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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - 063list.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># A list links up multiple objects together to make them easier to manage.</span>
#
<span class="Comment"># Try to make all objects in a single list of the same type, it'll help avoid bugs.</span>
<span class="Comment"># If you want to store multiple types in a single list, use an exclusive-container.</span>

container list [
  value:location
  next:address:list
]

<span class="Comment"># result:address:list &lt;- push x:location, in:address:list</span>
recipe push [
  <span class="Underlined">local</span>-scope
  x:location<span class="Special"> &lt;- </span>next-ingredient
  <span class="Identifier">in</span>:address:list<span class="Special"> &lt;- </span>next-ingredient
  result:address:list<span class="Special"> &lt;- </span><span class="Identifier">new</span> list:<span class="Identifier">type</span>
  <span class="Identifier">val</span>:address:location<span class="Special"> &lt;- </span>get-address *result, value:offset
  *<span class="Identifier">val</span><span class="Special"> &lt;- </span><span class="Identifier">copy</span> x
  next:address:address:list<span class="Special"> &lt;- </span>get-address *result, next:offset
  *next<span class="Special"> &lt;- </span><span class="Identifier">copy</span> <span class="Identifier">in</span>
  reply result
]

<span class="Comment"># result:location &lt;- first in:address:list</span>
recipe first [
  <span class="Underlined">local</span>-scope
  <span class="Identifier">in</span>:address:list<span class="Special"> &lt;- </span>next-ingredient
  result:location<span class="Special"> &lt;- </span>get *<span class="Identifier">in</span>, value:offset
  reply result
]

<span class="Comment"># result:address:list &lt;- rest in:address:list</span>
recipe rest [
  <span class="Underlined">local</span>-scope
  <span class="Identifier">in</span>:address:list<span class="Special"> &lt;- </span>next-ingredient
  result:address:list<span class="Special"> &lt;- </span>get *<span class="Identifier">in</span>, next:offset
  reply result
]

scenario list-handling [
  run [
    1:address:list<span class="Special"> &lt;- </span><span class="Identifier">copy</span> 0
    1:address:list<span class="Special"> &lt;- </span>push 3, 1:address:list
    1:address:list<span class="Special"> &lt;- </span>push 4, 1:address:list
    1:address:list<span class="Special"> &lt;- </span>push 5, 1:address:list
    2:number<span class="Special"> &lt;- </span>first 1:address:list
    1:address:list<span class="Special"> &lt;- </span>rest 1:address:list
    3:number<span class="Special"> &lt;- </span>first 1:address:list
    1:address:list<span class="Special"> &lt;- </span>rest 1:address:list
    4:number<span class="Special"> &lt;- </span>first 1:address:list
    1:address:list<span class="Special"> &lt;- </span>rest 1:address:list
  ]
  memory-should-contain [
    1<span class="Special"> &lt;- </span>0  <span class="Comment"># empty to empty, dust to dust..</span>
    2<span class="Special"> &lt;- </span>5
    3<span class="Special"> &lt;- </span>4
    4<span class="Special"> &lt;- </span>3
  ]
]
</pre>
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