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2    	/*                                                                           */
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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.         */
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11   	/*                                                                           */
12   	/*      http://www.apache.org/licenses/LICENSE-2.0                           */
13   	/*                                                                           */
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15   	/*  distributed under the License is distributed on an "AS IS" BASIS,        */
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19   	/*                                                                           */
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21   	/*  along with SCIP; see the file LICENSE. If not visit scipopt.org.         */
22   	/*                                                                           */
23   	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24   	
25   	/**@file   heur_fracdiving.h
26   	 * @ingroup PRIMALHEURISTICS
27   	 * @brief  LP diving heuristic that chooses fixings w.r.t. the fractionalities
28   	 * @author Tobias Achterberg
29   	 *
30   	 * Diving heuristic: Iteratively fixes some fractional variable and resolves the LP-relaxation, thereby simulating a
31   	 * depth-first-search in the tree. Fractional Diving chooses the variable with the highest fractionality and rounds it to the
32   	 * nearest integer. One-level backtracking is applied: If the LP gets infeasible, the last fixing is undone, and the
33   	 * opposite fixing is tried. If this is infeasible, too, the procedure aborts.
34   	 */
35   	
36   	/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
37   	
38   	#ifndef __SCIP_HEUR_FRACDIVING_H__
39   	#define __SCIP_HEUR_FRACDIVING_H__
40   	
41   	#include "scip/def.h"
42   	#include "scip/type_retcode.h"
43   	#include "scip/type_scip.h"
44   	
45   	#ifdef __cplusplus
46   	extern "C" {
47   	#endif
48   	
49   	/** creates the fracdiving heuristic and includes it in SCIP
50   	 *
51   	 *  @ingroup PrimalHeuristicIncludes
52   	 */
53   	SCIP_EXPORT
54   	SCIP_RETCODE SCIPincludeHeurFracdiving(
55   	   SCIP*                 scip                /**< SCIP data structure */
56   	   );
57   	
58   	#ifdef __cplusplus
59   	}
60   	#endif
61   	
62   	#endif
63