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<a href="./Home">
MLton
20241230
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<h1>MLtonRandom</h1>
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<pre class="rouge highlight"><code data-lang="sml"><span class="kr">signature</span> <span class="nn">MLTON_RANDOM</span> <span class="p">=</span>
   <span class="kr">sig</span>
      <span class="kr">val</span> <span class="nv">alphaNumChar</span><span class="p">:</span> <span class="n">unit</span> <span class="p">-&gt;</span> <span class="n">char</span>
      <span class="kr">val</span> <span class="nv">alphaNumString</span><span class="p">:</span> <span class="n">int</span> <span class="p">-&gt;</span> <span class="n">string</span>
      <span class="kr">val</span> <span class="nv">rand</span><span class="p">:</span> <span class="n">unit</span> <span class="p">-&gt;</span> <span class="n">word</span>
      <span class="kr">val</span> <span class="nv">seed</span><span class="p">:</span> <span class="n">unit</span> <span class="p">-&gt;</span> <span class="n">word</span> <span class="n">option</span>
      <span class="kr">val</span> <span class="nv">srand</span><span class="p">:</span> <span class="n">word</span> <span class="p">-&gt;</span> <span class="n">unit</span>
      <span class="kr">val</span> <span class="nv">useed</span><span class="p">:</span> <span class="n">unit</span> <span class="p">-&gt;</span> <span class="n">word</span> <span class="n">option</span>
   <span class="kr">end</span></code></pre>
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<p><code>alphaNumChar ()</code></p>
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<p>returns a random alphanumeric character.</p>
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<p><code>alphaNumString n</code></p>
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<p>returns a string of length <code>n</code> of random alphanumeric characters.</p>
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<p><code>rand ()</code></p>
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<p>returns the next pseudo-random number.</p>
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<p><code>seed ()</code></p>
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<p>returns a random word from <code>/dev/random</code>.  Useful as an arg to
<code>srand</code>.  If <code>/dev/random</code> can not be read from, <code>seed ()</code> returns
<code>NONE</code>.  A call to <code>seed</code> may block until enough random bits are
available.</p>
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<p><code>srand w</code></p>
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<p>sets the seed used by <code>rand</code> to <code>w</code>.</p>
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<p><code>useed ()</code></p>
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<p>returns a random word from <code>/dev/urandom</code>.  Useful as an arg to
<code>srand</code>.  If <code>/dev/urandom</code> can not be read from, <code>useed ()</code> returns
<code>NONE</code>.  A call to <code>useed</code> will never block&#8201;&#8212;&#8201;it will instead return
lower quality random bits.</p>
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Last updated Thu Oct 21 15:53:06 2021 -0400 by Matthew Fluet.
<a href="https://github.com/MLton/mlton/commits/master/doc/guide/src/MLtonRandom.adoc">Log</a>
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