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var.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 {
00035 
00040   class Var {};
00041 
00046   template<class VarImp>
00047   class VarImpVar : public Var {
00048   protected:
00050     VarImp* x;
00052     VarImpVar(void);
00054     VarImpVar(VarImp* y);
00055   public:
00057     typedef VarImp VarImpType;
00059 
00060 
00061     VarImp* varimp(void) const;
00063     unsigned int degree(void) const;
00065     double afc(void) const;
00067 
00069 
00070 
00071     bool assigned(void) const;
00073 
00075 
00076 
00077     void update(Space& home, VarImpVar<VarImp>& y);
00079 
00081 
00082 
00083     bool same(const VarImpVar<VarImp>& y) const;
00085     bool before(const VarImpVar<VarImp>& y) const;
00087   };
00088 
00089 
00090   /*
00091    * Variable: contains a pointer to a variable implementation
00092    *
00093    */
00094   template<class VarImp>
00095   forceinline
00096   VarImpVar<VarImp>::VarImpVar(void)
00097     : x(NULL) {}
00098   template<class VarImp>
00099   forceinline
00100   VarImpVar<VarImp>::VarImpVar(VarImp* y)
00101     : x(y) {}
00102   template<class VarImp>
00103   forceinline VarImp*
00104   VarImpVar<VarImp>::varimp(void) const {
00105     return x;
00106   }
00107   template<class VarImp>
00108   forceinline unsigned int
00109   VarImpVar<VarImp>::degree(void) const {
00110     return x->degree();
00111   }
00112   template<class VarImp>
00113   forceinline double
00114   VarImpVar<VarImp>::afc(void) const {
00115     return x->afc();
00116   }
00117   template<class VarImp>
00118   forceinline bool
00119   VarImpVar<VarImp>::assigned(void) const {
00120     return x->assigned();
00121   }
00122   template<class VarImp>
00123   forceinline void
00124   VarImpVar<VarImp>::update(Space& home, VarImpVar<VarImp>& y) {
00125     x = y.x->copy(home);
00126   }
00127   template<class VarImp>
00128   forceinline bool
00129   VarImpVar<VarImp>::same(const VarImpVar<VarImp>& y) const {
00130     return varimp() == y.varimp();
00131   }
00132   template<class VarImp>
00133   forceinline bool
00134   VarImpVar<VarImp>::before(const VarImpVar<VarImp>& y) const {
00135     return varimp() < y.varimp();
00136   }
00137 
00138 }
00139 
00140 // STATISTICS: kernel-var