type_var.h

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/*         SCIP --- Solving Constraint Integer Programs                      */
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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"
 */

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#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,         /**< continuous variable with optional integrality restriction:
                                             assigning a fractional value for the variable is feasible and the solver will not enforce
                                             integrality for this variable, but it may treat the variable as if an additional integrality
                                             restriction exists in certain cases, e.g., during boundtightening;
                                             typically, this variable type is used for implicit integer variables, that is, variables which
                                             are known to take an integral value in a feasible or optimal solution due to other constraints or
                                             optimality conditions */
   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