Scippy

SCIP

Solving Constraint Integer Programs

scip_pricer.h
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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"); */
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24 
25 /**@file scip_pricer.h
26  * @ingroup PUBLICCOREAPI
27  * @brief public methods for variable pricer plugins
28  * @author Tobias Achterberg
29  * @author Timo Berthold
30  * @author Thorsten Koch
31  * @author Alexander Martin
32  * @author Marc Pfetsch
33  * @author Kati Wolter
34  * @author Gregor Hendel
35  * @author Leona Gottwald
36  */
37 
38 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
39 
40 #ifndef __SCIP_SCIP_PRICER_H__
41 #define __SCIP_SCIP_PRICER_H__
42 
43 
44 #include "scip/def.h"
45 #include "scip/type_pricer.h"
46 #include "scip/type_result.h"
47 #include "scip/type_retcode.h"
48 #include "scip/type_scip.h"
49 
50 #ifdef __cplusplus
51 extern "C" {
52 #endif
53 
54 /**@addtogroup PublicPricerMethods
55  *
56  * @{
57  */
58 
59 /** creates a variable pricer and includes it in SCIP
60  * To use the variable pricer for solving a problem, it first has to be activated with a call to SCIPactivatePricer().
61  * This should be done during the problem creation stage.
62  *
63  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
64  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
65  *
66  * @pre This method can be called if SCIP is in one of the following stages:
67  * - \ref SCIP_STAGE_INIT
68  * - \ref SCIP_STAGE_PROBLEM
69  *
70  * @note method has all pricer callbacks as arguments and is thus changed every time a new callback is added
71  * in future releases; consider using SCIPincludePricerBasic() and setter functions
72  * if you seek for a method which is less likely to change in future releases
73  */
74 SCIP_EXPORT
76  SCIP* scip, /**< SCIP data structure */
77  const char* name, /**< name of variable pricer */
78  const char* desc, /**< description of variable pricer */
79  int priority, /**< priority of the variable pricer */
80  SCIP_Bool delay, /**< should the pricer be delayed until no other pricers or already existing
81  * problem variables with negative reduced costs are found?
82  * if this is set to FALSE it may happen that the pricer produces columns
83  * that already exist in the problem (which are also priced in by the
84  * default problem variable pricing in the same round) */
85  SCIP_DECL_PRICERCOPY ((*pricercopy)), /**< copy method of variable pricer or NULL if you don't want to copy your plugin into sub-SCIPs */
86  SCIP_DECL_PRICERFREE ((*pricerfree)), /**< destructor of variable pricer */
87  SCIP_DECL_PRICERINIT ((*pricerinit)), /**< initialize variable pricer */
88  SCIP_DECL_PRICEREXIT ((*pricerexit)), /**< deinitialize variable pricer */
89  SCIP_DECL_PRICERINITSOL((*pricerinitsol)),/**< solving process initialization method of variable pricer */
90  SCIP_DECL_PRICEREXITSOL((*pricerexitsol)),/**< solving process deinitialization method of variable pricer */
91  SCIP_DECL_PRICERREDCOST((*pricerredcost)),/**< reduced cost pricing method of variable pricer for feasible LPs */
92  SCIP_DECL_PRICERFARKAS((*pricerfarkas)), /**< Farkas pricing method of variable pricer for infeasible LPs */
93  SCIP_PRICERDATA* pricerdata /**< variable pricer data */
94  );
95 
96 /** creates a variable pricer and includes it in SCIP with all non-fundamental callbacks set to NULL;
97  * if needed, these can be added afterwards via setter functions SCIPsetPricerCopy(), SCIPsetPricerFree(),
98  * SCIPsetPricerInity(), SCIPsetPricerExit(), SCIPsetPricerInitsol(), SCIPsetPricerExitsol(),
99  * SCIPsetPricerFarkas();
100  *
101  * To use the variable pricer for solving a problem, it first has to be activated with a call to SCIPactivatePricer().
102  * This should be done during the problem creation stage.
103  *
104  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
105  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
106  *
107  * @pre This method can be called if SCIP is in one of the following stages:
108  * - \ref SCIP_STAGE_INIT
109  * - \ref SCIP_STAGE_PROBLEM
110  *
111  * @note if you want to set all callbacks with a single method call, consider using SCIPincludePricer() instead
112  */
113 SCIP_EXPORT
115  SCIP* scip, /**< SCIP data structure */
116  SCIP_PRICER** pricerptr, /**< reference to a pricer, or NULL */
117  const char* name, /**< name of variable pricer */
118  const char* desc, /**< description of variable pricer */
119  int priority, /**< priority of the variable pricer */
120  SCIP_Bool delay, /**< should the pricer be delayed until no other pricers or already existing
121  * problem variables with negative reduced costs are found?
