Scippy

SCIP

Solving Constraint Integer Programs

objvardata.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 objvardata.h
26  * @brief C++ wrapper for user variable data
27  * @author Tobias Achterberg
28  */
29 
30 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
31 
32 #ifndef __SCIP_OBJVARDATA_H__
33 #define __SCIP_OBJVARDATA_H__
34 
35 
36 #include <cassert>
37 
38 #include "scip/scip.h"
39 #include "objscip/objcloneable.h"
40 
41 namespace scip
42 {
43 
44 /** @brief C++ wrapper for user variable data
45  *
46  * This class defines the interface for user variable data implemented in C++. Each variable can be equipped with a
47  * variable data class. This data can be accessed via the function SCIPgetObjVardata() at any time after it is created
48  * and before it is deleted.
49  *
50  * - \ref type_var.h "Corresponding C interface"
51  */
53 {
54 public:
55  /** default constructor */
57  {
58  }
59 
60  /** destructor */
61  virtual ~ObjVardata()
62  {
63  }
64 
65  /** assignment of polymorphic classes causes slicing and is therefore disabled. */
66  ObjVardata& operator=(const ObjVardata& o) = delete;
67 
68  /** assignment of polymorphic classes causes slicing and is therefore disabled. */
69  ObjVardata& operator=(ObjVardata&& o) = delete;
70 
71  /** destructor of user variable data to free original user data (called when original variable is freed)
72  *
73  * If the "deleteobject" flag in the SCIPcreateObjVar() method was set to TRUE, this method is not needed,
74  * because all the work to delete the user variable data can be done in the destructor of the user variable
75  * data object. If the "deleteobject" flag was set to FALSE, and the user variable data object stays alive
76  * after the SCIP variable is freed, this method should delete all the variable specific data that is no
77  * longer needed.
78  */ /*lint -e715*/
80  SCIP* scip, /**< SCIP data structure */
81  SCIP_VAR* var /**< original variable, the data to free is belonging to */
82  )
83  { /*lint --e{715}*/
84  return SCIP_OKAY;
85  }
86 
87  /** creates user data of transformed variable by transforming the original user variable data
88  * (called after variable was transformed)
89  *
90  * The user has two possibilities to implement this method:
91  * 1. Return the pointer to the original variable data object (this) as pointer to the transformed variable data
92  * object. The user may modify some internal attributes, but he has to make sure, that these modifications are
93  * reversed in the scip_deltrans() method, such that the original variable data is restored. In this case,
94  * he should set *deleteobject to FALSE, because the variable data must not be destructed by SCIP after the
95  * solving process is terminated.
96  * 2. Call the copy constructor of the variable data object and return the created copy as transformed variable
97  * data object. In this case, he probably wants to set *deleteobject to TRUE, thus letting SCIP call the
98  * destructor of the object if the transformed variable data is no longer needed.
99  */ /*lint -e715*/
101  SCIP* scip, /**< SCIP data structure */
102  SCIP_VAR* var, /**< transformed variable, the data to create is belonging to */
103  ObjVardata** objvardata, /**< pointer to store the transformed variable data object */
104  SCIP_Bool* deleteobject /**< pointer to store whether SCIP should delete the object after solving */
105  )
106  { /*lint --e{715}*/
107  assert(objvardata != NULL);
108  assert(deleteobject != NULL);
109 
110  /* the default implementation just copies the pointer to the variable data object;
111  * SCIP must not destruct the transformed variable data object, because the original variable data must stay alive
112  */
113  *objvardata = this;
114  *deleteobject = FALSE;
115 
116  return SCIP_OKAY;
117  }
118 
119  /** destructor of user variable data to free transformed user data (called when transformed variable is freed)
120  *
121  * If the "*deleteobject" flag in the scip_trans() method was set to TRUE, this method is not needed,
122  * because all the work to delete the user variable data can be done in the destructor of the user variable
123  * data object. If the "*deleteobject" flag was set to FALSE, and the user variable data object stays alive
124  * after the SCIP variable is freed, this method should delete all the variable specific data that is no
125  * longer needed.
126  */ /*lint -e715*/
128  SCIP* scip, /**< SCIP data structure */
129  SCIP_VAR* var /**< transformed variable, the data to free is belonging to */
130  )
131  { /*lint --e{715}*/
132  return SCIP_OKAY;
133  }
134 
135  /** copies variable data of source SCIP variable for the target SCIP variable
