1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2006 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | #ifndef LEMON_ILP_GLPK_CC |
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20 | #define LEMON_ILP_GLPK_CC |
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21 | |
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22 | ///\file |
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23 | ///\brief Implementation of the LEMON-GLPK lp solver interface. |
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24 | |
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25 | #include <lemon/mip_glpk.h> |
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26 | |
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27 | namespace lemon { |
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28 | |
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29 | MipGlpk::MipGlpk() { |
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30 | lpx_set_class(lp,LPX_MIP); |
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31 | } |
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32 | |
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33 | void MipGlpk::_integer(int i, bool enable){ |
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34 | if(enable){ |
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35 | lpx_set_col_kind(lp,i,LPX_IV); |
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36 | }else{ |
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37 | lpx_set_col_kind(lp,i,LPX_CV); |
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38 | } |
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39 | } |
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40 | |
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41 | bool MipGlpk::_integer(int i){ |
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42 | if(LPX_IV == lpx_get_col_kind(lp,i)){ |
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43 | return true; |
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44 | } |
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45 | return false; |
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46 | } |
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47 | |
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48 | LpGlpk::SolveExitStatus MipGlpk::_solve(){ |
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49 | int result = lpx_simplex(lp); |
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50 | result = lpx_integer(lp); |
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51 | switch (result){ |
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52 | case LPX_E_OBJLL: |
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53 | case LPX_E_OBJUL: |
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54 | case LPX_E_ITLIM: |
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55 | case LPX_E_TMLIM: |
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56 | case LPX_E_OK: |
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57 | return SOLVED; |
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58 | default: |
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59 | return UNSOLVED; |
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60 | } |
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61 | } |
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62 | |
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63 | MipGlpk::Value MipGlpk::_getPrimal(int i){ |
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64 | return lpx_mip_col_val(lp,i); |
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65 | } |
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66 | |
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67 | MipGlpk::Value MipGlpk::_getPrimalValue(){ |
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68 | return lpx_mip_obj_val(lp); |
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69 | } |
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70 | } //END OG NAMESPACE LEMON |
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71 | |
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72 | #endif |
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