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# /home/coin/svn-release/Blis-0.94.1/Blis/examples/VRP/VrpVariable.h

Go to the documentation of this file.

    00001 /*===========================================================================*
    00002  * This file is part of a solver for the Vehicle Routing Problem             *
    00003  * developed using the BiCePS Linear Integer Solver (BLIS).                  *
    00004  *                                                                           *
    00005  * This solver is distributed under the Eclipse Public License as part of    *
    00006  * the COIN-OR repository (http://www.coin-or.org).                          *
    00007  *                                                                           *
    00008  * Authors: Yan Xu, Lehigh University                                        *
    00009  *          Ted Ralphs, Lehigh University                                    *
    00010  *                                                                           *
    00011  * Copyright (C) 2007 Yan Xu and Ted Ralphs.                                 *
    00012  * All Rights Reserved.                                                      *
    00013  *===========================================================================*/
    00014
    00015 #ifndef VrpVariable_h_
    00016 #define VrpVariable_h_
    00017
    00018 //#############################################################################
    00019
    00020 #include "BlisVariable.h"
    00021
    00022 //#############################################################################
    00023
    00025 class VrpVariable : public BlisVariable
    00026 {
    00027 private:
    00028
    00029     /* The endpoints of the edge */
    00030     int ends_[2];
    00031     int uind_;
    00032
    00033 protected:
    00034
    00036     AlpsReturnStatus encodeVrp(AlpsEncoded *encoded) {
    00037         AlpsReturnStatus status = AlpsReturnStatusOk;
    00038
    00039         //std::cout << "****** encodeVrp var: size_ = " << size_ << std::endl;
    00040
    00041         encoded->writeRep(ends_[0]);
    00042         encoded->writeRep(ends_[1]);
    00043         encoded->writeRep(uind_);
    00044
    00045         return status;
    00046     }
    00047
    00049     AlpsReturnStatus decodeVrp(AlpsEncoded &encoded) {
    00050         AlpsReturnStatus status = AlpsReturnStatusOk;
    00051
    00052         encoded.readRep(ends_[0]);
    00053         encoded.readRep(ends_[1]);
    00054         encoded.readRep(uind_);
    00055
    00056         //std::cout << "****** decodeVrp var: size_ = " << size_ << std::endl;
    00057
    00058         return status;
    00059     }
    00060
    00061 public:
    00062
    00064     VrpVariable() {
    00065        ends_[0] = 0;
    00066        ends_[1] = 0;
    00067     }
    00068
    00070     VrpVariable(int v1, int v2, int cost, int ub) {
    00071        ends_[0] = v1 < v2 ? v1 : v2;
    00072        ends_[1] = v1 < v2 ? v2 : v1;
    00073        uind_ = ends_[1]*(ends_[1] - 1)/2 + ends_[0];
    00074        int indices [2];
    00075        double values [2];
    00076        indices[0] = ends_[0];
    00077        indices[1] = ends_[1];
    00078        values[0] = values[1] = 1.0;
    00079        setData(2, indices, values);
    00080        setIntType('B');
    00081        setLbHard(0.0);
    00082        setUbHard((double) ub);
    00083        setObjCoef((double) cost);
    00084     }
    00085
    00087     virtual ~VrpVariable() {
    00088         //std::cout << "delete a vrp variable " << std::endl;
    00089     }
    00090
    00093     inline int getIndex() { return uind_; }
    00094     inline int getv0() { return ends_[0]; }
    00095     inline int getv1() { return ends_[1]; }
    00098     virtual void printDesc() {
    00099         std::cout << "(" << getv0() << ", " << getv1() << ")";
    00100     }
    00101
    00103     virtual AlpsReturnStatus encode(AlpsEncoded *encoded){
    00104         AlpsReturnStatus status;
    00105
    00106         status = encodeBcpsObject(encoded);
    00107         status = encodeBlis(encoded);
    00108         status = encodeVrp(encoded);
    00109
    00110         return status;
    00111     }
    00112
    00114     virtual AlpsKnowledge* decode(AlpsEncoded &encoded) const {
    00115         AlpsReturnStatus status = AlpsReturnStatusOk;
    00116         VrpVariable * var = new VrpVariable();
    00117
    00118         // Unpack Bcps part.
    00119         status = var->decodeBcpsObject(encoded);
    00120         if (status) {
    00121             throw CoinError("Failed to decode Bcps part of var",
    00122                             "decode",
    00123                             "BlisObject");
    00124         }
    00125
    00126         // Unpack Blis part.
    00127         status = var->decodeBlis(encoded);
    00128         if (status) {
    00129             throw CoinError("Failed to decode Blis part of var",
    00130                             "decode",
    00131                             "BlisObject");
    00132         }
    00133
    00134         // Unpack Vrp part.
    00135         status = var->decodeVrp(encoded);
    00136         if (status) {
    00137             throw CoinError("Failed to decode Vrp part of var",
    00138                             "decode",
    00139                             "BlisObject");
    00140         }
    00141         return var;
    00142     }
    00143
    00144 };
    00145
    00146 //#############################################################################
    00147
    00148 #endif