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symbol_domain_index(?X, -Domain, -Index)

Map a symbolic domain variable/value to integer variable/value
X
domain variable or value
Domain
Variable, will be bound to a pair Module:DomainName
Index
Variable, will be bound to integer or integer variable

Description

Low-level primitive: For a domain variable or domain value, return the corresponding domain name and an integer or integer variable reflecting the corresponding integer index within the domain order.

Modules

This predicate is sensitive to its module context (tool predicate, see @/2).

Fail Conditions

X is neither a symbolic domain variable nor a domain constant

Examples

    ?- symbol_domain_index(we, D, I).
    D = eclipse:weekday
    I = 3
    Yes (0.00s cpu)

    ?- X &:: weekday, X &\= we, symbol_domain_index(X, D, I).
    X = X{[mo, tu, th, fr, sa, su]}
    D = eclipse:weekday
    I = I{[1, 2, 4 .. 7]}
    Yes (0.00s cpu)
    

See Also

symbols_domain_indices / 3, &:: / 2, domain / 1, domain_index / 3