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| <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"> | ||
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| <meta charset="utf-8" /> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.19: https://docutils.sourceforge.io/" /> | ||
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| <title>Dynamically-Scoped Variable Words</title> | ||
| <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> | ||
| <link rel="stylesheet" type="text/css" href="../_static/epub.css" /> | ||
| </head><body> | ||
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| <div class="document"> | ||
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| <div class="body" role="main"> | ||
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| <section id="dynamically-scoped-variable-words"> | ||
| <h1>Dynamically-Scoped Variable Words</h1> | ||
| <p>Dynamically-scoped variables enable the definition of variables with a scope within a called execution token or within all execution inside a given thread except for within scopes in which they are redefined. Note that values of dynamically-scoped variables are specific to individual tasks, and do not exist for the main task on bootup or within new tasks on spawning.</p> | ||
| <section id="dynamic"> | ||
| <h2><code class="docutils literal notranslate"><span class="pre">dynamic</span></code></h2> | ||
| <p>The <code class="docutils literal notranslate"><span class="pre">dynamic</span></code> module contains the following words:</p> | ||
| <section id="dyn"> | ||
| <h3><code class="docutils literal notranslate"><span class="pre">dyn</span></code></h3> | ||
| <p>( “name” – )</p> | ||
| <p>This defines a dynamically-scoped single-cell variable with the specified <em>name</em>. Note that this does not give it any value. If this is executed during compilation to flash the defined variable will persist across reboots.</p> | ||
| </section> | ||
| <section id="id1"> | ||
| <h3><code class="docutils literal notranslate"><span class="pre">2dyn</span></code></h3> | ||
| <p>( “name” – )</p> | ||
| <p>This defines a dynamically-scoped double-cell variable with the specified <em>name</em>. Note that this does not give it any value. If this is executed during compilation to flash the defined variable will persist across reboots.</p> | ||
| </section> | ||
| <section id="id2"> | ||
| <h3><code class="docutils literal notranslate"><span class="pre">dyn!</span></code></h3> | ||
| <p>( xt x|xd variable – )</p> | ||
| <p>This sets a dynamically-scoped variable <em>variable</em> to <em>x</em> or <em>xd</em> depending on whether it is single-cell or double-cell within the scope defined by the execution token <em>xt</em> within the current task. This temporarily uses space in the current task’s RAM dictionary to store the defined value of <em>variable</em>.</p> | ||
| </section> | ||
| <section id="dyn-no-scope"> | ||
| <h3><code class="docutils literal notranslate"><span class="pre">dyn-no-scope!</span></code></h3> | ||
| <p>( x|xd variable – )</p> | ||
| <p>This sets a dynamically-scoped variable <em>variable</em> to <em>xt</em> or <em>xd</em> depending on whether it is single-cell or double-cell within the scope defined by all execution after this point within the current task until overridden by another execution of <code class="docutils literal notranslate"><span class="pre">dyn!</span></code> or <code class="docutils literal notranslate"><span class="pre">dyn-no-scope!</span></code>. Note that this permanently uses space in the current task’s RAM dictionary to store the defined value of <em>variable</em>; do not use this within implicit compilation.</p> | ||
| </section> | ||
| <section id="id3"> | ||
| <h3><code class="docutils literal notranslate"><span class="pre">dyn@</span></code></h3> | ||
| <p>( variable – x|xd )</p> | ||
| <p>This gets the current value of a dynamically-scoped variable <em>variable</em> within the current task as <em>x</em> or <em>xd</em> dependingon whether it is single-cell or double-cell.</p> | ||
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| # Dynamically-Scoped Variable Words | ||
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| Dynamically-scoped variables enable the definition of variables with a scope within a called execution token or within all execution inside a given thread except for within scopes in which they are redefined. Note that values of dynamically-scoped variables are specific to individual tasks, and do not exist for the main task on bootup or within new tasks on spawning. | ||
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| ### `dynamic` | ||
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| The `dynamic` module contains the following words: | ||
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| ##### `dyn` | ||
| ( "name" -- ) | ||
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| This defines a dynamically-scoped single-cell variable with the specified *name*. Note that this does not give it any value. If this is executed during compilation to flash the defined variable will persist across reboots. | ||
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| ##### `2dyn` | ||
| ( "name" -- ) | ||
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| This defines a dynamically-scoped double-cell variable with the specified *name*. Note that this does not give it any value. If this is executed during compilation to flash the defined variable will persist across reboots. | ||
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| ##### `dyn!` | ||
| ( xt x|xd variable -- ) | ||
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| This sets a dynamically-scoped variable *variable* to *x* or *xd* depending on whether it is single-cell or double-cell within the scope defined by the execution token *xt* within the current task. This temporarily uses space in the current task's RAM dictionary to store the defined value of *variable*. | ||
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| ##### `dyn-no-scope!` | ||
| ( x|xd variable -- ) | ||
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| This sets a dynamically-scoped variable *variable* to *xt* or *xd* depending on whether it is single-cell or double-cell within the scope defined by all execution after this point within the current task until overridden by another execution of `dyn!` or `dyn-no-scope!`. Note that this permanently uses space in the current task's RAM dictionary to store the defined value of *variable*; do not use this within implicit compilation. | ||
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| ##### `dyn@` | ||
| ( variable -- x|xd ) | ||
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| This gets the current value of a dynamically-scoped variable *variable* within the current task as *x* or *xd* dependingon whether it is single-cell or double-cell. |
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