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<a name="boost_multiprecision.tut.complex.cpp_complex"></a><a class="link" href="cpp_complex.html" title="cpp_complex">cpp_complex</a>
</h4></div></div></div>
<p>
          <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">multiprecision</span><span class="special">/</span><span class="identifier">cpp_complex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
        </p>
<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">Digits</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_type</span> <span class="identifier">DigitBase</span> <span class="special">=</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_10</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">,</span> <span class="keyword">class</span> <span class="identifier">Exponent</span> <span class="special">=</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">Exponent</span> <span class="identifier">MinExponent</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">Exponent</span> <span class="identifier">MaxExponent</span> <span class="special">=</span> <span class="number">0</span><span class="special">&gt;</span>
   <span class="keyword">using</span> <span class="identifier">cpp_complex_backend</span> <span class="special">=</span> <span class="identifier">complex_adaptor</span><span class="special">&lt;</span><span class="identifier">cpp_bin_float</span><span class="special">&lt;</span><span class="identifier">Digits</span><span class="special">,</span> <span class="identifier">DigitBase</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">,</span> <span class="identifier">Exponent</span><span class="special">,</span> <span class="identifier">MinExponent</span><span class="special">,</span> <span class="identifier">MaxExponent</span><span class="special">&gt;</span> <span class="special">&gt;;</span>

   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">unsigned</span> <span class="identifier">Digits</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_type</span> <span class="identifier">DigitBase</span> <span class="special">=</span> <span class="identifier">digit_base_10</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">,</span> <span class="keyword">class</span> <span class="identifier">Exponent</span> <span class="special">=</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">Exponent</span> <span class="identifier">MinExponent</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">Exponent</span> <span class="identifier">MaxExponent</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> <span class="identifier">expression_template_option</span> <span class="identifier">ExpressionTemplates</span> <span class="special">=</span> <span class="identifier">et_off</span><span class="special">&gt;</span>
   <span class="keyword">using</span> <span class="identifier">cpp_complex</span> <span class="special">=</span> <span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">complex_adaptor</span><span class="special">&lt;</span><span class="identifier">cpp_bin_float</span><span class="special">&lt;</span><span class="identifier">Digits</span><span class="special">,</span> <span class="identifier">DigitBase</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">,</span> <span class="identifier">Exponent</span><span class="special">,</span> <span class="identifier">MinExponent</span><span class="special">,</span> <span class="identifier">MaxExponent</span><span class="special">&gt;</span> <span class="special">&gt;,</span> <span class="identifier">ExpressionTemplates</span><span class="special">&gt;;</span>

   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">50</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_50</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">100</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_100</span><span class="special">;</span>

   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">24</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_2</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int16_t</span><span class="special">,</span> <span class="special">-</span><span class="number">126</span><span class="special">,</span> <span class="number">127</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_single</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">53</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_2</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int16_t</span><span class="special">,</span> <span class="special">-</span><span class="number">1022</span><span class="special">,</span> <span class="number">1023</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_double</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">64</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_2</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int16_t</span><span class="special">,</span> <span class="special">-</span><span class="number">16382</span><span class="special">,</span> <span class="number">16383</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_extended</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">113</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_2</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">int16_t</span><span class="special">,</span> <span class="special">-</span><span class="number">16382</span><span class="special">,</span> <span class="number">16383</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_quad</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">237</span><span class="special">,</span> <span class="identifier">backends</span><span class="special">::</span><span class="identifier">digit_base_2</span><span class="special">,</span> <span class="keyword">void</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="special">-</span><span class="number">262142</span><span class="special">,</span> <span class="number">262143</span><span class="special">&gt;</span> <span class="identifier">cpp_complex_oct</span><span class="special">;</span>


