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yap-6.3/Logtalk/manuals/refman/directives/op3.html
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<h2><code>op/3</code></h2>
<h4>Description</h4>
<blockquote>
<pre>op(Precedence, Associativity, Operator)</pre>
<p>
Declares operators. Operators declared inside objects and categories have local scope.
</p>
</blockquote>
<h4>Template and modes</h4>
<blockquote>
<pre>op(+integer, +associativity, +atom_or_atom_list)</pre>
</blockquote>
<h4>Examples</h4>
<blockquote>
<pre>:- op(950, fx, +).
:- op(950, fx, ?).
:- op(950, fx, @).
:- op(950, fx, -).</pre>
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