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<title>avram - a virtual machine code interpreter: 2.7.4.3 Standard Library</title>

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<a name="Standard-Library"></a>
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<tr><td valign="middle" align="left">[<a href="Semantics.html#Semantics" title="Previous section in reading order"> &lt; </a>]</td>
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<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="Virtual-Machine-Specification.html#Virtual-Machine-Specification" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="A-Simple-Lisp-Like-Language.html#A-Simple-Lisp-Like-Language" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="avram_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Function-Index.html#Function-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="avram_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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<hr size="1">
<a name="Standard-Library-1"></a>
<h4 class="subsubsection">2.7.4.3 Standard Library</h4>

<p><code>silly</code> programs may be linked with library modules, which consist
of <code>silly</code> source text to be concatenated with the user
<a name="index-library-modules"></a>
<a name="index-standard-prelude"></a>
program prior to the preprocessing phase. Most <code>silly</code> programs are
linked with the standard <code>silly</code> prelude, which contains the
following declarations among others.
<a name="index-nil-2"></a>
<a name="index-identity"></a>
<a name="index-left"></a>
<a name="index-right"></a>
<a name="index-meta"></a>
<a name="index-constant"></a>
<a name="index-couple"></a>
<a name="index-compose"></a>
<a name="index-conditional"></a>
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">
nil           = ()
identity      = (nil,(nil,nil))
left          = (nil,((nil,nil),nil))
right         = (nil,(nil,(nil,nil)))
meta          = (((nil,(nil,nil)),nil),nil)
constant_nil  = ((nil,nil),nil)
couple        = ((((left,nil),constant_nil),nil),right)
compose       = couple(identity,constant_nil)
constant      = couple(couple(constant_nil,identity),constant_nil)
conditional   =
   couple(couple(left,compose(left,right)),compose(right,right))

</pre></td></tr></table>

<p>There is a close correspondence between these declarations and the
properties described in <a href="A-Minimal-Set-of-Properties.html#A-Minimal-Set-of-Properties">A Minimal Set of Properties</a>. A fitting analogy would be that
the properties of the operator specify the virtual machine instruction
set in a language independent way, and the <code>silly</code> library defines
the instruction mnemonics for a virtual assembly language. The
<a name="index-mnemonics"></a>
relationship of some mnemonics to their corresponding instructions may
be less clear than that of others, so they are all discussed next.
</p>
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