1    	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2    	/*                                                                           */
3    	/*                  This file is part of the program and library             */
4    	/*         SCIP --- Solving Constraint Integer Programs                      */
5    	/*                                                                           */
6    	/*  Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB)                      */
7    	/*                                                                           */
8    	/*  Licensed under the Apache License, Version 2.0 (the "License");          */
9    	/*  you may not use this file except in compliance with the License.         */
10   	/*  You may obtain a copy of the License at                                  */
11   	/*                                                                           */
12   	/*      http://www.apache.org/licenses/LICENSE-2.0                           */
13   	/*                                                                           */
14   	/*  Unless required by applicable law or agreed to in writing, software      */
15   	/*  distributed under the License is distributed on an "AS IS" BASIS,        */
16   	/*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
17   	/*  See the License for the specific language governing permissions and      */
18   	/*  limitations under the License.                                           */
19   	/*                                                                           */
20   	/*  You should have received a copy of the Apache-2.0 license                */
21   	/*  along with SCIP; see the file LICENSE. If not visit scipopt.org.         */
22   	/*                                                                           */
23   	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24   	
25   	/**@file   presol_dualcomp.h
26   	 * @ingroup PRESOLVERS
27   	 * @brief  dual compensation presolver
28   	 * @author Dieter Weninger
29   	 *
30   	 * This presolver looks for variables with
31   	 *         i) objcoef >= 0 and exactly one downlock
32   	 *        ii) objcoef <= 0 and exactly one uplock
33   	 * and fixes the variable in case i) at the lower bound and in case ii) at the
34   	 * upper bound if a combination of singleton continuous variables can compensate
35   	 * the downlock in case i) and the uplock in case ii).
36   	 */
37   	
38   	/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
39   	
40   	#ifndef __SCIP_PRESOL_DUALCOMP_H__
41   	#define __SCIP_PRESOL_DUALCOMP_H__
42   	
43   	#include "scip/def.h"
44   	#include "scip/type_retcode.h"
45   	#include "scip/type_scip.h"
46   	
47   	#ifdef __cplusplus
48   	extern "C" {
49   	#endif
50   	
51   	/** creates the dualcomp presolver and includes it in SCIP
52   	 *
53   	 * @ingroup PresolverIncludes
54   	 */
55   	SCIP_EXPORT
56   	SCIP_RETCODE SCIPincludePresolDualcomp(
57   	   SCIP*                 scip                /**< SCIP data structure */
58   	   );
59   	
60   	#ifdef __cplusplus
61   	}
62   	#endif
63   	
64   	#endif
65