Scippy

    SCIP

    Solving Constraint Integer Programs

    heur_intshifting.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) 2002-2025 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 heur_intshifting.h
    26 * @ingroup PRIMALHEURISTICS
    27 * @brief LP rounding heuristic that tries to recover from intermediate infeasibilities, shifts integer variables, and
    28 * solves a final LP to calculate feasible values for continuous variables
    29 * @author Tobias Achterberg
    30 *
    31 * This heuristic is similar to the Shifting heuristic (see @ref heur_shifting.h), but it ignores continuous variables
    32 * during the shifting phase and solves a final LP to find feasible (and optimal w.r.t. the integer fixings) values for
    33 * the continuous variables.
    34 */
    35
    36/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
    37
    38#ifndef __SCIP_HEUR_INTSHIFTING_H__
    39#define __SCIP_HEUR_INTSHIFTING_H__
    40
    41#include "scip/def.h"
    42#include "scip/type_retcode.h"
    43#include "scip/type_scip.h"
    44
    45#ifdef __cplusplus
    46extern "C" {
    47#endif
    48
    49/** creates the intshifting heuristic and includes it in SCIP
    50 *
    51 * @ingroup PrimalHeuristicIncludes
    52 */
    53SCIP_EXPORT
    55 SCIP* scip /**< SCIP data structure */
    56 );
    57
    58#ifdef __cplusplus
    59}
    60#endif
    61
    62#endif
    common defines and data types used in all packages of SCIP
    SCIP_RETCODE SCIPincludeHeurIntshifting(SCIP *scip)
    type definitions for return codes for SCIP methods
    enum SCIP_Retcode SCIP_RETCODE
    Definition: type_retcode.h:63
    type definitions for SCIP's main datastructure