120 lines
11 KiB
Markdown
120 lines
11 KiB
Markdown
---
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layout: default
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title: "Objects"
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parent: Composite
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ancestor: Funcons-beta
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---
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[Funcons-beta] : [Objects.cbs]
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-----------------------------
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### Objects
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<div class="highlighter-rouge"><pre class="highlight"><code>[
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<i class="keyword">Datatype</i> <span class="name"><a href="#Name_objects">objects</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object">object</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-identity">object-identity</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-class-name">object-class-name</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-feature-map">object-feature-map</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-subobject-sequence">object-subobject-sequence</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-tree">object-tree</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_object-single-inheritance-feature-map">object-single-inheritance-feature-map</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Datatype</i>
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<span class="name"><span id="Name_objects">objects</span></span> ::= <span id="Name_object">object</span>(_:<span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>, _:<span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>)</code></pre></div>
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<code><span class="name"><a href="#Name_object">object</a></span>( <i class="var">A</i>, <i class="var">C</i>, <i class="var">Env</i>, <i class="var">O<sup class="sup">*</sup></i>)</code> is an object:
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* distinguished by an atom <code><i class="var">A</i></code>,
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* of a class named <code><i class="var">C</i></code>,
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* with an environment <code><i class="var">Env</i></code> with the features of the object, and
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* a sequence <code><i class="var">O<sup class="sup">*</sup></i></code> of subobjects of the direct superclasses of <code><i class="var">C</i></code>.
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<code><span class="name"><a href="#Name_object">object</a></span>( <i class="var">A</i>, <i class="var">C</i>, <i class="var">Env</i>)</code> is an object of a base class.
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<code><span class="name"><a href="#Name_object">object</a></span>( <i class="var">A</i>, <i class="var">C</i>, <i class="var">Env</i>, <i class="var">O′</i>)</code> is an object of a class with a single superclass.
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With multiple inheritance, subobjects due to repeated inheritance of the
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same class may be shared.
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Implementations of objects generally represent an object as a vector of
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fields, and use pointers and offsets for efficient access to individual
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fields. The representation of objects used in this specification is
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independent of such implementation concerns.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-identity">object-identity</span></span>(_:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_object-identity">object-identity</a></span>
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<span class="name"><a href="#Name_object">object</a></span>(<span id="Variable326_A"><i class="var">A</i></span>:<span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>, _*:<span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>) ~> <a href="#Variable326_A"><i class="var">A</i></a></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-class-name">object-class-name</span></span>(_:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_object-class-name">object-class-name</a></span>
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<span class="name"><a href="#Name_object">object</a></span>(_:<span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>, <span id="Variable405_C"><i class="var">C</i></span>:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>, _*:<span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>) ~> <a href="#Variable405_C"><i class="var">C</i></a></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-feature-map">object-feature-map</span></span>(_:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_object-feature-map">object-feature-map</a></span>
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<span class="name"><a href="#Name_object">object</a></span>(_:<span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>, <span id="Variable484_Env"><i class="var">Env</i></span>:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>, _*:<span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>) ~> <a href="#Variable484_Env"><i class="var">Env</i></a></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-subobject-sequence">object-subobject-sequence</span></span>(_:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_object-subobject-sequence">object-subobject-sequence</a></span>
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<span class="name"><a href="#Name_object">object</a></span>(_:<span class="name"><a href="../../../Computations/Normal/Generating/index.html#Name_atoms">atoms</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_identifiers">identifiers</a></span>, _:<span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>, <span id="Variable566_O*"><i class="var">O<sup class="sup">*</sup></i></span>:<span class="name"><a href="#Name_objects">objects</a></span><sup class="sup">*</sup>) ~> <a href="#Variable566_O*"><i class="var">O<sup class="sup">*</sup></i></a></code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-tree">object-tree</span></span>(_:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="../Trees/index.html#Name_trees">trees</a></span>(<span class="name"><a href="#Name_objects">objects</a></span>)</code></pre></div>
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<code><span class="name"><a href="#Name_object-tree">object-tree</a></span> <i class="var">O</i></code> forms a tree where the branches are the object trees for
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the direct subobjects of <code><i class="var">O</i></code>.
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Rule</i>
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<span class="name"><a href="#Name_object-tree">object-tree</a></span>(<span id="Variable657_O"><i class="var">O</i></span>:<span class="name"><a href="#Name_objects">objects</a></span>)
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~> <span class="name"><a href="../Trees/index.html#Name_tree">tree</a></span>(<a href="#Variable657_O"><i class="var">O</i></a>,
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<span class="name"><a href="../../../Computations/Normal/Giving/index.html#Name_interleave-map">interleave-map</a></span> (
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<span class="name"><a href="#Name_object-tree">object-tree</a></span> <span class="name"><a href="../../../Computations/Normal/Giving/index.html#Name_given">given</a></span>,
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<span class="name"><a href="#Name_object-subobject-sequence">object-subobject-sequence</a></span> <a href="#Variable657_O"><i class="var">O</i></a>))</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Funcon</i>
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<span class="name"><span id="Name_object-single-inheritance-feature-map">object-single-inheritance-feature-map</span></span>(<span id="Variable707_O"><i class="var">O</i></span>:<span class="name"><a href="#Name_objects">objects</a></span>) : =><span class="name"><a href="../../../Computations/Normal/Binding/index.html#Name_environments">environments</a></span>
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~> <span class="name"><a href="../Maps/index.html#Name_map-override">map-override</a></span> <span class="name"><a href="../../../Computations/Normal/Giving/index.html#Name_left-to-right-map">left-to-right-map</a></span>(
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<span class="name"><a href="#Name_object-feature-map">object-feature-map</a></span> <span class="name"><a href="../../../Computations/Normal/Giving/index.html#Name_given">given</a></span>,
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<span class="name"><a href="../Trees/index.html#Name_single-branching-sequence">single-branching-sequence</a></span> <span class="name"><a href="#Name_object-tree">object-tree</a></span> <a href="#Variable707_O"><i class="var">O</i></a>)</code></pre></div>
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For multiple inheritance, different resolution orders can be specified
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by using difference linearisations of the object tree.
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____
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From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
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[Objects.cbs]: Objects.cbs
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"CBS SOURCE FILE"
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[Funcons-beta]: /CBS-beta/docs/Funcons-beta
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"FUNCONS-BETA"
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[Unstable-Funcons-beta]: /CBS-beta/docs/Unstable-Funcons-beta
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"UNSTABLE-FUNCONS-BETA"
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[Languages-beta]: /CBS-beta/docs/Languages-beta
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"LANGUAGES-BETA"
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[Unstable-Languages-beta]: /CBS-beta/docs/Unstable-Languages-beta
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"UNSTABLE-LANGUAGES-BETA"
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[CBS-beta]: /CBS-beta "CBS-BETA"
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[PLanCompS Project]: https://plancomps.github.io
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"PROGRAMMING LANGUAGE COMPONENTS AND SPECIFICATIONS PROJECT HOME PAGE"
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[CBS-beta issues...]: https://github.com/plancomps/CBS-beta/issues
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"CBS-BETA ISSUE REPORTS ON GITHUB"
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[Suggest an improvement...]: mailto:plancomps@gmail.com?Subject=CBS-beta%20-%20comment&Body=Re%3A%20CBS-beta%20specification%20at%20Values/Composite/Objects/Objects.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
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"GENERATE AN EMAIL TEMPLATE"
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