lemon/mip_glpk.cc
author deba
Wed, 06 Sep 2006 10:28:13 +0000
changeset 2204 5617107d27e9
parent 2149 b437bdee6fd0
child 2213 2c094dfa176d
permissions -rw-r--r--
Some doc fix
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/* -*- C++ -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library
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 *
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 * Copyright (C) 2003-2006
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_ILP_GLPK_CC
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#define LEMON_ILP_GLPK_CC
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///\file
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///\brief Implementation of the LEMON-GLPK lp solver interface.
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#include <lemon/mip_glpk.h>
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namespace lemon {
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  MipGlpk::MipGlpk() {
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    lpx_set_class(lp,LPX_MIP);
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  }
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  void MipGlpk::_colType(int i, MipGlpk::ColTypes col_type){
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    switch (col_type){
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      case INTEGER:
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	lpx_set_col_kind(lp,i,LPX_IV);
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	break;
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      case REAL:
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	lpx_set_col_kind(lp,i,LPX_CV);
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	break;
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    default:;
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        //FIXME problem
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    }
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  }
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  MipGlpk::ColTypes MipGlpk::_colType(int i){
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    switch (lpx_get_col_kind(lp,i)){
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    case LPX_IV:
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      return INTEGER;//Or binary
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    case LPX_CV:
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      return REAL;
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    default:
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      return REAL;//Error!
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    }
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  }
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  LpGlpk::SolveExitStatus MipGlpk::_solve(){
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    int result = lpx_simplex(lp);
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    result = lpx_integer(lp);
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    switch (result){
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      case LPX_E_OBJLL:
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      case LPX_E_OBJUL:
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      case LPX_E_ITLIM:
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      case LPX_E_TMLIM:
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      case LPX_E_OK:
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        return SOLVED;
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      default:
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        return UNSOLVED;
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    }
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  }
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  LpGlpk::SolutionStatus MipGlpk::_getMipStatus(){
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    //Meg kell nezni: ha az LP is infinite, akkor ez is, ha az is
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    //infeasible, akkor ez is, de ez lehet maskepp is infeasible.
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    int stat=  lpx_mip_status(lp);
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    switch (stat) {
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    case LPX_I_UNDEF://Undefined (no solve has been run yet)
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      return UNDEFINED;
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   case LPX_I_NOFEAS://There is no feasible integral solution (primal, I guess)
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      return INFEASIBLE;
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//     case LPX_UNBND://Unbounded
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//       return INFINITE;
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    case LPX_I_FEAS://Feasible
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      return FEASIBLE;
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    case LPX_I_OPT://Feasible
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      return OPTIMAL;
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    default:
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      return UNDEFINED; //to avoid gcc warning
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      //FIXME error
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    }
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  }  
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  MipGlpk::Value MipGlpk::_getPrimal(int i){
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    return lpx_mip_col_val(lp,i);
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  }
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  MipGlpk::Value MipGlpk::_getPrimalValue(){
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    return lpx_mip_obj_val(lp);
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  }
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} //END OG NAMESPACE LEMON
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#endif