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< title > Logtalk built-in predicate: forall/2< / 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 > forall/2< / code > < / h2 >
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< h4 > Description< / h4 >
< blockquote >
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< pre > forall(Generator, Test)< / pre >
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< p >
This predicate is true if, for all solutions of Generator, Test is true (some Prolog compilers already define this or a similar predicate).
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< h4 > Template and modes< / h4 >
< blockquote >
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< pre > forall(+callable, +callable)< / pre >
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< / blockquote >
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< h4 > Errors< / h4 >
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< dl >
< dt > Generator is not a callable term:< / dt >
< dd > < code > type_error(callable, Generator)< / code > < / dd >
< dt > Test is not a callable term:< / dt >
< dd > < code > type_error(callable, Test)< / code > < / dd >
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< / blockquote >
< h4 > Examples< / h4 >
< blockquote >
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< pre > | ?- forall(member(X, [1, 2, 3]), write(X)).
123
yes< / 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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