type_var.h

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/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
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/*  Copyright 2002-2022 Zuse Institute Berlin                                */
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/**@file   type_var.h
 * @ingroup TYPEDEFINITIONS
 * @brief  type definitions for problem variables
 * @author Tobias Achterberg
 *
 *  This file defines the interface for user variable data implemented in C. Each variable can be equipped with a
 *  variable data struct. This data can be accessed via the function SCIPgetVardata() at any time after it is created
 *  and before it is deleted.
 *
 *  - \ref scip::ObjVardata "Corresponding C interface"
 */

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

#ifndef __SCIP_TYPE_VAR_H__
#define __SCIP_TYPE_VAR_H__

#ifdef __cplusplus
extern "C" {
#endif

/** status of problem variables */
enum SCIP_Varstatus
{
   SCIP_VARSTATUS_ORIGINAL   = 0,       /**< variable belongs to original problem */
   SCIP_VARSTATUS_LOOSE      = 1,       /**< variable is a loose variable of the transformed problem */
   SCIP_VARSTATUS_COLUMN     = 2,       /**< variable is a column of the transformed problem */
   SCIP_VARSTATUS_FIXED      = 3,       /**< variable is fixed to specific value in the transformed problem */
   SCIP_VARSTATUS_AGGREGATED = 4,       /**< variable is aggregated to x = a*y + c in the transformed problem */
   SCIP_VARSTATUS_MULTAGGR   = 5,       /**< variable is aggregated to x = a_1*y_1 + ... + a_k*y_k + c */
   SCIP_VARSTATUS_NEGATED    = 6        /**< variable is the negation of an original or transformed variable */
};
typedef enum SCIP_Varstatus SCIP_VARSTATUS;

/** variable type */
enum SCIP_Vartype
{
   SCIP_VARTYPE_BINARY     = 0,         /**< binary variable: \f$ x \in \{0,1\} \f$ */
   SCIP_VARTYPE_INTEGER    = 1,         /**< integer variable: \f$ x in \{lb, \dots, ub\} \f$ */
   SCIP_VARTYPE_IMPLINT    = 2,         /**< implicit integer variable: Integrality of this variable is implied for every optimal
                                             solution of the remaining problem after any fixing all integer and binary variables,
                                             without the explicit need to enforce integrality further */
   SCIP_VARTYPE_CONTINUOUS = 3          /**< continuous variable: \f$ lb \leq x \leq ub \f$ */
};
typedef enum SCIP_Vartype SCIP_VARTYPE;

/** domain change data type */
enum SCIP_DomchgType
{
   SCIP_DOMCHGTYPE_DYNAMIC = 0,         /**< dynamic bound changes with size information of arrays */
   SCIP_DOMCHGTYPE_BOTH    = 1,         /**< static domain changes: number of entries equals size of arrays */
   SCIP_DOMCHGTYPE_BOUND   = 2          /**< static domain changes without any hole changes */
};
typedef enum SCIP_DomchgType SCIP_DOMCHGTYPE;

/** bound change type */
enum SCIP_BoundchgType
{
   SCIP_BOUNDCHGTYPE_BRANCHING = 0,     /**< bound change was due to a branching decision */
   SCIP_BOUNDCHGTYPE_CONSINFER = 1,     /**< bound change was due to an inference of a constraint (domain propagation) */
   SCIP_BOUNDCHGTYPE_PROPINFER = 2      /**< bound change was due to an inference of a domain propagator */
};
typedef enum SCIP_BoundchgType SCIP_BOUNDCHGTYPE;

/** types of variable locks */
#define NLOCKTYPES 2                    /**< number of lock types */
enum SCIP_LockType
{
   SCIP_LOCKTYPE_MODEL    = 0,          /**< variable locks for model and check constraints */
   SCIP_LOCKTYPE_CONFLICT = 1           /**< variable locks for conflict constraints */
};
typedef enum SCIP_LockType SCIP_LOCKTYPE;

typedef struct SCIP_DomChgBound SCIP_DOMCHGBOUND; /**< static domain change data for bound changes */
typedef struct SCIP_DomChgBoth SCIP_DOMCHGBOTH;   /**< static domain change data for bound and hole changes */
typedef struct SCIP_DomChgDyn SCIP_DOMCHGDYN;     /**< dynamic domain change data for bound and hole changes */
typedef union SCIP_DomChg SCIP_DOMCHG;            /**< changes in domains of variables */
typedef struct SCIP_BoundChg SCIP_BOUNDCHG;       /**< changes in bounds of variables */
typedef struct SCIP_BdChgIdx SCIP_BDCHGIDX;       /**< bound change index in path from root to current node */
typedef struct SCIP_BdChgInfo SCIP_BDCHGINFO;     /**< bound change information to track bound changes from root to current node */
typedef struct SCIP_BranchingData SCIP_BRANCHINGDATA; /**< data for branching decision bound changes */
typedef struct SCIP_InferenceData SCIP_INFERENCEDATA; /**< data for inferred bound changes */
typedef struct SCIP_HoleChg SCIP_HOLECHG;         /**< changes in holelist of variables */
typedef struct SCIP_Hole SCIP_HOLE;               /**< hole in a domain of an integer variable */
typedef struct SCIP_Holelist SCIP_HOLELIST;       /**< list of holes in a domain of an integer variable */
typedef struct SCIP_Dom SCIP_DOM;                 /**< datastructures for storing domains of variables */
typedef struct SCIP_Original SCIP_ORIGINAL;       /**< original variable information */
typedef struct SCIP_Aggregate SCIP_AGGREGATE;     /**< aggregation information */
typedef struct SCIP_Multaggr SCIP_MULTAGGR;       /**< multiple aggregation information */
typedef struct SCIP_Negate SCIP_NEGATE;           /**< negation information */
typedef struct SCIP_Var SCIP_VAR;                 /**< variable of the problem */
typedef struct SCIP_VarData SCIP_VARDATA;         /**< user variable data */

