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< title > Logtalk built-in predicate: implements_protocol/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 > implements_protocol/2-3< / code > < / h2 >
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< h4 > Description< / h4 >
< blockquote >
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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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< h4 > Template and modes< / h4 >
< blockquote >
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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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< / blockquote >
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< h4 > Errors< / h4 >
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< dl >
< 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 >
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< dd > < code > type_error(scope, Scope)< / code > < / dd >
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< / dl >
< / blockquote >
< h4 > Examples< / h4 >
< blockquote >
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< pre > | ?- implements_protocol(List, listp).
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| ?- implements_protocol(List, listp, public).< / pre >
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< a href = "extends_protocol2_3.html" > previous< / a > | < a href = "../../glossary.html" > glossary< / a > | < a href = "imports_category2_3.html" > next< / a >
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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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