FD variable information

9.5 FD variable information

These predicate allow the user to get some information about FD variables. They are not constraints, they only return the current state of a variable.

9.5.1 fd_min/2, fd_max/2, fd_size/2, fd_dom/2

Templates

: fd_min(+fd_variable, ?integer)
fd_max(+fd_variable, ?integer)
fd_size(+fd_variable, ?integer)
fd_dom(+fd_variable, ?integer_list)

Description

fd_min(X, N) succeeds if N is the minimal value of the current domain of X.

fd_max(X, N) succeeds if N is the maximal value of the current domain of X.

fd_size(X, N) succeeds if N is the number of elements of the current domain of X.

fd_dom(X, Values) succeeds if Values is the list of values of the current domain of X.

Errors


X is a variable		instantiation_error

X is neither an FD variable nor an integer		type_error(fd_variable, X)

N is neither a variable nor an integer		type_error(integer, N)

an element E of the Vars list is neither a variable nor an FD variable nor an integer		type_error(fd_variable, E)

Values is neither a partial list nor a list		type_error(list, Values)

Portability

GNU Prolog predicate.

9.5.2 fd_has_extra_cstr/1, fd_has_vector/1, fd_use_vector/1

Templates

: fd_has_extra_cstr(+fd_variable)
fd_has_vector(+fd_variable)
fd_use_vector(+fd_variable)

Description

fd_has_extra_cstr(X) succeeds if the extra_cstr of X is currently on (section 9.1).

fd_has_vector(X) succeeds if the current domain of X uses a sparse representation (section 9.1).

fd_use_vector(X) enforces a sparse representation for the domain of X (section 9.1).

Errors


X is a variable		instantiation_error

X is neither an FD variable nor an integer		type_error(fd_variable, X)

Portability

GNU Prolog predicates.