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<title>Logtalk built-in predicate: forall/2</title>
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<div class="top-left">Logtalk reference manual</div>
<div class="top-right">Built-in predicate: forall/2</div>
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<h2 class="code">forall/2</h2>
<h4>Description</h4>
<pre>forall(Generator, Test)</pre>
<p>
This predicate is true if, for all solutions of Generator, Test is true (some Prolog compilers already define this or a similar predicate).
</p>
<h4>Template and modes</h4>
<pre>forall(+callable, +callable)</pre>
<h4>Errors</h4>
<dl class="errors">
<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>
</dl>
<h4>Examples</h4>
<pre>| ?- forall(member(X, [1, 2, 3]), write(X)).
123
yes</pre>
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<span class="date">Last updated on: November 16, 2005</span>
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