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< title > Logtalk built-in predicate: specializes_class/2-3< / title >
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< div class = "top-left" > Logtalk reference manual< / div >
< div class = "top-right" > Built-in predicate: specializes_class/2-3< / div >
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< div class = "navtop" > < a href = "../../index.html" > contents< / a > > < a href = "../index.html" > reference manual< / a > > < a href = "../index.html#builtins" > built-in predicates< / a > < / div >
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< h2 class = "code" > specializes_class/2-3< / h2 >
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< h4 > Description< / h4 >
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< pre > specializes_class(Class, Superclass)
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specializes_class(Class, Superclass, Scope)< / pre >
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< p >
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Enumerates, by backtracking, all pairs of objects such that the first one specializes the second. The relation scope is represented by the atoms < code > public< / code > , < code > protected< / code > , and < code > private< / code > .
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< / p >
< 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 class = "errors" >
< 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 >
< dd > < code > type_error(scope, Scope)< / code > < / dd >
< / dl >
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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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< div class = "navbottom" > < a href = "instantiates_class2_3.html" > previous< / a > | < a href = "../../glossary.html" > glossary< / a > | < a href = "../index.html#builtins" > next< / a > < / div >
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< span class = "date" > Last updated on: November 16, 2005< / span >
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