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< title > Logtalk built-in predicate: specializes_class/2-3< / title >
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< a href = "../../index.html" > contents< / a > > < a href = "../index.html" > reference manual< / a > > < a href = "../index.html#builtins" > built-in predicates< / a >
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< h2 > < code > specializes_class/2-3< / code > < / h2 >
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< h4 > Description< / h4 >
< blockquote >
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< pre > specializes_class(Class, Superclass)
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specializes_class(Class, Superclass, Scope)< / pre >
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< p >
Enumerates, by backtracking, all pairs of objects such that the first one specializes the second.
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< h4 > Template and modes< / h4 >
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< pre > specializes_class(?object_identifier, ?object_identifier)
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specializes_class(?object_identifier, ?object_identifier, ?scope)< / pre >
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< h4 > Errors< / h4 >
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< dl >
< dt > Class is neither a variable nor a valid object identifier:< / dt >
< dd > < code > type_error(object_identifier, Class)< / code > < / dd >
< dt > Superclass is neither a variable nor a valid object identifier:< / dt >
< dd > < code > type_error(object_identifier, Superclass)< / code > < / dd >
< dt > Scope is neither a variable nor a valid entity scope:< / dt >
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< dd > < code > type_error(scope, Scope)< / code > < / dd >
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< h4 > Examples< / h4 >
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< pre > | ?- specializes_class(Subclass, state_space).
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| ?- specializes_class(Subclass, state_space, public).< / pre >
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Copyright © < a href = "mailto:pmoura@logtalk.org" > Paulo Moura< / a > — < a href = "http://www.logtalk.org" > Logtalk.org< / a >
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