Scippy

SCIP

Solving Constraint Integer Programs

type_sepa.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) 2002-2019 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 scip.zib.de. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file type_sepa.h
17  * @ingroup TYPEDEFINITIONS
18  * @brief type definitions for separators
19  * @author Tobias Achterberg
20  */
21 
22 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
23 
24 #ifndef __SCIP_TYPE_SEPA_H__
25 #define __SCIP_TYPE_SEPA_H__
26 
27 #include "scip/def.h"
28 #include "scip/type_retcode.h"
29 #include "scip/type_result.h"
30 #include "scip/type_sol.h"
31 #include "scip/type_scip.h"
32 
33 #ifdef __cplusplus
34 extern "C" {
35 #endif
36 
37 typedef struct SCIP_Sepa SCIP_SEPA; /**< separator */
38 typedef struct SCIP_SepaData SCIP_SEPADATA; /**< locally defined separator data */
39 
40 
41 /** copy method for separator plugins (called when SCIP copies plugins)
42  *
43  * input:
44  * - scip : SCIP main data structure
45  * - sepa : the separator itself
46  */
47 #define SCIP_DECL_SEPACOPY(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
48 
49 /** destructor of separator to free user data (called when SCIP is exiting)
50  *
51  * input:
52  * - scip : SCIP main data structure
53  * - sepa : the separator itself
54  */
55 #define SCIP_DECL_SEPAFREE(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
56 
57 /** initialization method of separator (called after problem was transformed)
58  *
59  * input:
60  * - scip : SCIP main data structure
61  * - sepa : the separator itself
62  */
63 #define SCIP_DECL_SEPAINIT(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
64 
65 /** deinitialization method of separator (called before transformed problem is freed)
66  *
67  * input:
68  * - scip : SCIP main data structure
69  * - sepa : the separator itself
70  */
71 #define SCIP_DECL_SEPAEXIT(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
72 
73 /** solving process initialization method of separator (called when branch and bound process is about to begin)
74  *
75  * This method is called when the presolving was finished and the branch and bound process is about to begin.
76  * The separator may use this call to initialize its branch and bound specific data.
77  *
78  * input:
79  * - scip : SCIP main data structure
80  * - sepa : the separator itself
81  */
82 #define SCIP_DECL_SEPAINITSOL(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
83 
84 /** solving process deinitialization method of separator (called before branch and bound process data is freed)
85  *
86  * This method is called before the branch and bound process is freed.
87  * The separator should use this call to clean up its branch and bound data.
88  *
89  * input:
90  * - scip : SCIP main data structure
91  * - sepa : the separator itself
92  */
93 #define SCIP_DECL_SEPAEXITSOL(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa)
94 
95 /** LP solution separation method of separator
96  *
97  * Searches for cutting planes that separate the current LP solution. The method is called in the LP solving loop,
98  * which means that a valid LP solution exists.
99  *
100  * input:
101  * - scip : SCIP main data structure
102  * - sepa : the separator itself
103  * - result : pointer to store the result of the separation call
104  * - allowlocal : should the separator allow local cuts?
105  *
106  * possible return values for *result (if more than one applies, the first in the list should be used):
107  * - SCIP_CUTOFF : the node is infeasible in the variable's bounds and can be cut off
108  * - SCIP_CONSADDED : an additional constraint was generated
109  * - SCIP_REDUCEDDOM : a variable's domain was reduced
110  * - SCIP_SEPARATED : a cutting plane was generated
111  * - SCIP_NEWROUND : a cutting plane was generated and a new separation round should immediately start
112  * - SCIP_DIDNOTFIND : the separator searched, but did not find domain reductions, cutting planes, or cut constraints
113  * - SCIP_DIDNOTRUN : the separator was skipped
114  * - SCIP_DELAYED : the separator was skipped, but should be called again
115  */
116 #define SCIP_DECL_SEPAEXECLP(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa, SCIP_RESULT* result, SCIP_Bool allowlocal)
117 
118 /** arbitrary primal solution separation method of separator
119  *
120  * Searches for cutting planes that separate the given primal solution. The method is called outside the LP solution
121  * loop (e.g., by a relaxator or a primal heuristic), which means that there is no valid LP solution.
122  *
123  * input:
124  * - scip : SCIP main data structure
125  * - sepa : the separator itself
126  * - sol : primal solution that should be separated
127  * - result : pointer to store the result of the separation call
128  * - allowlocal : should the separator allow local cuts?
129  *
130  * possible return values for *result (if more than one applies, the first in the list should be used):
131  * - SCIP_CUTOFF : the node is infeasible in the variable's bounds and can be cut off
132  * - SCIP_CONSADDED : an additional constraint was generated
133  * - SCIP_REDUCEDDOM : a variable's domain was reduced
134  * - SCIP_SEPARATED : a cutting plane was generated
135  * - SCIP_NEWROUND : a cutting plane was generated and a new separation round should immediately start
136  * - SCIP_DIDNOTFIND : the separator searched, but did not find domain reductions, cutting planes, or cut constraints
137  * - SCIP_DIDNOTRUN : the separator was skipped
138  * - SCIP_DELAYED : the separator was skipped, but should be called again
139  */
140 #define SCIP_DECL_SEPAEXECSOL(x) SCIP_RETCODE x (SCIP* scip, SCIP_SEPA* sepa, SCIP_SOL* sol, SCIP_RESULT* result, SCIP_Bool allowlocal)
141 
142 #ifdef __cplusplus
143 }
144 #endif
145 
146 #endif
type_retcode.h
type definitions for return codes for SCIP methods
SCIP_Sepa
Definition: struct_sepa.h:37
type_scip.h
type definitions for SCIP&#39;s main datastructure
type_sol.h
type definitions for storing primal CIP solutions
type_result.h
result codes for SCIP callback methods
def.h
common defines and data types used in all packages of SCIP
SCIP_SEPADATA
struct SCIP_SepaData SCIP_SEPADATA
Definition: type_sepa.h:38