Scippy

SCIP

Solving Constraint Integer Programs

cons_and.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) 2002-2024 Zuse Institute Berlin (ZIB) */
7 /* */
8 /* Licensed under the Apache License, Version 2.0 (the "License"); */
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24 
25 /**@file cons_and.h
26  * @ingroup CONSHDLRS
27  * @brief Constraint handler for AND constraints, \f$r = x_1 \wedge x_2 \wedge \dots \wedge x_n\f$
28  * @author Tobias Achterberg
29  * @author Stefan Heinz
30  * @author Michael Winkler
31  *
32  */
33 
34 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
35 
36 #ifndef __SCIP_CONS_AND_H__
37 #define __SCIP_CONS_AND_H__
38 
39 
40 #include "scip/def.h"
41 #include "scip/type_cons.h"
42 #include "scip/type_retcode.h"
43 #include "scip/type_scip.h"
44 #include "scip/type_var.h"
45 
46 #ifdef __cplusplus
47 extern "C" {
48 #endif
49 
50 /** creates the handler for and constraints and includes it in SCIP
51  *
52  * @ingroup ConshdlrIncludes
53  * */
54 SCIP_EXPORT
56  SCIP* scip /**< SCIP data structure */
57  );
58 
59 /**@addtogroup CONSHDLRS
60  *
61  * @{
62  *
63  * @name AND Constraints
64  *
65  * @{
66  *
67  * This constraint handler deals with AND-constraints. These are constraint of the form:
68  *
69  * \f[
70  * r = x_1 \wedge x_2 \wedge \dots \wedge x_n
71  * \f]
72  *
73  * where \f$x_i\f$ is a binary variable for all \f$i\f$. Hence, \f$r\f$ is also of binary type. The variable \f$r\f$ is
74  * called resultant and the \f$x\f$'s operators.
75  */
76 
77 /** creates and captures an and constraint
78  *
79  * @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
80  */
81 SCIP_EXPORT
83  SCIP* scip, /**< SCIP data structure */
84  SCIP_CONS** cons, /**< pointer to hold the created constraint */
85  const char* name, /**< name of constraint */
86  SCIP_VAR* resvar, /**< resultant variable of the operation */
87  int nvars, /**< number of operator variables in the constraint */
88  SCIP_VAR** vars, /**< array with operator variables of constraint */
89  SCIP_Bool initial, /**< should the LP relaxation of constraint be in the initial LP?
90  * Usually set to TRUE. Set to FALSE for 'lazy constraints'. */
91  SCIP_Bool separate, /**< should the constraint be separated during LP processing?
92  * Usually set to TRUE. */
93  SCIP_Bool enforce, /**< should the constraint be enforced during node processing?
94  * TRUE for model constraints, FALSE for additional, redundant constraints. */
95  SCIP_Bool check, /**< should the constraint be checked for feasibility?
96  * TRUE for model constraints, FALSE for additional, redundant constraints. */
97  SCIP_Bool propagate, /**< should the constraint be propagated during node processing?
98  * Usually set to TRUE. */
99  SCIP_Bool local, /**< is constraint only valid locally?
100  * Usually set to FALSE. Has to be set to TRUE, e.g., for branching constraints. */
101  SCIP_Bool modifiable, /**< is constraint modifiable (subject to column generation)?
102  * Usually set to FALSE. In column generation applications, set to TRUE if pricing
103  * adds coefficients to this constraint. */
104  SCIP_Bool dynamic, /**< is constraint subject to aging?
105  * Usually set to FALSE. Set to TRUE for own cuts which
106  * are separated as constraints. */
107  SCIP_Bool removable, /**< should the relaxation be removed from the LP due to aging or cleanup?
108  * Usually set to FALSE. Set to TRUE for 'lazy constraints' and 'user cuts'. */
109  SCIP_Bool stickingatnode /**< should the constraint always be kept at the node where it was added, even
110  * if it may be moved to a more global node?
111  * Usually set to FALSE. Set to TRUE to for constraints that represent node data. */
112  );
113 
114 /** creates and captures an and constraint
115  * in its most basic version, i. e., all constraint flags are set to their basic value as explained for the
116  * method SCIPcreateConsAnd(); all flags can be set via SCIPsetConsFLAGNAME-methods in scip.h
117  *
118  * @see SCIPcreateConsAnd() for information about the basic constraint flag configuration
119  *