122  * if this is set to FALSE it may happen that the pricer produces columns
123  * that already exist in the problem (which are also priced in by the
124  * default problem variable pricing in the same round) */
125  SCIP_DECL_PRICERREDCOST((*pricerredcost)),/**< reduced cost pricing method of variable pricer for feasible LPs */
126  SCIP_DECL_PRICERFARKAS((*pricerfarkas)), /**< Farkas pricing method of variable pricer for infeasible LPs */
127  SCIP_PRICERDATA* pricerdata /**< variable pricer data */
128  );
129 
130 /** sets copy method of pricer
131  *
132  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
133  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
134  *
135  * @pre This method can be called if SCIP is in one of the following stages:
136  * - \ref SCIP_STAGE_INIT
137  * - \ref SCIP_STAGE_PROBLEM
138  */
139 SCIP_EXPORT
141  SCIP* scip, /**< SCIP data structure */
142  SCIP_PRICER* pricer, /**< pricer */
143  SCIP_DECL_PRICERCOPY ((*pricercopy)) /**< copy method of pricer or NULL if you don't want to copy your plugin into sub-SCIPs */
144  );
145 
146 /** sets destructor method of pricer
147  *
148  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
149  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
150  *
151  * @pre This method can be called if SCIP is in one of the following stages:
152  * - \ref SCIP_STAGE_INIT
153  * - \ref SCIP_STAGE_PROBLEM
154  */
155 SCIP_EXPORT
157  SCIP* scip, /**< SCIP data structure */
158  SCIP_PRICER* pricer, /**< pricer */
159  SCIP_DECL_PRICERFREE ((*pricerfree)) /**< destructor of pricer */
160  );
161 
162 /** sets initialization method of pricer
163  *
164  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
165  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
166  *
167  * @pre This method can be called if SCIP is in one of the following stages:
168  * - \ref SCIP_STAGE_INIT
169  * - \ref SCIP_STAGE_PROBLEM
170  */
171 SCIP_EXPORT
173  SCIP* scip, /**< SCIP data structure */
174  SCIP_PRICER* pricer, /**< pricer */
175  SCIP_DECL_PRICERINIT ((*pricerinit)) /**< initialize pricer */
176  );
177 
178 /** sets deinitialization method of pricer
179  *
180  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
181  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
182  *
183  * @pre This method can be called if SCIP is in one of the following stages:
184  * - \ref SCIP_STAGE_INIT
185  * - \ref SCIP_STAGE_PROBLEM
186  */
187 SCIP_EXPORT
189  SCIP* scip, /**< SCIP data structure */
190  SCIP_PRICER* pricer, /**< pricer */
191  SCIP_DECL_PRICEREXIT ((*pricerexit)) /**< deinitialize pricer */
192  );
193 
194 /** sets solving process initialization method of pricer
195  *
196  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
197  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
198  *
199  * @pre This method can be called if SCIP is in one of the following stages:
200  * - \ref SCIP_STAGE_INIT
201  * - \ref SCIP_STAGE_PROBLEM
202  */
203 SCIP_EXPORT
205  SCIP* scip, /**< SCIP data structure */
206  SCIP_PRICER* pricer, /**< pricer */
207  SCIP_DECL_PRICERINITSOL ((*pricerinitsol))/**< solving process initialization method of pricer */
208  );
209 
210 /** sets solving process deinitialization method of pricer
211  *
212  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
213  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
214  *
215  * @pre This method can be called if SCIP is in one of the following stages:
216  * - \ref SCIP_STAGE_INIT
217  * - \ref SCIP_STAGE_PROBLEM
218  */
219 SCIP_EXPORT
221  SCIP* scip, /**< SCIP data structure */
222  SCIP_PRICER* pricer, /**< pricer */
223  SCIP_DECL_PRICEREXITSOL((*pricerexitsol)) /**< solving process deinitialization method of pricer */
224  );
225 
226 /** returns the variable pricer of the given name, or NULL if not existing */
227 SCIP_EXPORT
229  SCIP* scip, /**< SCIP data structure */
230  const char* name /**< name of variable pricer */
231  );
232 
233 /** returns the array of currently available variable pricers; active pricers are in the first slots of the array */
234 SCIP_EXPORT
236  SCIP* scip /**< SCIP data structure */
237  );
238 
239 /** returns the number of currently available variable pricers */
240 SCIP_EXPORT
241 int SCIPgetNPricers(
242  SCIP* scip /**< SCIP data structure */
243  );
244 
245 /** returns the number of currently active variable pricers, that are used in the LP solving loop */
246 SCIP_EXPORT
248  SCIP* scip /**< SCIP data structure */
249  );
250 
251 /** sets the priority of a variable pricer */
252 SCIP_EXPORT
254  SCIP* scip, /**< SCIP data structure */
255  SCIP_PRICER* pricer, /**< variable pricer */
256  int priority /**< new priority of the variable pricer */
257  );
258 
259 /** activates pricer to be used for the current problem
260  * This method should be called during the problem creation stage for all pricers that are necessary to solve
261  * the problem model.
262  * The pricers are automatically deactivated when the problem is freed.
