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values-negative.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, bool strict=false>
00043   class Negative {
00044   protected:
00046     I i;
00047   public:
00049 
00050 
00051     Negative(void);
00053     Negative(I& i);
00055     void init(I& i);
00057 
00059 
00060 
00061     bool operator ()(void) const;
00063     void operator ++(void);
00065 
00067 
00068 
00069     int val(void) const;
00071   };
00072 
00073 
00074   template<class I, bool strict>
00075   forceinline
00076   Negative<I,strict>::Negative(void) {}
00077 
00078   template<class I, bool strict>
00079   forceinline void
00080   Negative<I,strict>::init(I& i0) {
00081     i=i0;
00082   }
00083 
00084   template<class I, bool strict>
00085   forceinline
00086   Negative<I,strict>::Negative(I& i0) : i(i0) {}
00087 
00088   template<class I, bool strict>
00089   forceinline void
00090   Negative<I,strict>::operator ++(void) {
00091     ++i;
00092   }
00093   template<class I, bool strict>
00094   forceinline bool
00095   Negative<I,strict>::operator ()(void) const {
00096     if (strict) {
00097       return i() && (i.val() < 0);
00098     } else {
00099       return i() && (i.val() <= 0);
00100     }
00101   }
00102 
00103   template<class I, bool strict>
00104   forceinline int
00105   Negative<I,strict>::val(void) const {
00106     return i.val();
00107   }
00108 
00109 }}}
00110 
00111 // STATISTICS: iter-any
00112