Scippy

SCIP

Solving Constraint Integer Programs

presol_dualcomp.h
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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 */
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12 /* http://www.apache.org/licenses/LICENSE-2.0 */
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14 /* Unless required by applicable law or agreed to in writing, software */
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17 /* See the License for the specific language governing permissions and */
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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
57  SCIP* scip /**< SCIP data structure */
58  );
59 
60 #ifdef __cplusplus
61 }
62 #endif
63 
64 #endif
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
SCIP_RETCODE SCIPincludePresolDualcomp(SCIP *scip)
type definitions for SCIP&#39;s main datastructure
common defines and data types used in all packages of SCIP