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values-inter.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, 2008
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 
00042   template<class I, class J>
00043   class Inter  {
00044   protected:
00046     I i;
00048     J j;
00050     void next(void);
00051   public:
00053 
00054 
00055     Inter(void);
00057     Inter(I& i, J& j);
00059     void init(I& i, J& j);
00061 
00063 
00064 
00065     bool operator ()(void) const;
00067     void operator ++(void);
00069 
00071 
00072 
00073     int val(void) const;
00075   };
00076 
00077 
00078   template<class I, class J>
00079   forceinline
00080   Inter<I,J>::Inter(void) {}
00081 
00082   template<class I, class J>
00083   forceinline void
00084   Inter<I,J>::next(void) {
00085     do {
00086       while (i() && j() && (i.val() < j.val()))
00087         ++i;
00088       while (i() && j() && (j.val() < i.val()))
00089         ++j;
00090     } while (i() && j() && (i.val() != j.val()));
00091   }
00092 
00093   template<class I, class J>
00094   inline void
00095   Inter<I,J>::init(I& i0, J& j0) {
00096     i=i0; j=j0; next();
00097   }
00098 
00099   template<class I, class J>
00100   forceinline
00101   Inter<I,J>::Inter(I& i0, J& j0) : i(i0), j(j0) {
00102     next();
00103   }
00104 
00105   template<class I, class J>
00106   forceinline void
00107   Inter<I,J>::operator ++(void) {
00108     ++i; ++j; next();
00109   }
00110 
00111   template<class I, class J>
00112   forceinline bool
00113   Inter<I,J>::operator ()(void) const {
00114     return i() && j();
00115   }
00116 
00117   template<class I, class J>
00118   forceinline int
00119   Inter<I,J>::val(void) const {
00120     assert(i.val() == j.val());
00121     return i.val();
00122   }
00123 
00124 }}}
00125 
00126 // STATISTICS: iter-any