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<a name="boost.random.subtract_idm45507048596384"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template subtract_with_carry_01_engine</span></h2>
<p>boost::random::subtract_with_carry_01_engine</p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_random/reference.html#header.boost.random.subtract_with_carry_hpp" title="Header <boost/random/subtract_with_carry.hpp>">boost/random/subtract_with_carry.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> RealType<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> w<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> s<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> r<span class="special">></span>
<span class="keyword">class</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">RealType</span> <a name="boost.random.subtract_idm45507048596384.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>
<span class="comment">// <a class="link" href="subtract_idm45507048596384.html#boost.random.subtract_idm45507048596384construct-copy-destruct">construct/copy/destruct</a></span>
<a class="link" href="subtract_idm45507048596384.html#idm45506977588656-bb"><span class="identifier">subtract_with_carry_01_engine</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="subtract_idm45507048596384.html#idm45506977587328-bb"><span class="identifier">subtract_with_carry_01_engine</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="subtract_idm45507048596384.html#idm45506977584976-bb"><span class="identifier">subtract_with_carry_01_engine</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a class="link" href="subtract_idm45507048596384.html#idm45506977581712-bb"><span class="identifier">subtract_with_carry_01_engine</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="subtract_idm45507048596384.html#idm45507048583424-bb">public member functions</a></span>
<span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091291872-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091290640-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091288272-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091284992-bb"><span class="identifier">seed</span></a><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091280880-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091279584-bb"><span class="identifier">discard</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a class="link" href="subtract_idm45507048596384.html#idm45507091277216-bb"><span class="identifier">generate</span></a><span class="special">(</span><span class="identifier">Iter</span><span class="special">,</span> <span class="identifier">Iter</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="subtract_idm45507048596384.html#idm45506977577456-bb">public static functions</a></span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="subtract_idm45507048596384.html#idm45506977576896-bb"><span class="identifier">min</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">static</span> <span class="identifier">result_type</span> <a class="link" href="subtract_idm45507048596384.html#idm45507098669856-bb"><span class="identifier">max</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="subtract_idm45507048596384.html#idm45507098668112-bb">friend functions</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a class="link" href="subtract_idm45507048596384.html#idm45507098667552-bb"><span class="keyword">operator</span><span class="special"><<</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a class="link" href="subtract_idm45507048596384.html#idm45507098661920-bb"><span class="keyword">operator</span><span class="special">>></span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="subtract_idm45507048596384.html#idm45506977545152-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">friend</span> <span class="keyword">bool</span> <a class="link" href="subtract_idm45507048596384.html#idm45506977541744-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// public data members</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">bool</span> <span class="identifier">has_fixed_range</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">word_size</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">long_lag</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">short_lag</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span> <span class="identifier">default_seed</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555145889728"></a><h2>Description</h2>
<p>Instantiations of <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> model a <a class="link" href="../../boost_random/reference.html#boost_random.reference.concepts.pseudo_random_number_generator" title="Pseudo-Random Number Generator">pseudo-random number generator</a> . The algorithm is described in</p>
<p> </p>
<div class="blockquote"><blockquote class="blockquote"><p> "A New Class of Random Number Generators", George Marsaglia and Arif Zaman, Annals of Applied Probability, Volume 1, Number 3 (1991), 462-480. </p></blockquote></div>
<p> </p>
<div class="refsect2">
<a name="idm45555145886176"></a><h3>
<a name="boost.random.subtract_idm45507048596384construct-copy-destruct"></a><code class="computeroutput">subtract_with_carry_01_engine</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm45506977588656-bb"></a><span class="identifier">subtract_with_carry_01_engine</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> using the default seed. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45506977587328-bb"></a><span class="identifier">subtract_with_carry_01_engine</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> and seeds it with value. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span>
<span class="keyword">explicit</span> <a name="idm45506977584976-bb"></a><span class="identifier">subtract_with_carry_01_engine</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> and seeds with values produced by seq.generate(). </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <a name="idm45506977581712-bb"></a><span class="identifier">subtract_with_carry_01_engine</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Creates a new <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> and seeds it with values from a range. Advances first to point one past the last consumed value. If the range does not contain enough elements to fill the entire state, throws <code class="computeroutput">std::invalid_argument</code>. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555145849712"></a><h3>
<a name="idm45507048583424-bb"></a><code class="computeroutput">subtract_with_carry_01_engine</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45507091291872-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Seeds the generator with the default seed. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45507091290640-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint32_t</span> value<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds the generator with <code class="computeroutput">value</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> SeedSeq<span class="special">></span> <span class="keyword">void</span> <a name="idm45507091288272-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">SeedSeq</span> <span class="special">&</span> seq<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds the generator with values produced by <code class="computeroutput">seq.generate()</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a name="idm45507091284992-bb"></a><span class="identifier">seed</span><span class="special">(</span><span class="identifier">It</span> <span class="special">&</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Seeds the generator with values from a range. Updates first to point one past the last consumed element. If there are not enough elements in the range to fill the entire state, throws <code class="computeroutput">std::invalid_argument</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idm45507091280880-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the next value of the generator. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm45507091279584-bb"></a><span class="identifier">discard</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span> z<span class="special">)</span><span class="special">;</span></pre>
<p>Advances the state of the generator by <code class="computeroutput">z</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Iter<span class="special">></span> <span class="keyword">void</span> <a name="idm45507091277216-bb"></a><span class="identifier">generate</span><span class="special">(</span><span class="identifier">Iter</span> first<span class="special">,</span> <span class="identifier">Iter</span> last<span class="special">)</span><span class="special">;</span></pre>
<p>Fills a range with random values. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555145793888"></a><h3>
<a name="idm45506977577456-bb"></a><code class="computeroutput">subtract_with_carry_01_engine</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idm45506977576896-bb"></a><span class="identifier">min</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the smallest value that the generator can produce. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">result_type</span> <a name="idm45507098669856-bb"></a><span class="identifier">max</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Returns the largest value that the generator can produce. </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idm45555145781168"></a><h3>
<a name="idm45507098668112-bb"></a><code class="computeroutput">subtract_with_carry_01_engine</code> friend functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a name="idm45507098667552-bb"></a><span class="keyword">operator</span><span class="special"><<</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> os<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>Writes a <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> to a <code class="computeroutput">std::ostream</code>. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> CharT<span class="special">,</span> <span class="keyword">typename</span> Traits<span class="special">></span>
<span class="keyword">friend</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span>
<a name="idm45507098661920-bb"></a><span class="keyword">operator</span><span class="special">>></span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_istream</span><span class="special"><</span> <span class="identifier">CharT</span><span class="special">,</span> <span class="identifier">Traits</span> <span class="special">></span> <span class="special">&</span> is<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre>
<p>Reads a <code class="computeroutput"><a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a></code> from a <code class="computeroutput">std::istream</code>. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm45506977545152-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> x<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> y<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true if the two generators will produce identical sequences. </p>
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<pre class="literallayout"><span class="keyword">friend</span> <span class="keyword">bool</span> <a name="idm45506977541744-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> lhs<span class="special">,</span>
<span class="keyword">const</span> <a class="link" href="subtract_idm45507048596384.html" title="Class template subtract_with_carry_01_engine">subtract_with_carry_01_engine</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>
<p>Returns true if the two generators will produce different sequences. </p>
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