cons_countsols.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/*    Copyright (C) 2002-2022 Konrad-Zuse-Zentrum                            */
/*                            fuer Informationstechnik Berlin                */
/*                                                                           */
/*  SCIP is distributed under the terms of the ZIB Academic License.         */
/*                                                                           */
/*  You should have received a copy of the ZIB Academic License              */
/*  along with SCIP; see the file COPYING. If not visit scipopt.org.         */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file   cons_countsols.h
 * @ingroup CONSHDLRS
 * @brief  Constraint handler for counting feasible solutions
 * @author Stefan Heinz
 * @author Michael Winkler
 *
 */

/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/

#ifndef __SCIP_CONS_COUNTSOLS_H__
#define __SCIP_CONS_COUNTSOLS_H__

#include "scip/def.h"
#include "scip/type_dialog.h"
#include "scip/type_misc.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_var.h"

#ifdef __cplusplus
extern "C" {
#endif

/** creates the handler for countsol constraints and includes it in SCIP
 *
 * @ingroup ConshdlrIncludes
 * */
SCIP_EXPORT
SCIP_RETCODE SCIPincludeConshdlrCountsols(
   SCIP*                 scip                /**< SCIP data structure */
   );

/**@addtogroup CONSHDLRS
 *
 * @{
 *
 * @name Constraint Handler for counting solutions
 *
 * @{
 *
 * If this constraint handler is activated than it counts or collects all feasible solutions. We refer to \ref COUNTER for
 * more details about using SCIP for counting feasible solutions.
 */

/** dialog execution method for the count command */
SCIP_EXPORT
SCIP_DECL_DIALOGEXEC(SCIPdialogExecCountPresolve);

/** dialog execution method for the count command */
SCIP_EXPORT
SCIP_DECL_DIALOGEXEC(SCIPdialogExecCount);

/** execution method of dialog for writing all solutions */
SCIP_EXPORT
SCIP_DECL_DIALOGEXEC(SCIPdialogExecWriteAllsolutions);

/** execute counting */
SCIP_EXPORT
SCIP_RETCODE SCIPcount(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns number of feasible solutions found as SCIP_Longint; if the number does not fit into
 *  a SCIP_Longint the valid flag is set to FALSE
 */
SCIP_EXPORT
SCIP_Longint SCIPgetNCountedSols(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Bool*            valid               /**< pointer to store if the return value is valid */
   );

/** returns number of counted solutions as string */
SCIP_EXPORT
void SCIPgetNCountedSolsstr(
   SCIP*                 scip,               /**< SCIP data structure */
   char**                buffer,             /**< buffer to store the number for counted solutions */
   int                   buffersize,         /**< buffer size */
   int*                  requiredsize        /**< pointer to store the required size */
   );

/** returns number of counted feasible subtrees */
SCIP_EXPORT
SCIP_Longint SCIPgetNCountedFeasSubtrees(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** Method to get the sparse solution.
 *
 *  @note You get the pointer to the sparse solutions stored in the constraint handler (not a copy).
 *
 *  @note The sparse solutions are stored w.r.t. the active variables. This are the variables which got not removed
 *        during presolving. For none active variables the value has to be computed depending on their aggregation
 *        type. See for more details about that \ref COLLECTALLFEASEBLES.
 */
SCIP_EXPORT
void SCIPgetCountedSparseSols(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR***           vars,               /**< pointer to variable array defining to variable order */
   int*                  nvars,              /**< number of variables */
   SCIP_SPARSESOL***     sols,               /**< pointer to the solutions */
   int*                  nsols               /**< pointer to number of solutions */
   );

/** setting SCIP parameters for such that a valid counting process is possible */
SCIP_EXPORT
SCIP_RETCODE SCIPsetParamsCountsols(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** @} */

/** @} */

#ifdef __cplusplus
}
#endif

#endif