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<head><title>autoload(Symbol,String) -- arrange for a function to be loaded automatically</title>
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<div><a href="index.html" title="">Macaulay2Doc</a> > <a href="___The_sp__Macaulay2_splanguage.html" title="">The Macaulay2 language</a> > <a href="_system_spfacilities.html" title="">system facilities</a> > <a href="_autoload_lp__Symbol_cm__String_rp.html" title="arrange for a function to be loaded automatically">autoload(Symbol,String)</a></div>
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<div><h1>autoload(Symbol,String) -- arrange for a function to be loaded automatically</h1>
<div class="single"><h2>Synopsis</h2>
<ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>autoload(f,x)</tt></div>
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<li><span>Function: <a href="_autoload_lp__Symbol_cm__String_rp.html" title="arrange for a function to be loaded automatically">autoload</a></span></li>
<li><div class="single">Inputs:<ul><li><span><tt>f</tt>, <span>a <a href="___Symbol.html">symbol</a></span></span></li>
<li><span><tt>x</tt>, <span>a <a href="___String.html">string</a></span></span></li>
</ul>
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<li><div class="single">Consequences:<ul><li>arranges for a function named <tt>f</tt> to be automatically loaded from the file <tt>x</tt> the first time it is used. This is accomplished by creating a suitable function that will load the file and assigning the function to <tt>f</tt>.</li>
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<div class="single"><h2>Description</h2>
<div><table class="examples"><tr><td><pre>i1 : fn = temporaryFileName()
o1 = /tmp/M2-21361-1</pre>
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<tr><td><pre>i2 : fn << "f = x -> x+1\n" << close
o2 = /tmp/M2-21361-1
o2 : File</pre>
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<tr><td><pre>i3 : autoload(f,fn)</pre>
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<tr><td><pre>i4 : code f
o4 = /builddir/build/BUILD/Macaulay2-1.3.1-r10737/Macaulay2/m2/autoload.m2:5:20-11:23: --source code:
sym <- f := x -> (
load filename;
if f === value sym
then error("symbol '", toString sym, "' didn't acquire a new value in file '", filename, "'");
(value sym) x
);
)
| symbol class value location of symbol
| ------ ----- ----- ------------------
| sym : Symbol -- f /builddir/build/BUILD/Macaulay2-1.3.1-r10737/Macaulay2/m2/autoload.m2:3:29-3:31
| filename : String -- "/tmp/M2-21361-1" /builddir/build/BUILD/Macaulay2-1.3.1-r10737/Macaulay2/m2/autoload.m2:3:33-3:40
| f : FunctionClosure -- {*Function[/builddir/build/BUILD/Macaulay2-1.3.1-r1073. /builddir/build/BUILD/Macaulay2-1.3.1-r10737/Macaulay2/m2/autoload.m2:5:13-5:13</pre>
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<tr><td><pre>i5 : f 4
--warning: function f redefined
o5 = 5</pre>
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<tr><td><pre>i6 : removeFile fn</pre>
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