Scippy

SCIP

Solving Constraint Integer Programs

heur_shifting.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) 2002-2021 Konrad-Zuse-Zentrum */
7 /* fuer Informationstechnik Berlin */
8 /* */
9 /* SCIP is distributed under the terms of the ZIB Academic License. */
10 /* */
11 /* You should have received a copy of the ZIB Academic License */
12 /* along with SCIP; see the file COPYING. If not visit scipopt.org. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file heur_shifting.h
17  * @ingroup PRIMALHEURISTICS
18  * @brief LP rounding heuristic that tries to recover from intermediate infeasibilities and shifts continuous variables
19  * @author Tobias Achterberg
20  *
21  * This heuristic is similar to the Rounding heuristic (see @ref heur_rounding.h), but it tries to continue in the case
22  * that no rounding can decrease the violation of a linear constraint. In this case, the value of a continuous variable
23  * or an integer variable with integral value will be shifted in order to decrease the violation of the constraint. To
24  * avoid cycling, the procedure terminates after a certain number of non-improving shifts.
25  */
26 
27 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
28 
29 #ifndef __SCIP_HEUR_SHIFTING_H__
30 #define __SCIP_HEUR_SHIFTING_H__
31 
32 #include "scip/def.h"
33 #include "scip/type_retcode.h"
34 #include "scip/type_scip.h"
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 /** creates the shifting heuristic and includes it in SCIP
41  *
42  * @ingroup PrimalHeuristicIncludes
43  */
46  SCIP* scip /**< SCIP data structure */
47  );
48 
49 #ifdef __cplusplus
50 }
51 #endif
52 
53 #endif
#define SCIP_EXPORT
Definition: def.h:100
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:54
type definitions for return codes for SCIP methods
type definitions for SCIP&#39;s main datastructure
SCIP_EXPORT SCIP_RETCODE SCIPincludeHeurShifting(SCIP *scip)
common defines and data types used in all packages of SCIP