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4    	/*         SCIP --- Solving Constraint Integer Programs                      */
5    	/*                                                                           */
6    	/*  Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB)                      */
7    	/*                                                                           */
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19   	/*                                                                           */
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22   	/*                                                                           */
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24   	
25   	/**@file   heur_nlpdiving.h
26   	 * @ingroup PRIMALHEURISTICS
27   	 * @brief  NLP diving heuristic that chooses fixings w.r.t. the fractionalities
28   	 * @author Timo Berthold
29   	 * @author Stefan Vigerske
30   	 *
31   	 * Diving heuristic: Iteratively fixes some fractional variables and resolves the LP and NLP relaxations, thereby simulating a
32   	 * depth-first-search in the tree. Double Diving chooses the variable for which the sum of the distances from the relaxations'
33   	 * solutions to a common integer value is minimal and rounds it to thenearest integer.
34   	 * One-level backtracking is applied: If the NLP gets infeasible, the last fixing is undone, and the opposite fixing is tried.
35   	 * If this is infeasible, too, the procedure aborts.
36   	 */
37   	
38   	/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
39   	
40   	#ifndef __SCIP_HEUR_NLPDIVING_H__
41   	#define __SCIP_HEUR_NLPDIVING_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 fracdiving heuristic and includes it in SCIP
52   	 *
53   	 *  @ingroup PrimalHeuristicIncludes
54   	 */
55   	SCIP_EXPORT
56   	SCIP_RETCODE SCIPincludeHeurNlpdiving(
57   	   SCIP*                 scip                /**< SCIP data structure */
58   	   );
59   	
60   	#ifdef __cplusplus
61   	}
62   	#endif
63   	
64   	#endif
65