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<title>Logtalk predicate directive: meta_predicate/1</title>
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<div class="top-left">Logtalk reference manual</div>
<div class="top-right">Predicate directive: meta_predicate/1</div>
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<h2 class="codenp">meta_predicate/1<span id="directives_meta_predicate1"/></h2>
<h4>Description</h4>
<pre>meta_predicate(MetaPredicate)</pre>
<p>
Declares meta-predicates, i.e., predicates that have arguments that will be called as goals. An argument may also be a <em>closure</em> instead of a goal if the meta-predicate uses the <a title="Consult reference manual" href="../methods/call1.html"><code>call/N</code></a> Logtalk built-in methods to construct the actual goal from the closure and the additional arguments.
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<h4>Template and modes</h4>
<pre>meta_predicate(+meta_predicate_mode_indicator)</pre>
<h4>Examples</h4>
<pre>:- meta_predicate(findall(*, ::, *)).
:- meta_predicate(forall(::, ::)).
:- meta_predicate(maplist(2, *, *))</pre>
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