136  *
137  * This method should copy the variable data of the source SCIP and create a target variable data for target
138  * variable. This callback is optional. If the copying process was successful, the target variable gets this variable
139  * data assigned. In case the result pointer is set to SCIP_DIDNOTRUN, the target variable will have no variable data at
140  * all.
141  *
142  * The variable map and the constraint map can be used via the function SCIPgetVarCopy() and SCIPgetConsCopy(),
143  * respectively, to get for certain variables and constraints of the source SCIP the counter parts in the target
144  * SCIP. You should be very carefully in using these two methods since they could lead to infinite loop.
145  *
146  * possible return values for *result:
147  * - SCIP_DIDNOTRUN : the copying process was not performed
148  * - SCIP_SUCCESS : the copying process was successfully performed
149  */ /*lint -e715*/
151  SCIP* scip, /**< SCIP data structure */
152  SCIP* sourcescip, /**< source SCIP main data structure */
153  SCIP_VAR* sourcevar, /**< variable of the source SCIP */
154  SCIP_HASHMAP* varmap, /**< a hashmap which stores the mapping of source variables to corresponding
155  * target variables */
156  SCIP_HASHMAP* consmap, /**< a hashmap which stores the mapping of source contraints to corresponding
157  * target constraints */
158  SCIP_VAR* targetvar, /**< variable of the (targert) SCIP (targetvar is the copy of sourcevar) */
159  ObjVardata** objvardata, /**< pointer to store the copied variable data object */
160  SCIP_RESULT* result /**< pointer to store the result of the call */
161  )
162  { /*lint --e{715}*/
163  (*objvardata) = 0;
164  (*result) = SCIP_DIDNOTRUN;
165  return SCIP_OKAY;
166  }
167 };
168 
169 } /* namespace scip */
170 
171 
172 
173 /** create and capture problem variable and associates the given variable data with the variable;
174  * if variable is of integral type, fractional bounds are automatically rounded
175  */
176 SCIP_EXPORT
178  SCIP* scip, /**< SCIP data structure */
179  SCIP_VAR** var, /**< pointer to variable object */
180  const char* name, /**< name of variable, or NULL for automatic name creation */
181  SCIP_Real lb, /**< lower bound of variable */
182  SCIP_Real ub, /**< upper bound of variable */
183  SCIP_Real obj, /**< objective function value */
184  SCIP_VARTYPE vartype, /**< type of variable */
185  SCIP_Bool initial, /**< should var's column be present in the initial root LP? */
186  SCIP_Bool removable, /**< is var's column removable from the LP (due to aging or cleanup)? */
187  scip::ObjVardata* objvardata, /**< user variable data object */
188  SCIP_Bool deleteobject /**< should the user variable data object be deleted when variable is freed? */
189  );
190 
191 /** gets user variable data object for given problem variable
192  * Warning! This method should only be called after a variable was created with SCIPcreateObjVar().
193  * Otherwise, a segmentation fault may arise, or an undefined pointer is returned.
194  */
195 SCIP_EXPORT
197  SCIP* scip, /**< SCIP data structure */
198  SCIP_VAR* var /**< problem variable */
199  );
200 
201 #endif
enum SCIP_Result SCIP_RESULT
Definition: type_result.h:61
virtual SCIP_RETCODE scip_deltrans(SCIP *scip, SCIP_VAR *var)
Definition: objvardata.h:127
#define FALSE
Definition: def.h:96
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
virtual ~ObjVardata()
Definition: objvardata.h:61
definition of base class for all clonable classes
scip::ObjVardata * SCIPgetObjVardata(SCIP *scip, SCIP_VAR *var)
Definition: objvardata.cpp:207
#define NULL
Definition: lpi_spx1.cpp:164
#define SCIP_Bool
Definition: def.h:93
virtual SCIP_RETCODE scip_delorig(SCIP *scip, SCIP_VAR *var)
Definition: objvardata.h:79
virtual SCIP_RETCODE scip_trans(SCIP *scip, SCIP_VAR *var, ObjVardata **objvardata, SCIP_Bool *deleteobject)
Definition: objvardata.h:100
C++ wrapper for user variable data.
Definition: objvardata.h:52
#define SCIP_Real
Definition: def.h:186
enum SCIP_Vartype SCIP_VARTYPE
Definition: type_var.h:69
SCIP_RETCODE SCIPcreateObjVar(SCIP *scip, SCIP_VAR **var, const char *name, SCIP_Real lb, SCIP_Real ub, SCIP_Real obj, SCIP_VARTYPE vartype, SCIP_Bool initial, SCIP_Bool removable, scip::ObjVardata *objvardata, SCIP_Bool deleteobject)
Definition: objvardata.cpp:175
virtual SCIP_RETCODE scip_copy(SCIP *scip, SCIP *sourcescip, SCIP_VAR *sourcevar, SCIP_HASHMAP *varmap, SCIP_HASHMAP *consmap, SCIP_VAR *targetvar, ObjVardata **objvardata, SCIP_RESULT *result)
Definition: objvardata.h:150
SCIP callable library.
ObjVardata & operator=(const ObjVardata &o)=delete