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<title>Logtalk built-in method: forall/2</title>
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<h2><code>forall/2</code></h2>
<h4>Description</h4>
<blockquote>
<pre>forall(Generator, Test)</pre>
<p>
For all solutions of <code>Generator</code>, <code>Test</code> is true.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>forall(+callable, +callable)</pre>
</blockquote>
<h4>Errors</h4>
<blockquote>
<dl>
<dt>Either Generator or Test is a variable:</dt>
<dd><code>instantiation_error</code></dd>
<dt>Generator is neither a variable nor a callable term:</dt>
<dd><code>type_error(callable, Generator)</code></dd>
<dt>Test is neither a variable nor a callable term:</dt>
<dd><code>type_error(callable, Test)</code></dd>
</dl>
</blockquote>
<h4>Examples</h4>
<blockquote>
<dl>
<dt>To call both goals in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#this">this</a>:</dt>
<dd><code>forall(Generator, Test)</code></dd>
<dt>To call both goals in <a class="glossary" title="Go to glossary definition" href="../../glossary.html#self">self</a>:</dt>
<dd><code>forall(::Generator, ::Test)</code></dd>
<dt>To call both goals in an object:</dt>
<dd><code>forall(Object::Generator, Object::Test)</code></dd>
</dl>
</blockquote>
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