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IBAF-cbs/Funcons-beta/Computations/Normal/Linking/index.md
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IBAF-cbs/Funcons-beta/Computations/Normal/Linking/index.md
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---
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layout: default
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title: "Linking"
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parent: Normal
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ancestor: Funcons-beta
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---
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[Funcons-beta] : [Linking.cbs]
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-----------------------------
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### Linking
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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_links">links</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_initialise-linking">initialise-linking</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_link">link</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_fresh-link">fresh-link</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_fresh-initialised-link">fresh-initialised-link</a></span> <i class="keyword">Alias</i> <span class="name"><a href="#Name_fresh-init-link">fresh-init-link</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_set-link">set-link</a></span>
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<i class="keyword">Funcon</i> <span class="name"><a href="#Name_follow-if-link">follow-if-link</a></span>
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]</code></pre></div>
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<div class="highlighter-rouge"><pre class="highlight"><code><i class="keyword">Meta-variables</i>
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<span id="PartVariable_T"><i class="var">T</i></span> <: <span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></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_links">links</span></span> ::= <span id="Name_link">link</span>(_:<span class="name"><a href="../Storing/index.html#Name_variables">variables</a></span>)</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_initialise-linking">initialise-linking</span></span>(<span id="Variable84_X"><i class="var">X</i></span>:=><span id="Variable89_T"><i class="var">T</i></span>) : =><span id="Variable104_T"><i class="var">T</i></span>
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~> <span class="name"><a href="../Storing/index.html#Name_initialise-storing">initialise-storing</a></span>(<a href="#Variable84_X"><i class="var">X</i></a>)</code></pre></div>
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<code><span class="name"><a href="#Name_initialise-linking">initialise-linking</a></span>(<i class="var">X</i>)</code> ensures that the entities used by the funcons for
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linking are properly initialised.
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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_fresh-link">fresh-link</span></span>(<span id="Variable152_T"><i class="var">T</i></span>) : =><span class="name"><a href="#Name_links">links</a></span>
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~> <span class="name"><a href="#Name_link">link</a></span>(<span class="name"><a href="../Storing/index.html#Name_allocate-variable">allocate-variable</a></span>(<a href="#Variable152_T"><i class="var">T</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_fresh-initialised-link">fresh-initialised-link</span></span>(<span id="Variable190_T"><i class="var">T</i></span>, <span id="Variable196_V"><i class="var">V</i></span>:<span id="Variable200_T"><i class="var">T</i></span>) : =><span class="name"><a href="#Name_links">links</a></span>
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~> <span class="name"><a href="#Name_link">link</a></span>(<span class="name"><a href="../Storing/index.html#Name_allocate-initialised-variable">allocate-initialised-variable</a></span>(<i class="var">T</i>, <a href="#Variable196_V"><i class="var">V</i></a>))
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<i class="keyword">Alias</i>
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<span class="name"><span id="Name_fresh-init-link">fresh-init-link</span></span> = <span class="name"><a href="#Name_fresh-initialised-link">fresh-initialised-link</a></span></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_set-link">set-link</span></span>(_:<span class="name"><a href="#Name_links">links</a></span>, _:<span id="Variable261_T"><i class="var">T</i></span>) : =><span class="name"><a href="../../../Values/Primitive/Null/index.html#Name_null-type">null-type</a></span></code></pre></div>
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The value of a link can be set only once.
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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_set-link">set-link</a></span>(<span class="name"><a href="#Name_link">link</a></span>(<span id="Variable289_Var"><i class="var">Var</i></span>:<span class="name"><a href="../Storing/index.html#Name_variables">variables</a></span>), <span id="Variable303_V"><i class="var">V</i></span>:<i class="var">T</i>) ~> <span class="name"><a href="../Storing/index.html#Name_initialise-variable">initialise-variable</a></span>(<a href="#Variable289_Var"><i class="var">Var</i></a>, <a href="#Variable303_V"><i class="var">V</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_follow-link">follow-link</span></span>(_:<span class="name"><a href="#Name_links">links</a></span>) : =><span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span>
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_follow-link">follow-link</a></span>(<span class="name"><a href="#Name_link">link</a></span>(<span id="Variable364_Var"><i class="var">Var</i></span>:<span class="name"><a href="../Storing/index.html#Name_variables">variables</a></span>)) ~> <span class="name"><a href="../Storing/index.html#Name_assigned">assigned</a></span>(<a href="#Variable364_Var"><i class="var">Var</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_follow-if-link">follow-if-link</span></span>(_:<span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span>) : =><span class="name"><a href="../../../Values/Value-Types/index.html#Name_values">values</a></span></code></pre></div>
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If <code><i class="var">V</i></code> is a link, <code><span class="name"><a href="#Name_follow-if-link">follow-if-link</a></span>(<i class="var">V</i>)</code> computes the set value, and
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otherwise it evaluates to <code><i class="var">V</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_follow-if-link">follow-if-link</a></span>(<span class="name"><a href="#Name_link">link</a></span>(<span id="Variable473_Var"><i class="var">Var</i></span>:<span class="name"><a href="../Storing/index.html#Name_variables">variables</a></span>)) ~> <span class="name"><a href="../Storing/index.html#Name_assigned">assigned</a></span>(<a href="#Variable473_Var"><i class="var">Var</i></a>)
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<i class="keyword">Rule</i>
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<span class="name"><a href="#Name_follow-if-link">follow-if-link</a></span>(<span id="Variable509_V"><i class="var">V</i></span>:~<span class="name"><a href="#Name_links">links</a></span>) ~> <a href="#Variable509_V"><i class="var">V</i></a></code></pre></div>
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____
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From the [PLanCompS Project] | [CBS-beta issues...] | [Suggest an improvement...]
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[Linking.cbs]: Linking.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%20Computations/Normal/Linking/Linking.cbs%0A%0AComment/Query/Issue/Suggestion%3A%0A%0A%0ASignature%3A%0A
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"GENERATE AN EMAIL TEMPLATE"
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