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 prop_pseudoobj.h 26 * @ingroup PROPAGATORS 27 * @brief Pseudo objective propagator 28 * @author Tobias Achterberg 29 * @author Stefan Heinz 30 * 31 * This propagator propagates the objective function using the cutoff bound and the pseudo objective value. The pseudo 32 * objective value can be seen as minimum activity of the linear objective function. Using this, this propagator checks 33 * if variables with non-zero objective coefficients can exceed the cutoff bound. If this is the case the corresponding 34 * bound can be tightened. 35 */ 36 37 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 38 39 #ifndef __SCIP_PROP_PSEUDOOBJ_H__ 40 #define __SCIP_PROP_PSEUDOOBJ_H__ 41 42 #include "scip/def.h" 43 #include "scip/type_prop.h" 44 #include "scip/type_retcode.h" 45 #include "scip/type_scip.h" 46 #include "scip/type_var.h" 47 48 #ifdef __cplusplus 49 extern "C" { 50 #endif 51 52 /** creates the pseudo objective function propagator and includes it in SCIP 53 * 54 * @ingroup PropagatorIncludes 55 */ 56 SCIP_EXPORT 57 SCIP_RETCODE SCIPincludePropPseudoobj( 58 SCIP* scip /**< SCIP data structure */ 59 ); 60 61 /**@addtogroup PROPAGATORS 62 * 63 * @{ 64 */ 65 66 /** propagates the cutoff bound for the given variables */ 67 SCIP_EXPORT 68 SCIP_RETCODE SCIPpropagateCutoffboundVar( 69 SCIP* scip, /**< SCIP data structure */ 70 SCIP_PROP* prop, /**< propagator, or NULL */ 71 SCIP_VAR* var, /**< variables to propagate */ 72 SCIP_Real cutoffbound, /**< cutoff bound to use */ 73 SCIP_Real pseudoobjval, /**< pseudo objective value to use */ 74 SCIP_Bool* tightened /**< pointer to if the domain was tightened */ 75 ); 76 77 /** @} */ 78 79 #ifdef __cplusplus 80 } 81 #endif 82 83 #endif 84