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<title>Finding the Next Smaller Representable Value (float_prior)</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="math_toolkit.next_float.float_prior"></a><a class="link" href="float_prior.html" title="Finding the Next Smaller Representable Value (float_prior)">Finding the Next
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Smaller Representable Value (float_prior)</a>
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</h3></div></div></div>
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<h5>
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<a name="math_toolkit.next_float.float_prior.h0"></a>
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<span class="phrase"><a name="math_toolkit.next_float.float_prior.synopsis"></a></span><a class="link" href="float_prior.html#math_toolkit.next_float.float_prior.synopsis">Synopsis</a>
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</h5>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">math</span><span class="special">/</span><span class="identifier">special_functions</span><span class="special">/</span><span class="identifier">next</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">math</span><span class="special">{</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">FPT</span><span class="special">></span>
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<span class="identifier">FPT</span> <span class="identifier">float_prior</span><span class="special">(</span><span class="identifier">FPT</span> <span class="identifier">val</span><span class="special">);</span>
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<span class="special">}}</span> <span class="comment">// namespaces</span>
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</pre>
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<h5>
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<a name="math_toolkit.next_float.float_prior.h1"></a>
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<span class="phrase"><a name="math_toolkit.next_float.float_prior.description_float_prior"></a></span><a class="link" href="float_prior.html#math_toolkit.next_float.float_prior.description_float_prior">Description
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- float_prior</a>
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</h5>
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<p>
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Returns the next representable value which is less than <span class="emphasis"><em>x</em></span>.
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If <span class="emphasis"><em>x</em></span> is non-finite then returns the result of a <a class="link" href="../error_handling.html#math_toolkit.error_handling.domain_error">domain_error</a>. If
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there is no such value less than <span class="emphasis"><em>x</em></span> then returns an
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<a class="link" href="../error_handling.html#math_toolkit.error_handling.overflow_error">overflow_error</a>.
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</p>
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<p>
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Has the same effect as
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</p>
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<pre class="programlisting"><span class="identifier">nextafter</span><span class="special">(</span><span class="identifier">val</span><span class="special">,</span> <span class="special">-(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special"><</span><span class="identifier">FPT</span><span class="special">>::</span><span class="identifier">max</span><span class="special">)());</span> <span class="comment">// Note most negative value -max.</span>
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</pre>
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<div class="copyright-footer">Copyright © 2006-2021 Nikhar Agrawal, Anton Bikineev, Matthew Borland,
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Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert Holin, Bruno
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Lalande, John Maddock, Evan Miller, Jeremy Murphy, Matthew Pulver, Johan Råde,
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Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle
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Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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