 66 | T m_here, m_begin, m_end;
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| 67 | };
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| 68 |
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| 69 | }
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| 70 |
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| 71 | #endif // __CIRCULATOR_H__
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