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< title > Logtalk control construct: ::/2< / title >
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< div class = "top-left" > Logtalk reference manual< / div >
< div class = "top-right" > Control construct: ::/2< / 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#constructs" > control constructs< / a > < / div >
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< h2 id = "control_to_object2" class = "codenp" > ::/2< / h2 >
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< h4 > Description< / h4 >
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< pre > Object::Predicate
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(Object1, Object2, ...)::Predicate
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(Object1; Object2; ...)::Predicate
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Object::(Predicate1, Predicate2, ...)
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Object::(Predicate1; Predicate2; ...)< / pre >
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< p >
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Sends a message to an object. The message argument must match a public predicate of the receiver object. We can also send the same message to a set of objects or a set of messages to the same object. The "< code > ,< / code > " and "< code > ;< / code > " in the list have the usual Prolog meaning.
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< / p >
< h4 > Template and modes< / h4 >
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< pre > +receivers::+messages< / pre >
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< h4 > Errors< / h4 >
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< dl >
< dt > Either Object or 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 declared protected:< / dt >
< dd > < code > permission_error(access, protected_predicate, Predicate)< / code > < / dd >
< dt > Predicate is not declared:< / dt >
< dd > < code > existence_error(predicate_declaration, Predicate)< / code > < / dd >
< dt > Object does not exist:< / dt >
< dd > < code > existence_error(object, Object)< / code > < / dd >
< / dl >
< h4 > Examples< / h4 >
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< pre > | ?- list::member(X, [1, 2, 3]).
X = 1 ;
X = 2 ;
X = 3
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yes< / 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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