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<section class="section">
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<div class="section-content top-matter">
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<h1 id='capture-variable' class='heading'>Capture Variable</h1>
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<p>Non-constant variables should not be listed in a closure’s capture list to avoid confusion about closures capturing variables at creation time</p>
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<ul>
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<li><strong>Identifier:</strong> capture_variable</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> Yes</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> warning</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="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
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<span class="k">let</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span>
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<span class="nf">init</span><span class="p">(</span><span class="n">_</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span> <span class="k">self</span><span class="o">.</span><span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="p">}</span>
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<span class="p">}</span>
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<span class="k">let</span> <span class="nv">j</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
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<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="kt">C</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
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<span class="k">let</span> <span class="nv">closure</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="p">[</span><span class="n">j</span><span class="p">,</span> <span class="n">c</span><span class="p">]</span> <span class="k">in</span>
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<span class="nf">print</span><span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="nf">closure</span><span class="p">()</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">iGlobal</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
|
||
<span class="kd">class</span> <span class="k">var</span> <span class="nv">iClass</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="mi">0</span> <span class="p">}</span>
|
||
<span class="kd">static</span> <span class="k">let</span> <span class="nv">iStatic</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
<span class="k">let</span> <span class="nv">iInstance</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="kd">func</span> <span class="nf">callTest</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="k">var</span> <span class="nv">iLocal</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
<span class="n">test</span> <span class="p">{</span> <span class="p">[</span><span class="k">unowned</span> <span class="k">self</span><span class="p">,</span> <span class="n">iGlobal</span><span class="p">,</span> <span class="n">iInstance</span><span class="p">,</span> <span class="n">iLocal</span><span class="p">,</span> <span class="n">iClass</span><span class="o">=</span><span class="kt">C</span><span class="o">.</span><span class="n">iClass</span><span class="p">,</span> <span class="n">iStatic</span><span class="o">=</span><span class="kt">C</span><span class="o">.</span><span class="n">iStatic</span><span class="p">]</span> <span class="n">j</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">iGlobal</span><span class="p">,</span> <span class="n">iClass</span><span class="p">,</span> <span class="n">iStatic</span><span class="p">,</span> <span class="n">iInstance</span><span class="p">,</span> <span class="n">iLocal</span><span class="p">,</span> <span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kd">func</span> <span class="nf">test</span><span class="p">(</span><span class="n">_</span> <span class="nv">completionHandler</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">j</span><span class="p">:</span> <span class="kt">Int</span><span class="o">!</span>
|
||
<span class="n">j</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="k">let</span> <span class="nv">closure</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
<span class="n">j</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">lazy</span> <span class="k">var</span> <span class="nv">j</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span> <span class="p">}()</span>
|
||
|
||
<span class="k">let</span> <span class="nv">closure</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
<span class="n">j</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">j</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="k">let</span> <span class="nv">closure</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
<span class="n">j</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span>
|
||
<span class="nf">init</span><span class="p">(</span><span class="n">_</span> <span class="nv">i</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span> <span class="k">self</span><span class="o">.</span><span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="k">var</span> <span class="nv">c</span> <span class="o">=</span> <span class="kt">C</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
|
||
<span class="k">let</span> <span class="nv">closure</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="p">[</span><span class="n">c</span><span class="p">]</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">i</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
<span class="n">c</span> <span class="o">=</span> <span class="kt">C</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
|
||
<span class="nf">closure</span><span class="p">()</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">iGlobal</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">callTest</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="n">test</span> <span class="p">{</span> <span class="p">[</span><span class="n">iGlobal</span><span class="p">]</span> <span class="n">j</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">iGlobal</span><span class="p">,</span> <span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kd">func</span> <span class="nf">test</span><span class="p">(</span><span class="n">_</span> <span class="nv">completionHandler</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
|
||
<span class="kd">static</span> <span class="k">var</span> <span class="nv">iStatic</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="kd">static</span> <span class="kd">func</span> <span class="nf">callTest</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="n">test</span> <span class="p">{</span> <span class="p">[</span><span class="err">↓</span><span class="n">iStatic</span><span class="p">]</span> <span class="n">j</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">iStatic</span><span class="p">,</span> <span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kd">static</span> <span class="kd">func</span> <span class="nf">test</span><span class="p">(</span><span class="n">_</span> <span class="nv">completionHandler</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="nf">completionHandler</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
|
||
<span class="kt">C</span><span class="o">.</span><span class="n">iStatic</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="nf">completionHandler</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kt">C</span><span class="o">.</span><span class="nf">callTest</span><span class="p">()</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">C</span> <span class="p">{</span>
|
||
<span class="k">var</span> <span class="nv">iInstance</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">0</span>
|
||
|
||
<span class="kd">func</span> <span class="nf">callTest</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="n">test</span> <span class="p">{</span> <span class="p">[</span><span class="n">iInstance</span><span class="p">]</span> <span class="n">j</span> <span class="k">in</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">iInstance</span><span class="p">,</span> <span class="n">j</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
|
||
<span class="kd">func</span> <span class="nf">test</span><span class="p">(</span><span class="n">_</span> <span class="nv">completionHandler</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</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>
|
||
</section>
|
||
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|
||
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|