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<p class="right" id="coroutining-0"><span id="index-0"></span><strong>object</strong></p>
<section id="coroutining">
<h1><code class="docutils literal notranslate"><span class="pre">coroutining</span></code><a class="headerlink" href="#coroutining" title="Link to this heading"></a></h1>
<p>Coroutining predicates.</p>
<div class="line-block">
<div class="line"><strong>Availability:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">logtalk_load(coroutining(loader))</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Author:</strong> Paulo Moura</div>
<div class="line"><strong>Version:</strong> 0:5:0</div>
<div class="line"><strong>Date:</strong> 2021-12-17</div>
</div>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static,</span> <span class="pre">context_switching_calls</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Dependencies:</strong></div>
<div class="line-block">
<div class="line">(none)</div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Remarks:</strong></div>
</div>
<blockquote>
<div><ul class="simple">
<li><p>Supported backend Prolog systems: ECLiPSe, XVM, SICStus Prolog, SWI-Prolog, Trealla Prolog, and YAP.</p></li>
</ul>
</div></blockquote>
<div class="line-block">
<div class="line"><strong>Inherited public predicates:</strong></div>
<div class="line-block">
<div class="line">(none)</div>
</div>
</div>
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<li><p><a class="reference internal" href="#public-predicates" id="id1">Public predicates</a></p>
<ul>
<li><p><a class="reference internal" href="#dif-2" id="id2"><code class="docutils literal notranslate"><span class="pre">dif/2</span></code></a></p></li>
<li><p><a class="reference internal" href="#dif-1" id="id3"><code class="docutils literal notranslate"><span class="pre">dif/1</span></code></a></p></li>
<li><p><a class="reference internal" href="#freeze-2" id="id4"><code class="docutils literal notranslate"><span class="pre">freeze/2</span></code></a></p></li>
<li><p><a class="reference internal" href="#frozen-2" id="id5"><code class="docutils literal notranslate"><span class="pre">frozen/2</span></code></a></p></li>
<li><p><a class="reference internal" href="#when-2" id="id6"><code class="docutils literal notranslate"><span class="pre">when/2</span></code></a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#protected-predicates" id="id7">Protected predicates</a></p></li>
<li><p><a class="reference internal" href="#private-predicates" id="id8">Private predicates</a></p></li>
<li><p><a class="reference internal" href="#operators" id="id9">Operators</a></p></li>
</ul>
</nav>
<section id="public-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Public predicates</a><a class="headerlink" href="#public-predicates" title="Link to this heading"></a></h2>
<section id="dif-2">
<span id="coroutining-0-dif-2"></span><span id="index-1"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">dif/2</span></code></a><a class="headerlink" href="#dif-2" title="Link to this heading"></a></h3>
<p>Sets a constraint that is true iff the two terms are different.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">dif(Term1,Term2)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">dif(+term,+term)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="dif-1">
<span id="coroutining-0-dif-1"></span><span id="index-2"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">dif/1</span></code></a><a class="headerlink" href="#dif-1" title="Link to this heading"></a></h3>
<p>Sets a set of constraints that are true iff all terms in a list are different.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">dif(Terms)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">dif(+list(term))</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="freeze-2">
<span id="coroutining-0-freeze-2"></span><span id="index-3"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">freeze/2</span></code></a><a class="headerlink" href="#freeze-2" title="Link to this heading"></a></h3>
<p>Delays the execution of a goal until a variable is bound.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">freeze(Variable,Goal)</span></code></div>
</div>
<div class="line"><strong>Meta-predicate template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">freeze(*,0)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">freeze(+term,+callable)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_more</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="frozen-2">
<span id="coroutining-0-frozen-2"></span><span id="index-4"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">frozen/2</span></code></a><a class="headerlink" href="#frozen-2" title="Link to this heading"></a></h3>
<p>Unifies <code class="docutils literal notranslate"><span class="pre">Goal</span></code> with the goal delayed by <code class="docutils literal notranslate"><span class="pre">Variable</span></code>. When no goals are frozen on <code class="docutils literal notranslate"><span class="pre">Variable</span></code>, <code class="docutils literal notranslate"><span class="pre">Goal</span></code> is unified with true.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">frozen(Variable,Goal)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">frozen(@var,--callable)</span></code> - <code class="docutils literal notranslate"><span class="pre">one</span></code></div>
</div>
</div>
<hr class="docutils" />
</section>
<section id="when-2">
<span id="coroutining-0-when-2"></span><span id="index-5"></span><h3><a class="toc-backref" href="#contents" role="doc-backlink"><code class="docutils literal notranslate"><span class="pre">when/2</span></code></a><a class="headerlink" href="#when-2" title="Link to this heading"></a></h3>
<p>Calls <code class="docutils literal notranslate"><span class="pre">Goal</span></code> when <code class="docutils literal notranslate"><span class="pre">Condition</span></code> becomes true. The portable conditions are: <code class="docutils literal notranslate"><span class="pre">nonvar/1</span></code>, <code class="docutils literal notranslate"><span class="pre">ground/1</span></code>, <code class="docutils literal notranslate"><span class="pre">(,)/2</span></code>, and <code class="docutils literal notranslate"><span class="pre">(;)/2</span></code>.</p>
<div class="line-block">
<div class="line"><strong>Compilation flags:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">static</span></code></div>
</div>
</div>
<div class="line-block">
<div class="line"><strong>Template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">when(Condition,Goal)</span></code></div>
</div>
<div class="line"><strong>Meta-predicate template:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">when(*,0)</span></code></div>
</div>
<div class="line"><strong>Mode and number of proofs:</strong></div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">when(+callable,+callable)</span></code> - <code class="docutils literal notranslate"><span class="pre">zero_or_more</span></code></div>
</div>
</div>
</section>
</section>
<hr class="docutils" />
<section id="protected-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Protected predicates</a><a class="headerlink" href="#protected-predicates" title="Link to this heading"></a></h2>
<p>(none)</p>
</section>
<section id="private-predicates">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Private predicates</a><a class="headerlink" href="#private-predicates" title="Link to this heading"></a></h2>
<p>(none)</p>
</section>
<section id="operators">
<h2><a class="toc-backref" href="#contents" role="doc-backlink">Operators</a><a class="headerlink" href="#operators" title="Link to this heading"></a></h2>
<p>(none)</p>
</section>
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