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< title > Logtalk control construct: ::/1< / title >
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< a href = "../../index.html" > contents< / a > > < a href = "../index.html" > reference manual< / a > > < a href = "../index.html#constructs" > control constructs< / a >
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< h2 > < code > ::/1< / code > < / h2 >
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< h4 > Description< / h4 >
< blockquote >
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< pre > ::Predicate
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::(Predicate1, Predicate2, ...)
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::(Predicate1; Predicate2; ...)< / pre >
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< p >
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Send a message to < a class = "glossary" title = "Go to glossary definition" href = "../../glossary.html#self" > self< / a > . Only used in the body of a predicate definition. The argument should match a public or protected predicate of < a class = "glossary" title = "Go to glossary definition" href = "../../glossary.html#self" > self< / a > . It may also match a private predicate if the predicate is imported from a category, if used from inside a category, or when using private inheritance. We can also send a set of messages to self. The "< code > ,< / code > " and "< code > ;< / code > " in the list have the usual Prolog meaning.
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< / p >
< / blockquote >
< h4 > Template and modes< / h4 >
< blockquote >
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< pre > ::+messages< / pre >
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< / blockquote >
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< h4 > Errors< / h4 >
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< blockquote >
< dl >
< dt > Predicate is a variable:< / dt >
< dd > < code > instantiation_error< / code > < / dd >
< dt > Predicate is declared private:< / dt >
< dd > < code > permission_error(access, private_predicate, Predicate)< / code > < / dd >
< dt > Predicate is not declared:< / dt >
< dd > < code > existence_error(predicate_declaration, Predicate)< / code > < / dd >
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< / blockquote >
< h4 > Examples< / h4 >
< blockquote >
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< pre > area(Area) :-
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::width(Width),
::height(Height),
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Area is Width*Height.< / 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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