/** frees user data of original variable (called when the original variable is freed)
 *
 *  This method should free the user data of the original variable.
 *
 *  input:
 *  - scip            : SCIP main data structure
 *  - var             : original variable the data to free is belonging to
 *  - vardata         : pointer to the user variable data to free
 */
#define SCIP_DECL_VARDELORIG(x) SCIP_RETCODE x (SCIP* scip, SCIP_VAR* var, SCIP_VARDATA** vardata)

/** creates transformed variable for original user variable
 *
 *  Because the original variable and the user data of the original variable should not be
 *  modified during the solving process, a transformed variable is created as a copy of
 *  the original variable. If the user variable data is never modified during the solving
 *  process anyways, it is enough to simple copy the user data's pointer. This is the
 *  default implementation, which is used when a NULL is given as VARTRANS method.
 *  If the user data may be modified during the solving process (e.g. during preprocessing),
 *  the VARTRANS method must be given and has to copy the user variable data to a different
 *  memory location.
 *
 *  input:
 *  - scip            : SCIP main data structure
 *  - sourcevar       : original variable
 *  - sourcedata      : source variable data to transform
 *  - targetvar       : transformed variable
 *  - targetdata      : pointer to store created transformed variable data
 */
#define SCIP_DECL_VARTRANS(x) SCIP_RETCODE x (SCIP* scip, SCIP_VAR* sourcevar, SCIP_VARDATA* sourcedata, SCIP_VAR* targetvar, SCIP_VARDATA** targetdata)

/** frees user data of transformed variable (called when the transformed variable is freed)
 *
 *  This method has to be implemented, if the VARTRANS method is not a simple pointer
 *  copy operation like in the default VARTRANS implementation. It should free the
 *  user data of the transformed variable, that was created in the VARTRANS method.
 *
 *  input:
 *  - scip            : SCIP main data structure
 *  - var             : transformed variable the data to free is belonging to
 *  - vardata         : pointer to the user variable data to free
 */
#define SCIP_DECL_VARDELTRANS(x) SCIP_RETCODE x (SCIP* scip, SCIP_VAR* var, SCIP_VARDATA** vardata)

/** copies variable data of source SCIP variable for the target SCIP variable
 *
 *  This method should copy the variable data of the source SCIP and create a target variable data for target
 *  variable. This callback is optimal. If the copying process was successful the target variable gets this variable
 *  data assigned. In case the result pointer is set to SCIP_DIDNOTRUN the target variable will have no variable data at
 *  all.
 *
 *  The variable map and the constraint map can be used via the function SCIPgetVarCopy() and SCIPgetConsCopy(),
 *  respectively, to get for certain variables and constraints of the source SCIP the counter parts in the target
 *  SCIP. You should be very carefully in using these two methods since they could lead to infinity loop.
 *
 *  input:
 *  - scip            : target SCIP data structure
 *  - sourcescip      : source SCIP main data structure
 *  - sourcevar       : variable of the source SCIP
 *  - sourcedata      : variable data of the source variable which should get copied
 *  - varmap,         : a hashmap which stores the mapping of source variables to corresponding target variables
 *  - consmap,        : a hashmap which stores the mapping of source constraints to corresponding target constraints
 *  - targetvar       : variable of the (target) SCIP (targetvar is the copy of sourcevar)
 *  - targetdata      : pointer to store created copy of the variable data for the (target) SCIP
 *
 *  output:
 *  - result          : pointer to store the result of the call
 *
 *  possible return values for *result:
 *  - SCIP_DIDNOTRUN  : the copying process was not performed 
 *  - SCIP_SUCCESS    : the copying process was successfully performed
 */
#define SCIP_DECL_VARCOPY(x) SCIP_RETCODE x (SCIP* scip, SCIP* sourcescip, SCIP_VAR* sourcevar, SCIP_VARDATA* sourcedata, \
      SCIP_HASHMAP* varmap, SCIP_HASHMAP* consmap, SCIP_VAR* targetvar, SCIP_VARDATA** targetdata, SCIP_RESULT* result)

#ifdef __cplusplus
}
#endif

#endif