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< title > Logtalk built-in predicate: implements_protocol/2-3< / title >
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< div class = "top-left" > Logtalk reference manual< / div >
< div class = "top-right" > Built-in predicate: implements_protocol/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 id = "builtins_implements_protocol2_3" class = "codenp" > implements_protocol/2-3< / h2 >
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< h4 > Description< / h4 >
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< pre > implements_protocol(Object, Protocol)
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implements_protocol(Category, Protocol)
implements_protocol(Object, Protocol, Scope)
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implements_protocol(Category, Protocol, Scope)< / pre >
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< p >
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Enumerates, by backtracking, all pairs of entities such that an object or a category implements a protocol. 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 > implements_protocol(?object_identifier, ?protocol_identifier)
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implements_protocol(?category_identifier, ?protocol_identifier)
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implements_protocol(?object_identifier, ?protocol_identifier, ?scope)
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implements_protocol(?category_identifier, ?protocol_identifier, ?scope)< / pre >
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< h4 > Errors< / h4 >
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< dl >
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< dt > Object is neither a variable nor a valid object identifier:< / dt >
< dd > < code > type_error(object_identifier, Object)< / code > < / dd >
< dt > Category is neither a variable nor a valid category identifier:< / dt >
< dd > < code > type_error(category_identifier, Category)< / code > < / dd >
< dt > Protocol is neither a variable nor a valid protocol identifier:< / dt >
< dd > < code > type_error(protocol_identifier, Protocol)< / 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 > | ?- implements_protocol(List, listp).
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| ?- implements_protocol(List, listp, public).< / pre >
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< span > Copyright © < a href = "mailto:pmoura@logtalk.org" > Paulo Moura< / a > — < a href = "http://logtalk.org" > Logtalk.org< / a > < / span > < br / >
< span > Last updated on: October 26, 2006< / span >
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