Scippy

SCIP

Solving Constraint Integer Programs

heur_zeroobj.h
Go to the documentation of this file.
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 */
11 /* */
12 /* http://www.apache.org/licenses/LICENSE-2.0 */
13 /* */
14 /* Unless required by applicable law or agreed to in writing, software */
15 /* distributed under the License is distributed on an "AS IS" BASIS, */
16 /* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
17 /* See the License for the specific language governing permissions and */
18 /* limitations under the License. */
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 heur_zeroobj.h
26  * @ingroup PRIMALHEURISTICS
27  * @brief heuristic that tries to solve the problem without objective. In Gurobi, this heuristic is known as "Hail Mary"
28  * @author Timo Berthold
29  */
30 
31 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
32 
33 #ifndef __SCIP_HEUR_ZEROOBJ_H__
34 #define __SCIP_HEUR_ZEROOBJ_H__
35 
36 #include "scip/def.h"
37 #include "scip/type_heur.h"
38 #include "scip/type_result.h"
39 #include "scip/type_retcode.h"
40 #include "scip/type_scip.h"
41 
42 #ifdef __cplusplus
43 extern "C" {
44 #endif
45 
46 /** creates the zeroobj primal heuristic and includes it in SCIP
47  *
48  * @ingroup PrimalHeuristicIncludes
49  */
50 SCIP_EXPORT
52  SCIP* scip /**< SCIP data structure */
53  );
54 
55 /**@addtogroup PRIMALHEURISTICS
56  *
57  * @{
58  */
59 
60 /** main procedure of the zeroobj heuristic, creates and solves a sub-SCIP */
61 SCIP_EXPORT
63  SCIP* scip, /**< original SCIP data structure */
64  SCIP_HEUR* heur, /**< heuristic data structure */
65  SCIP_RESULT* result, /**< result data structure */
66  SCIP_Real minimprove, /**< factor by which zeroobj should at least improve the incumbent */
67  SCIP_Longint nnodes /**< node limit for the subproblem */
68  );
69 
70 /** @} */
71 
72 #ifdef __cplusplus
73 }
74 #endif
75 
76 #endif
enum SCIP_Result SCIP_RESULT
Definition: type_result.h:61
SCIP_RETCODE SCIPapplyZeroobj(SCIP *scip, SCIP_HEUR *heur, SCIP_RESULT *result, SCIP_Real minimprove, SCIP_Longint nnodes)
Definition: heur_zeroobj.c:504
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
type definitions for primal heuristics
type definitions for SCIP&#39;s main datastructure
SCIP_RETCODE SCIPincludeHeurZeroobj(SCIP *scip)
Definition: heur_zeroobj.c:558
#define SCIP_Real
Definition: def.h:186
result codes for SCIP callback methods
#define SCIP_Longint
Definition: def.h:171
#define nnodes
Definition: gastrans.c:74
common defines and data types used in all packages of SCIP