153 lines
7.4 KiB
HTML
153 lines
7.4 KiB
HTML
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<meta name="description" content="API docs for the hashCode property from the MinMaxZoomPreference class, for the Dart programming language.">
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<title>hashCode property - MinMaxZoomPreference class - amap_map library - Dart API</title>
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<li><a href="../../index.html">amap_map</a></li>
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<li><a href="../../amap_map/amap_map-library.html">amap_map</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference-class.html">MinMaxZoomPreference</a></li>
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<li class="self-crumb">hashCode property</li>
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<div class="self-name">hashCode</div>
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<li><a href="../../amap_map/MinMaxZoomPreference-class.html">MinMaxZoomPreference</a></li>
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<li class="self-crumb">hashCode property</li>
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</ol>
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<h5>MinMaxZoomPreference class</h5>
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<ol>
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<li class="section-title"><a href="../../amap_map/MinMaxZoomPreference-class.html#constructors">Constructors</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/MinMaxZoomPreference.html">MinMaxZoomPreference</a></li>
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<li class="section-title">
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<a href="../../amap_map/MinMaxZoomPreference-class.html#instance-properties">Properties</a>
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</li>
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<li><a href="../../amap_map/MinMaxZoomPreference/hashCode.html">hashCode</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/maxZoom.html">maxZoom</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/minZoom.html">minZoom</a></li>
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<li class="inherited"><a href="https://api.flutter.dev/flutter/dart-core/Object/runtimeType.html">runtimeType</a></li>
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<li class="section-title"><a href="../../amap_map/MinMaxZoomPreference-class.html#instance-methods">Methods</a></li>
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<li class="inherited"><a href="https://api.flutter.dev/flutter/dart-core/Object/noSuchMethod.html">noSuchMethod</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/toJson.html">toJson</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/toString.html">toString</a></li>
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<li class="section-title"><a href="../../amap_map/MinMaxZoomPreference-class.html#operators">Operators</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a></li>
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<li class="section-title"><a href="../../amap_map/MinMaxZoomPreference-class.html#constants">Constants</a></li>
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<li><a href="../../amap_map/MinMaxZoomPreference/defaultPreference-constant.html">defaultPreference</a></li>
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<div id="dartdoc-main-content" class="col-xs-12 col-sm-9 col-md-8 main-content">
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<div><h1><span class="kind-property">hashCode</span> property </h1></div>
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<section id="getter">
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<section class="multi-line-signature">
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<span class="returntype"><a href="https://api.flutter.dev/flutter/dart-core/int-class.html">int</a></span>
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<span class="name ">hashCode</span>
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<div class="features">override</div>
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</section>
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<section class="desc markdown">
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<p>The hash code for this object.</p>
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<p>A hash code is a single integer which represents the state of the object
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that affects <a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a> comparisons.</p>
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<p>All objects have hash codes.
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The default hash code represents only the identity of the object,
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the same way as the default <a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a> implementation only considers objects
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equal if they are identical (see <a href="https://api.flutter.dev/flutter/dart-core/identityHashCode.html">identityHashCode</a>).</p>
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<p>If <a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a> is overridden to use the object state instead,
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the hash code must also be changed to represent that state.</p>
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<p>Hash codes must be the same for objects that are equal to each other
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according to <a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a>.
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The hash code of an object should only change if the object changes
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in a way that affects equality.
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There are no further requirements for the hash codes.
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They need not be consistent between executions of the same program
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and there are no distribution guarantees.</p>
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<p>Objects that are not equal are allowed to have the same hash code,
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it is even technically allowed that all instances have the same hash code,
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but if clashes happen too often, it may reduce the efficiency of hash-based
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data structures like <a href="https://api.flutter.dev/flutter/dart-collection/HashSet-class.html">HashSet</a> or <a href="https://api.flutter.dev/flutter/dart-collection/HashMap-class.html">HashMap</a>.</p>
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<p>If a subclass overrides <a href="../../amap_map/MinMaxZoomPreference/hashCode.html">hashCode</a>, it should override the
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<a href="../../amap_map/MinMaxZoomPreference/operator_equals.html">operator ==</a> operator as well to maintain consistency.</p>
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</section>
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<section class="summary source-code" id="source">
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<h2><span>Implementation</span></h2>
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<pre class="language-dart"><code class="language-dart">@override
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int get hashCode => hashValues(minZoom, maxZoom);</code></pre>
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</section>
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</section>
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