apis/examples_cpp/transport1_8cpp_source.html

/*

  * GAMS - General Algebraic Modeling System C++ API

  *

  * Copyright (c) 2017-2022 GAMS Software GmbH <support@gams.com>

  * Copyright (c) 2017-2022 GAMS Development Corp. <support@gams.com>

  *

  * Permission is hereby granted, free of charge, to any person obtaining a copy

  * of this software and associated documentation files (the "Software"), to deal

  * in the Software without restriction, including without limitation the rights

  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  * copies of the Software, and to permit persons to whom the Software is

  * furnished to do so, subject to the following conditions:

  *

  * The above copyright notice and this permission notice shall be included in all

  * copies or substantial portions of the Software.

  *

  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

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  * SOFTWARE.

  */

 #include "gams.h"

 #include <iostream>

 #include <fstream>


 using namespace gams;

 using namespace std;


 int main(int argc, char* argv[])

 {

     cout << "---------- Transport 1 --------------" << endl;


     try {

         GAMSWorkspaceInfo wsInfo;

         if (argc > 1)

             wsInfo.setSystemDirectory(argv[1]);

         GAMSWorkspace ws(wsInfo);

         // Retrieves [trnsport] model from GAMS Model Library

         ws.gamsLib("trnsport");


         // create a GAMSJob from file and run it with default settings

         GAMSJob t1 = ws.addJobFromFile("trnsport.gms");


         // Default run

         t1.run();

         cout << "Ran with Defaults:" << endl;

         for (GAMSVariableRecord rec : t1.outDB().getVariable("x"))

             cout << "x(" << rec.key(0) << "," << rec.key(1) << "):" << " level=" << rec.level() << " marginal="

                  << rec.marginal() << endl;


         // Run the job again with another solver

         GAMSOptions opt = ws.addOptions();

         opt.setAllModelTypes("xpress");

         t1.run(opt);

         cout << "Ran with XPRESS:" << endl;

         for (GAMSVariableRecord rec : t1.outDB().getVariable("x"))

             cout << "x(" << rec.key(0) << "," << rec.key(1) << "):" << " level=" << rec.level() << " marginal="

                  << rec.marginal() << endl;


         // Run the job with a solver option file

         ofstream xpressopt(ws.workingDirectory() + cPathSep + "xpress.opt");

         xpressopt << "algorithm=barrier" << endl;

         xpressopt.close();


         opt.setOptFile(1);

         t1.run(opt);

         cout << "Ran with XPRESS with non-default option:" << endl;

         for (GAMSVariableRecord rec : t1.outDB().getVariable("x"))

             cout << "x(" << rec.key(0) << "," << rec.key(1) << "):" << " level=" << rec.level() << " marginal="

                  << rec.marginal() << endl;


     } catch (GAMSException &ex) {

         cout << "GAMSException occured: " << ex.what() << endl;

     } catch (exception &ex) {

         cout << ex.what() << endl;

     }


     return 0;

 }