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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* */
/* This file is part of the class library */
/* SoPlex --- the Sequential object-oriented simPlex. */
/* */
/* Copyright (c) 1996-2025 Zuse Institute Berlin (ZIB) */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
/* See the License for the specific language governing permissions and */
/* limitations under the License. */
/* */
/* You should have received a copy of the Apache-2.0 license */
/* along with SoPlex; see the file LICENSE. If not email to soplex@zib.de. */
/* */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* Test a for a bug in soplex (version 1.4), which avoids the change of the objective. */
#include <sstream>
#include <soplex.h>
using namespace soplex;
const char lpstr[] =
"Maximize \n"
" obj: x0 + x1 \n"
"Subject To \n"
" c1: x0 + x1 <= 1 \n"
" c2: x0 + x1 >= -1 \n"
" c3: x0 - x1 <= 1 \n"
" c4: x0 - x1 >= -1 \n"
"Bounds \n"
" 0 <= x0 \n"
" 0 <= x1 \n"
"End \n";
int main()
{
SoPlex lp;
std::istringstream is(lpstr);
lp.readLPF(is);
lp.optimize();
std::cerr << lp.objValue() << std::endl;
lp.changeSense(SoPlex::MINIMIZE);
lp.optimize();
std::cerr << lp.objValue() << std::endl;
return 0;
}
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