Scippy

SCIP

Solving Constraint Integer Programs

type_branch.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) 2002-2020 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 scipopt.org. */
13 /* */
14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
15 
16 /**@file type_branch.h
17  * @ingroup TYPEDEFINITIONS
18  * @brief type definitions for branching rules
19  * @author Tobias Achterberg
20  *
21  * This file defines the interface for branching rules implemented in C.
22  *
23  * - \ref BRANCH "Instructions for implementing a branching rule"
24  * - \ref PRIMALHEURISTICS "List of available branching rule"
25  * - \ref scip::ObjBranchrule "C++ wrapper class"
26  */
27 
28 /** @defgroup DEFPLUGINS_BRANCH Default branching rules
29  * @ingroup DEFPLUGINS
30  * @brief implementation files (.c files) of the default branching rules of SCIP
31  */
32 
33 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
34 
35 #ifndef __SCIP_TYPE_BRANCH_H__
36 #define __SCIP_TYPE_BRANCH_H__
37 
38 #include "scip/def.h"
39 #include "scip/type_result.h"
40 #include "scip/type_scip.h"
41 
42 #ifdef __cplusplus
43 extern "C" {
44 #endif
45 
46 typedef struct SCIP_BranchCand SCIP_BRANCHCAND; /**< branching candidate storage */
47 typedef struct SCIP_Branchrule SCIP_BRANCHRULE; /**< branching method data structure */
48 typedef struct SCIP_BranchruleData SCIP_BRANCHRULEDATA; /**< branching method specific data */
49 typedef struct SCIP_Treemodel SCIP_TREEMODEL; /**< parameter storage for the Treemodel branching rules */
50 
51 
52 /** copy method for branchrule plugins (called when SCIP copies plugins)
53  *
54  * input:
55  * - scip : SCIP main data structure
56  * - branchrule : the branching rule itself
57  */
58 #define SCIP_DECL_BRANCHCOPY(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
59 
60 /** destructor of branching method to free user data (called when SCIP is exiting)
61  *
62  * input:
63  * - scip : SCIP main data structure
64  * - branchrule : the branching rule itself
65  */
66 #define SCIP_DECL_BRANCHFREE(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
67 
68 /** initialization method of branching rule (called after problem was transformed)
69  *
70  * input:
71  * - scip : SCIP main data structure
72  * - branchrule : the branching rule itself
73  */
74 #define SCIP_DECL_BRANCHINIT(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
75 
76 /** deinitialization method of branching rule (called before transformed problem is freed)
77  *
78  * input:
79  * - scip : SCIP main data structure
80  * - branchrule : the branching rule itself
81  */
82 #define SCIP_DECL_BRANCHEXIT(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
83 
84 /** solving process initialization method of branching rule (called when branch and bound process is about to begin)
85  *
86  * This method is called when the presolving was finished and the branch and bound process is about to begin.
87  * The branching rule may use this call to initialize its branch and bound specific data.
88  *
89  * input:
90  * - scip : SCIP main data structure
91  * - branchrule : the branching rule itself
92  */
93 #define SCIP_DECL_BRANCHINITSOL(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
94 
95 /** solving process deinitialization method of branching rule (called before branch and bound process data is freed)
96  *
97  * This method is called before the branch and bound process is freed.
98  * The branching rule should use this call to clean up its branch and bound data.
99  *
100  * input:
101  * - scip : SCIP main data structure
102  * - branchrule : the branching rule itself
103  */
104 #define SCIP_DECL_BRANCHEXITSOL(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule)
105 
106 /** branching execution method for fractional LP solutions
107  *
108  * input:
109  * - scip : SCIP main data structure
110  * - branchrule : the branching rule itself
111  * - allowaddcons : is the branching rule allowed to add constraints to the current node in order to cut off the
112  * current solution instead of creating a branching?
113  * - result : pointer to store the result of the branching call
114  *
115  * possible return values for *result (if more than one applies, the first in the list should be used):
116  * - SCIP_CUTOFF : the current node was detected to be infeasible
117  * - SCIP_CONSADDED : an additional constraint (e.g. a conflict constraint) was generated; this result code must not be
118  * returned, if allowaddcons is FALSE
119  * - SCIP_REDUCEDDOM : a domain was reduced that rendered the current LP solution infeasible
120  * - SCIP_SEPARATED : a cutting plane was generated
121  * - SCIP_BRANCHED : branching was applied
122  * - SCIP_DIDNOTFIND : the branching rule searched, but did not find a branching
123  * - SCIP_DIDNOTRUN : the branching rule was skipped
124  */
125 #define SCIP_DECL_BRANCHEXECLP(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule, SCIP_Bool allowaddcons, SCIP_RESULT* result)
126 
127 
128 /** branching execution method for external candidates
129  *
130  * input:
131  * - scip : SCIP main data structure
132  * - branchrule : the branching rule itself
133  * - allowaddcons : is the branching rule allowed to add constraints to the current node in order to cut off the
134  * current solution instead of creating a branching?
135  * - result : pointer to store the result of the branching call
136  *
137  * possible return values for *result (if more than one applies, the first in the list should be used):
138  * - SCIP_CUTOFF : the current node was detected to be infeasible
139  * - SCIP_CONSADDED : an additional constraint (e.g. a conflict constraint) was generated; this result code must not be
140  * returned, if allowaddcons is FALSE
141  * - SCIP_REDUCEDDOM : a domain was reduced that rendered the current pseudo solution infeasible
142  * - SCIP_BRANCHED : branching was applied
143  * - SCIP_DIDNOTFIND : the branching rule searched, but did not find a branching
144  * - SCIP_DIDNOTRUN : the branching rule was skipped
145  */
146 #define SCIP_DECL_BRANCHEXECEXT(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule, SCIP_Bool allowaddcons, SCIP_RESULT* result)
147 
148 
149 /** branching execution method for not completely fixed pseudo solutions
150  *
151  * input:
152  * - scip : SCIP main data structure
153  * - branchrule : the branching rule itself
154  * - allowaddcons : is the branching rule allowed to add constraints to the current node in order to cut off the
155  * current solution instead of creating a branching?
156  * - result : pointer to store the result of the branching call
157  *
158  * possible return values for *result (if more than one applies, the first in the list should be used):
159  * - SCIP_CUTOFF : the current node was detected to be infeasible
160  * - SCIP_CONSADDED : an additional constraint (e.g. a conflict constraint) was generated; this result code must not be
161  * returned, if allowaddcons is FALSE
162  * - SCIP_REDUCEDDOM : a domain was reduced that rendered the current pseudo solution infeasible
163  * - SCIP_BRANCHED : branching was applied
164  * - SCIP_DIDNOTFIND : the branching rule searched, but did not find a branching
165  * - SCIP_DIDNOTRUN : the branching rule was skipped
166  */
167 #define SCIP_DECL_BRANCHEXECPS(x) SCIP_RETCODE x (SCIP* scip, SCIP_BRANCHRULE* branchrule, SCIP_Bool allowaddcons, SCIP_RESULT* result)
168 
169 #ifdef __cplusplus
170 }
171 #endif
172 
173 #endif
SCIP_BRANCHRULEDATA
struct SCIP_BranchruleData SCIP_BRANCHRULEDATA
Definition: type_branch.h:48
SCIP_Treemodel
Definition: treemodel.c:92
type_scip.h
type definitions for SCIP&#39;s main datastructure
SCIP_Branchrule
Definition: struct_branch.h:69
type_result.h
result codes for SCIP callback methods
def.h
common defines and data types used in all packages of SCIP
SCIP_BranchCand
Definition: struct_branch.h:37