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?E in ?Sterm

E belongs to the set term Sterm.
?E
A Prolog term.
?Sterm
A set term.

Description

This constraint states that E belongs to the set term Sterm. If E is not a known value the constraint is delayed. It is activated as soon as E becomes a known value. If Sterm is a ground set and E is known it checks if E belongs to Sterm.

Fail Conditions

Fails if E cannot belong to Sterm.

Resatisfiable

No.

Examples

[eclipse 4]: S `:: {}.. {1,2,3}, E in S.

E = E
S = S{{} .. {1, 2, 3}}

Delayed goals:
        E in_s S{{} .. {1, 2, 3}}
yes.

[eclipse 5]: S `:: {}.. {1,2,3}, 1 in S.

S = S{{1} .. {1, 2, 3}}
yes.

See Also

`:: / 2, notin / 2