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values-unique.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2007
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 namespace Gecode { namespace Iter { namespace Values {
00035 
00045   template<class I>
00046   class Unique {
00047   protected:
00049     I i;
00050   public:
00052 
00053 
00054     Unique(void);
00056     Unique(I& i);
00058     void init(I& i);
00060 
00062 
00063 
00064     bool operator ()(void) const;
00066     void operator ++(void);
00068 
00070 
00071 
00072     int val(void) const;
00074   };
00075 
00076   template<class I>
00077   forceinline
00078   Unique<I>::Unique(void) {}
00079 
00080   template<class I>
00081   forceinline
00082   Unique<I>::Unique(I& i0)
00083     : i(i0) {}
00084 
00085   template<class I>
00086   forceinline void
00087   Unique<I>::init(I& i0) {
00088     i = i0;
00089   }
00090 
00091   template<class I>
00092   forceinline void
00093   Unique<I>::operator ++(void) {
00094     int n=i;
00095     do {
00096       ++i;
00097     } while (i() && (i.val() == n));
00098   }
00099   template<class I>
00100   forceinline bool
00101   Unique<I>::operator ()(void) const {
00102     return i();
00103   }
00104 
00105   template<class I>
00106   forceinline int
00107   Unique<I>::val(void) const {
00108     return i.val();
00109   }
00110 
00111 }}}
00112 
00113 // STATISTICS: iter-any
00114