120  * @note the constraint gets captured, hence at one point you have to release it using the method SCIPreleaseCons()
121  */
122 SCIP_EXPORT
124  SCIP* scip, /**< SCIP data structure */
125  SCIP_CONS** cons, /**< pointer to hold the created constraint */
126  const char* name, /**< name of constraint */
127  SCIP_VAR* resvar, /**< resultant variable of the operation */
128  int nvars, /**< number of operator variables in the constraint */
129  SCIP_VAR** vars /**< array with operator variables of constraint */
130  );
131 
132 /** gets number of variables in and constraint */
133 SCIP_EXPORT
134 int SCIPgetNVarsAnd(
135  SCIP* scip, /**< SCIP data structure */
136  SCIP_CONS* cons /**< constraint data */
137  );
138 
139 /** gets array of variables in and constraint */
140 SCIP_EXPORT
142  SCIP* scip, /**< SCIP data structure */
143  SCIP_CONS* cons /**< constraint data */
144  );
145 
146 /** gets the resultant variable in and constraint */
147 SCIP_EXPORT
149  SCIP* scip, /**< SCIP data structure */
150  SCIP_CONS* cons /**< constraint data */
151  );
152 
153 /** return if the variables of the AND-constraint are sorted with respect to their indices */
154 SCIP_EXPORT
156  SCIP* scip, /**< SCIP data structure */
157  SCIP_CONS* cons /**< constraint data */
158  );
159 
160 /** sort the variables of the AND-constraint with respect to their indices */
161 SCIP_EXPORT
163  SCIP* scip, /**< SCIP data structure */
164  SCIP_CONS* cons /**< constraint data */
165  );
166 
167 /** when 'upgrading' the given AND-constraint, should the check flag for the upgraded constraint be set to TRUE, even if
168  * the check flag of this AND-constraint is set to FALSE?
169  */
170 SCIP_EXPORT
172  SCIP* scip, /**< SCIP data structure */
173  SCIP_CONS* cons, /**< constraint data */
174  SCIP_Bool flag /**< should an arising constraint from the given AND-constraint be checked,
175  * even if the check flag of the AND-constraint is set to FALSE
176  */
177  );
178 
179 /** when 'upgrading' the given AND-constraint, should the removable flag for the upgraded constraint be set to FALSE,
180  * even if the removable flag of this AND-constraint is set to TRUE?
181  */
182 SCIP_EXPORT
184  SCIP* scip, /**< SCIP data structure */
185  SCIP_CONS* cons, /**< constraint data */
186  SCIP_Bool flag /**< should an arising constraint from the given AND-constraint be not
187  * removable, even if the removable flag of the AND-constraint is set to
188  * TRUE
189  */
190  );
191 
192 /** @} */
193 
194 /** @} */
195 
196 #ifdef __cplusplus
197 }
198 #endif
199 
200 #endif
SCIP_RETCODE SCIPsortAndCons(SCIP *scip, SCIP_CONS *cons)
Definition: cons_and.c:5296
SCIP_RETCODE SCIPincludeConshdlrAnd(SCIP *scip)
Definition: cons_and.c:4983
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
SCIP_Bool SCIPisAndConsSorted(SCIP *scip, SCIP_CONS *cons)
Definition: cons_and.c:5272
SCIP_VAR ** SCIPgetVarsAnd(SCIP *scip, SCIP_CONS *cons)
Definition: cons_and.c:5224
SCIP_RETCODE SCIPcreateConsAnd(SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR *resvar, int nvars, SCIP_VAR **vars, SCIP_Bool initial, SCIP_Bool separate, SCIP_Bool enforce, SCIP_Bool check, SCIP_Bool propagate, SCIP_Bool local, SCIP_Bool modifiable, SCIP_Bool dynamic, SCIP_Bool removable, SCIP_Bool stickingatnode)
Definition: cons_and.c:5071
SCIP_VAR * SCIPgetResultantAnd(SCIP *scip, SCIP_CONS *cons)
Definition: cons_and.c:5249
type definitions for SCIP&#39;s main datastructure
SCIP_RETCODE SCIPcreateConsBasicAnd(SCIP *scip, SCIP_CONS **cons, const char *name, SCIP_VAR *resvar, int nvars, SCIP_VAR **vars)
Definition: cons_and.c:5181
SCIP_RETCODE SCIPchgAndConsRemovableFlagWhenUpgr(SCIP *scip, SCIP_CONS *cons, SCIP_Bool flag)
Definition: cons_and.c:5356
type definitions for problem variables
SCIP_RETCODE SCIPchgAndConsCheckFlagWhenUpgr(SCIP *scip, SCIP_CONS *cons, SCIP_Bool flag)
Definition: cons_and.c:5325
#define SCIP_Bool
Definition: def.h:91
int SCIPgetNVarsAnd(SCIP *scip, SCIP_CONS *cons)
Definition: cons_and.c:5200
common defines and data types used in all packages of SCIP
type definitions for constraints and constraint handlers