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<a href="./Home">MLton 20201002</a>
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<h1>MLtonRandom</h1>
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<div class="content"><div class="highlight"><pre><span></span><span class="k">signature</span><span class="w"> </span><span class="n">MLTON_RANDOM</span><span class="w"> </span><span class="p">=</span><span class="w"></span>
<span class="w">   </span><span class="k">sig</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">alphaNumChar</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">char</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">alphaNumString</span><span class="p">:</span><span class="w"> </span><span class="n">int</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">string</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">rand</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">word</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">seed</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">word</span><span class="w"> </span><span class="n">option</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">srand</span><span class="p">:</span><span class="w"> </span><span class="n">word</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">unit</span><span class="w"></span>
<span class="w">      </span><span class="k">val</span><span class="w"> </span><span class="n">useed</span><span class="p">:</span><span class="w"> </span><span class="n">unit</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="n">word</span><span class="w"> </span><span class="n">option</span><span class="w"></span>
<span class="w">   </span><span class="k">end</span><span class="w"></span>
</pre></div></div></div>
<div class="ulist"><ul>
<li>
<p>
<span class="monospaced">alphaNumChar ()</span>
</p>
<div class="paragraph"><p>returns a random alphanumeric character.</p></div>
</li>
<li>
<p>
<span class="monospaced">alphaNumString n</span>
</p>
<div class="paragraph"><p>returns a string of length <span class="monospaced">n</span> of random alphanumeric characters.</p></div>
</li>
<li>
<p>
<span class="monospaced">rand ()</span>
</p>
<div class="paragraph"><p>returns the next pseudo-random number.</p></div>
</li>
<li>
<p>
<span class="monospaced">seed ()</span>
</p>
<div class="paragraph"><p>returns a random word from <span class="monospaced">/dev/random</span>.  Useful as an arg to
<span class="monospaced">srand</span>.  If <span class="monospaced">/dev/random</span> can not be read from, <span class="monospaced">seed ()</span> returns
<span class="monospaced">NONE</span>.  A call to <span class="monospaced">seed</span> may block until enough random bits are
available.</p></div>
</li>
<li>
<p>
<span class="monospaced">srand w</span>
</p>
<div class="paragraph"><p>sets the seed used by <span class="monospaced">rand</span> to <span class="monospaced">w</span>.</p></div>
</li>
<li>
<p>
<span class="monospaced">useed ()</span>
</p>
<div class="paragraph"><p>returns a random word from <span class="monospaced">/dev/urandom</span>.  Useful as an arg to
<span class="monospaced">srand</span>.  If <span class="monospaced">/dev/urandom</span> can not be read from, <span class="monospaced">useed ()</span> returns
<span class="monospaced">NONE</span>.  A call to <span class="monospaced">useed</span> will never block&#8201;&#8212;&#8201;it will instead return
lower quality random bits.</p></div>
</li>
</ul></div>
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