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2    	/*                                                                           */
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4    	/*         SCIP --- Solving Constraint Integer Programs                      */
5    	/*                                                                           */
6    	/*  Copyright 2002-2022 Zuse Institute Berlin                                */
7    	/*                                                                           */
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13   	/*                                                                           */
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19   	/*                                                                           */
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22   	/*                                                                           */
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24   	
25   	/**@file   heur_indicatordiving.h
26   	 * @ingroup PRIMALHEURISTICS
27   	 * @brief  LP diving heuristic that fixes indicator variables controlling semicontinuous variables
28   	 * @author Katrin Halbig
29   	 * @author Alexander Hoen
30   	 *
31   	 * A diving heuristic iteratively rounds some fractional variables or variables determined by constraint handlers,
32   	 * and resolves the LP relaxation. Thereby simulating a depth-first-search in the tree.
33   	 *
34   	 * Indicatordiving focuses on indicator variables, which control semicontinuous variables.
35   	 * If the semicontinuous variable is unbounded, the indicator constraint is not part of the LP and,
36   	 * therefore, the indicator variable is not set to an useful value in the LP solution.
37   	 *
38   	 * For these indicator variables the score depends on the LP value and the bounds of the corresponding semicontinuous variable.
39   	 * If parameter usevarbounds=TRUE, also varbound constraints modeling semicontinuous variables are considered.
40   	 * For all other variables the Farkas score (scaled) is returned.
41   	 */
42   	
43   	/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
44   	
45   	#ifndef __SCIP_HEUR_INDICATORDIVING_H__
46   	#define __SCIP_HEUR_INDICATORDIVING_H__
47   	
48   	#include "scip/def.h"
49   	#include "scip/type_retcode.h"
50   	#include "scip/type_scip.h"
51   	
52   	#ifdef __cplusplus
53   	extern "C" {
54   	#endif
55   	
56   	/** creates the indicatordiving heuristic and includes it in SCIP
57   	 *
58   	 *  @ingroup PrimalHeuristicIncludes
59   	 */
60   	SCIP_EXPORT
61   	SCIP_RETCODE SCIPincludeHeurIndicatordiving(
62   	   SCIP*                 scip                /**< SCIP data structure */
63   	   );
64   	
65   	#ifdef __cplusplus
66   	}
67   	#endif
68   	
69   	#endif
70