constraints.h
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extern int _fd_constraint_count;
extern fd_constraint _fd_constraints[];
#define CONSTRAINT(v,c) _fd_constraints[(v)->constraints[c]]
typedef enum {
FD_CONSTR_NE = 0,
FD_CONSTR_EQ,
FD_CONSTR_LT,
FD_CONSTR_GT = FD_CONSTR_LT, // XXX: is this standard C?
FD_CONSTR_LE,
FD_CONSTR_GE = FD_CONSTR_LE, // XXX: is this standard C?
FD_CONSTR_MINUS_NE,
FD_CONSTR_MINUS_EQ,
FD_CONSTR_PLUS_GT,
FD_CONSTR_VAR_EQ_MINUS,
FD_CONSTR_ALL_DIFFERENT,
FD_CONSTR_EXACTLY_ONE,
FD_CONSTR_NOGOODS,
FD_CONSTR_EXACTLY,
FD_CONSTR_EXACTLY_VAR,
FD_CONSTR_SUM,
FD_CONSTR_VAR_EQ_TIMES,
FD_CONSTR_SUM_PROD,
FD_CONSTR_ELEMENT,
FD_CONSTR_KNAPSACK2,
FD_CONSTR_SUM2,
FD_CONSTR_MIN,
FD_CONSTR_MAX,
FD_CONSTR_POLY_EQ,
FD_CONSTR_ELEMENT_VAR,
FD_CONSTR_EXACTLY_VARS,
FD_CONSTR_POLY_EQ_K,
FD_CONSTR_POLY_NE,
FD_CONSTR_POLY_NE_K,
FD_CONSTR_POLY_LE_K,
FD_CONSTR_KINDS // number of kinds of constraints
} _fd_constraint_kind;
typedef struct _fd_constraint_class {
int (*propagator2)(fd_constraint, fd_int);
// propagates changes in a variable's
// domain; 2nd argument is the variable
// against which to revise the domains of
// the other variables in the constraint;
// returns FD_NOSOLUTION if some domain
// becomes empty, and FD_OK otherwise
int (*filter)(fd_constraint);
// performs an initial filtering of the
// domains of the constraint variables
} _fd_constraint_class;
extern _fd_constraint_class _fd_constraint_data[];
#define _fd_propagate(c,v) (_fd_constraint_data[(c)->kind].propagator2(c, v))
#define _fd_filter(c) (_fd_constraint_data[(c)->kind].filter(c))
void fd__init_constraints();
#if defined(CONSTRAINT_TEMPS) || !defined(DISABLE_ENTAILED)
#define CONSTRAINTS_HAVE_STATE 1
#endif
#ifdef CONSTRAINTS_HAVE_STATE
void fd__constraint_data_reset(void);
#else
#define fd__constraint_data_reset() ((void) 0)
#endif
#ifndef DISABLE_ENTAILED
int fd__constraint_entailed(fd_constraint);
#else
#define fd__constraint_entailed(_) 0
#endif