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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_multiprecision.ref.cpp_dec_ref"></a><a class="link" href="cpp_dec_ref.html" title="cpp_dec_float">cpp_dec_float</a>
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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">multiprecision</span><span class="special">{</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="identifier">Digits10</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ExponentType</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int32_t</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="keyword">void</span><span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">cpp_dec_float</span><span class="special">;</span>

<span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">cpp_dec_float</span><span class="special">&lt;</span><span class="number">50</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">cpp_dec_float_50</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">cpp_dec_float</span><span class="special">&lt;</span><span class="number">100</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">cpp_dec_float_100</span><span class="special">;</span>

<span class="special">}}</span> <span class="comment">// namespaces</span>
</pre>
<p>
        Class template <code class="computeroutput"><span class="identifier">cpp_dec_float</span></code>
        fulfils all of the requirements for a <a class="link" href="backendconc.html" title="Backend Requirements">Backend</a>
        type. Its members and non-member functions are deliberately not documented:
        these are considered implementation details that are subject to change.
      </p>
<p>
        The class takes three template parameters:
      </p>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Digits10</span></dt>
<dd><p>
              The number of decimal digits precision the type should support. Note
              that this type does not normally perform any dynamic memory allocation,
              and as a result the <code class="computeroutput"><span class="identifier">Digits10</span></code>
              template argument should not be set too high or the class's size will
              grow unreasonably large.
            </p></dd>
<dt><span class="term">ExponentType</span></dt>
<dd><p>
              A signed integer type that represents the exponent of the number
            </p></dd>
<dt><span class="term">Allocator</span></dt>
<dd><p>
              The allocator used: defaults to type <code class="computeroutput"><span class="keyword">void</span></code>,
              meaning all storage is within the class, and no dynamic allocation
              is performed, but can be set to a standard library allocator if dynamic
              allocation makes more sense.
            </p></dd>
</dl>
</div>
<p>
        The type of <code class="computeroutput"><span class="identifier">number_category</span><span class="special">&lt;</span><span class="identifier">cpp_dec_float</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">...&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span></code> is <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="identifier">number_kind_floating_point</span><span class="special">&gt;</span></code>.
      </p>
<p>
        More information on this type can be found in the <a class="link" href="../tut/floats/cpp_dec_float.html" title="cpp_dec_float">tutorial</a>.
      </p>
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