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<section class="section">
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<div class="section-content top-matter">
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<h1 id='unhandled-throwing-task' class='heading'>Unhandled Throwing Task</h1>
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<p>Errors thrown inside this task are not handled, which may be unexpected. Handle errors inside the task, or use <code>try await</code> to access the Tasks value and handle errors. See this forum thread for more details: <a href="https://forums.swift.org/t/task-initializer-with-throwing-closure-swallows-error/56066">https://forums.swift.org/t/task-initializer-with-throwing-closure-swallows-error/56066</a></p>
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<ul>
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<li><strong>Identifier:</strong> unhandled_throwing_task</li>
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<li><strong>Enabled by default:</strong> No</li>
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<li><strong>Supports autocorrection:</strong> No</li>
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<li><strong>Kind:</strong> lint</li>
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<li><strong>Analyzer rule:</strong> No</li>
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<li><strong>Minimum Swift compiler version:</strong> 5.0.0</li>
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<li><strong>Default configuration:</strong> error</li>
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</ul>
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<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
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<pre class="highlight swift"><code><span class="kt">Task</span><span class="o"><</span><span class="kt">Void</span><span class="p">,</span> <span class="kt">Never</span><span class="o">></span> <span class="p">{</span>
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<span class="k">try</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
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<span class="p">}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kt">Task</span> <span class="p">{</span>
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<span class="k">try</span><span class="p">?</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
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<span class="p">}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kt">Task</span> <span class="p">{</span>
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<span class="k">try!</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
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<span class="p">}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kt">Task</span><span class="o"><</span><span class="kt">Void</span><span class="p">,</span> <span class="kt">String</span><span class="o">></span> <span class="p">{</span>
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<span class="k">let</span> <span class="nv">text</span> <span class="o">=</span> <span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
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<span class="k">return</span> <span class="n">text</span>
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<span class="p">}</span>
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</code></pre>
|
||
<pre class="highlight swift"><code><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="k">let</span> <span class="nv">e</span> <span class="p">{</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">someFunction</span><span class="p">()</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="nf">anotherFunction</span><span class="p">()</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="p">{</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">error</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="k">try</span> <span class="nf">something</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">task</span> <span class="o">=</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">task</span> <span class="o">=</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">try</span> <span class="k">await</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span><span class="o">.</span><span class="n">value</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">executor</span><span class="o">.</span><span class="n">task</span> <span class="o">=</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">isolatedOpen</span><span class="p">(</span><span class="o">.</span><span class="nf">init</span><span class="p">(</span><span class="n">executor</span><span class="o">.</span><span class="nf">asUnownedSerialExecutor</span><span class="p">()))</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">result</span> <span class="o">=</span> <span class="k">await</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">CancellationError</span><span class="p">()</span>
|
||
<span class="p">}</span><span class="o">.</span><span class="n">result</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">makeTask</span><span class="p">()</span> <span class="o">-></span> <span class="kt">Task</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">Error</span><span class="o">></span> <span class="p">{</span>
|
||
<span class="k">return</span> <span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">someThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">makeTask</span><span class="p">()</span> <span class="o">-></span> <span class="kt">Task</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">Error</span><span class="o">></span> <span class="p">{</span>
|
||
<span class="c1">// Implicit return</span>
|
||
<span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">someThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">return</span> <span class="kt">Result</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">someThrowingFunc</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">text</span> <span class="o">=</span> <span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="k">return</span> <span class="n">text</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">myThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="k">let</span> <span class="nv">e</span> <span class="k">as</span> <span class="kt">FooError</span> <span class="p">{</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">FooError</span><span class="o">.</span><span class="n">bar</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">FooError</span><span class="o">.</span><span class="n">bar</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span><span class="o"><</span><span class="n">_</span><span class="p">,</span> <span class="n">_</span><span class="o">></span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">FooError</span><span class="o">.</span><span class="n">bar</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span><span class="o"><</span><span class="kt">Void</span><span class="p">,</span><span class="n">_</span><span class="o">></span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">FooError</span><span class="o">.</span><span class="n">bar</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">bar</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">do</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="k">catch</span> <span class="p">{</span>
|
||
<span class="k">throw</span> <span class="kt">BarError</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">doTask</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="err">↓</span><span class="kt">Task</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">someThrowingFunction</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
</section>
|
||
|
||
|
||
</article>
|
||
</div>
|
||
<section class="footer">
|
||
<p>© 2023 <a class="link" href="https://jpsim.com" target="_blank" rel="external noopener">JP Simard</a> under MIT.</p>
|
||
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external noopener">jazzy ♪♫ v0.14.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external noopener">Realm</a> project.</p>
|
||
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|
||
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|
||
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|