263  *
264  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
265  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
266  *
267  * @pre This method can be called if SCIP is in one of the following stages:
268  * - \ref SCIP_STAGE_PROBLEM
269  */
270 SCIP_EXPORT
272  SCIP* scip, /**< SCIP data structure */
273  SCIP_PRICER* pricer /**< variable pricer */
274  );
275 
276 /** deactivates pricer
277  *
278  * @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
279  * SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
280  *
281  * @pre This method can be called if SCIP is in one of the following stages:
282  * - \ref SCIP_STAGE_PROBLEM
283  * - \ref SCIP_STAGE_EXITSOLVE
284  */
285 SCIP_EXPORT
287  SCIP* scip, /**< SCIP data structure */
288  SCIP_PRICER* pricer /**< variable pricer */
289  );
290 
291 /** @} */
292 
293 #ifdef __cplusplus
294 }
295 #endif
296 
297 #endif
SCIP_RETCODE SCIPsetPricerPriority(SCIP *scip, SCIP_PRICER *pricer, int priority)
Definition: scip_pricer.c:359
#define SCIP_DECL_PRICEREXIT(x)
Definition: type_pricer.h:79
int SCIPgetNActivePricers(SCIP *scip)
Definition: scip_pricer.c:348
SCIP_PRICER * SCIPfindPricer(SCIP *scip, const char *name)
Definition: scip_pricer.c:311
enum SCIP_Retcode SCIP_RETCODE
Definition: type_retcode.h:63
type definitions for return codes for SCIP methods
#define SCIP_DECL_PRICEREXITSOL(x)
Definition: type_pricer.h:101
SCIP_RETCODE SCIPsetPricerExit(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICEREXIT((*pricerexit)))
Definition: scip_pricer.c:247
SCIP_RETCODE SCIPsetPricerExitsol(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICEREXITSOL((*pricerexitsol)))
Definition: scip_pricer.c:295
#define SCIP_DECL_PRICERCOPY(x)
Definition: type_pricer.h:55
SCIP_RETCODE SCIPdeactivatePricer(SCIP *scip, SCIP_PRICER *pricer)
Definition: scip_pricer.c:406
type definitions for variable pricers
SCIP_RETCODE SCIPincludePricerBasic(SCIP *scip, SCIP_PRICER **pricerptr, const char *name, const char *desc, int priority, SCIP_Bool delay, SCIP_DECL_PRICERREDCOST((*pricerredcost)), SCIP_DECL_PRICERFARKAS((*pricerfarkas)), SCIP_PRICERDATA *pricerdata)
Definition: scip_pricer.c:127
type definitions for SCIP&#39;s main datastructure
SCIP_DECL_PRICERINIT(ObjPricerVRP::scip_init)
Definition: pricer_vrp.cpp:83
SCIP_RETCODE SCIPsetPricerInit(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICERINIT((*pricerinit)))
Definition: scip_pricer.c:223
SCIP_DECL_PRICERFARKAS(ObjPricerVRP::scip_farkas)
Definition: pricer_vrp.cpp:246
SCIP_RETCODE SCIPactivatePricer(SCIP *scip, SCIP_PRICER *pricer)
Definition: scip_pricer.c:384
SCIP_DECL_PRICERREDCOST(ObjPricerVRP::scip_redcost)
Definition: pricer_vrp.cpp:225
#define SCIP_Bool
Definition: def.h:93
#define SCIP_DECL_PRICERINITSOL(x)
Definition: type_pricer.h:90
int SCIPgetNPricers(SCIP *scip)
Definition: scip_pricer.c:337
SCIP_RETCODE SCIPsetPricerFree(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICERFREE((*pricerfree)))
Definition: scip_pricer.c:199
SCIP_RETCODE SCIPsetPricerInitsol(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICERINITSOL((*pricerinitsol)))
Definition: scip_pricer.c:271
result codes for SCIP callback methods
SCIP_RETCODE SCIPincludePricer(SCIP *scip, const char *name, const char *desc, int priority, SCIP_Bool delay, SCIP_DECL_PRICERCOPY((*pricercopy)), SCIP_DECL_PRICERFREE((*pricerfree)), SCIP_DECL_PRICERINIT((*pricerinit)), SCIP_DECL_PRICEREXIT((*pricerexit)), SCIP_DECL_PRICERINITSOL((*pricerinitsol)), SCIP_DECL_PRICEREXITSOL((*pricerexitsol)), SCIP_DECL_PRICERREDCOST((*pricerredcost)), SCIP_DECL_PRICERFARKAS((*pricerfarkas)), SCIP_PRICERDATA *pricerdata)
Definition: scip_pricer.c:69
struct SCIP_PricerData SCIP_PRICERDATA
Definition: type_pricer.h:45
#define SCIP_DECL_PRICERFREE(x)
Definition: type_pricer.h:63
SCIP_RETCODE SCIPsetPricerCopy(SCIP *scip, SCIP_PRICER *pricer, SCIP_DECL_PRICERCOPY((*pricercopy)))
Definition: scip_pricer.c:175
common defines and data types used in all packages of SCIP
SCIP_PRICER ** SCIPgetPricers(SCIP *scip)
Definition: scip_pricer.c:324