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65 lines
2.1 KiB
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65 lines
2.1 KiB
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<title>Logtalk built-in predicate: forall/2</title>
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<div class="top-left">Logtalk reference manual</div>
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<div class="top-right">Built-in predicate: forall/2</div>
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<div class="bottom-right"><span class="page"/></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_forall2" class="codenp">forall/2</h2>
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<h4>Description</h4>
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<pre>forall(Generator, Test)</pre>
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<p>
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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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</p>
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<h4>Template and modes</h4>
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<pre>forall(+callable, +callable)</pre>
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<h4>Errors</h4>
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<dl>
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<dt>Generator is not a callable term:</dt>
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<dd><code>type_error(callable, Generator)</code></dd>
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<dt>Test is not a callable term:</dt>
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<dd><code>type_error(callable, Test)</code></dd>
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</dl>
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<h4>Examples</h4>
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<pre>| ?- forall(member(X, [1, 2, 3]), write(X)).
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123
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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/>
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<span>Last updated on: October 26, 2006</span>
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