<span class="special">}}</span> <span class="comment">// namespaces</span>
</pre>
<p>
          The <code class="computeroutput"><span class="identifier">cpp_complex_backend</span></code>
          back-end is used in conjunction with <code class="computeroutput"><span class="identifier">number</span></code>:
          It acts as an entirely C++ (header only and dependency free) complex number
          type that is a drop-in replacement for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span></code>,
          but with much greater precision.
        </p>
<p>
          The template alias <code class="computeroutput"><span class="identifier">cpp_complex</span></code>
          avoids the need to use class <code class="computeroutput"><span class="identifier">number</span></code>
          directly.
        </p>
<p>
          Type <code class="computeroutput"><span class="identifier">cpp_complex</span></code> can be
          used at fixed precision by specifying a non-zero <code class="computeroutput"><span class="identifier">Digits</span></code>
          template parameter. The typedefs <code class="computeroutput"><span class="identifier">cpp_complex_50</span></code>
          and <code class="computeroutput"><span class="identifier">cpp_complex_100</span></code> provide
          complex number types at 50 and 100 decimal digits precision respectively.
        </p>
<p>
          Optionally, you can specify whether the precision is specified in decimal
          digits or binary bits - for example to declare a <code class="computeroutput"><span class="identifier">cpp_complex</span></code>
          with exactly the same precision as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span></code> one would use <code class="computeroutput"><span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">53</span><span class="special">,</span>
          <span class="identifier">digit_base_2</span><span class="special">&gt;</span></code>.
          The typedefs <code class="computeroutput"><span class="identifier">cpp_complex_single</span></code>,
          <code class="computeroutput"><span class="identifier">cpp_complex_double</span></code>, <code class="computeroutput"><span class="identifier">cpp_complex_quad</span></code>, <code class="computeroutput"><span class="identifier">cpp_complex_oct</span></code>
          and <code class="computeroutput"><span class="identifier">cpp_complex_double_extended</span></code>
          provide software analogues of the IEEE single, double, quad and octuple
          float data types, plus the Intel-extended-double type respectively. Note
          that while these types are functionally equivalent to the native IEEE types,
          but they do not have the same size or bit-layout as true IEEE compatible
          types.
        </p>
<p>
          Normally <code class="computeroutput"><span class="identifier">cpp_complex</span></code> allocates
          no memory: all of the space required for its digits are allocated directly
          within the class. As a result care should be taken not to use the class
          with too high a digit count as stack space requirements can grow out of
          control. If that represents a problem then providing an allocator as a
          template parameter causes <code class="computeroutput"><span class="identifier">cpp_complex</span></code>
          to dynamically allocate the memory it needs: this significantly reduces
          the size of <code class="computeroutput"><span class="identifier">cpp_complex</span></code>
          and increases the viable upper limit on the number of digits at the expense
          of performance. However, please bear in mind that arithmetic operations
          rapidly become <span class="emphasis"><em>very</em></span> expensive as the digit count grows:
          the current implementation really isn't optimized or designed for large
          digit counts. Note that since the actual type of the objects allocated
          is completely opaque, the suggestion would be to use an allocator with
          <code class="computeroutput"><span class="keyword">char</span></code> <code class="computeroutput"><span class="identifier">value_type</span></code>,
          for example: <code class="computeroutput"><span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">1000</span><span class="special">,</span> <span class="identifier">digit_base_10</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span></code>.
        </p>
<p>
          The next template parameters determine the type and range of the exponent:
          parameter <code class="computeroutput"><span class="identifier">Exponent</span></code> can
          be any signed integer type, but note that <code class="computeroutput"><span class="identifier">MinExponent</span></code>
          and <code class="computeroutput"><span class="identifier">MaxExponent</span></code> can not
          go right up to the limits of the <code class="computeroutput"><span class="identifier">Exponent</span></code>
          type as there has to be a little extra headroom for internal calculations.
          You will get a compile time error if this is the case. In addition if MinExponent
          or MaxExponent are zero, then the library will choose suitable values that
          are as large as possible given the constraints of the type and need for
          extra headroom for internal calculations.
        </p>
<p>
          Finally, as with class <code class="computeroutput"><span class="identifier">number</span></code>,
          the final template parameter determines whether expression templates are
          turn on or not. Since by default this type allocates no memory, expression
          template support is off by default. However, you should probably turn it
          on if you specify an allocator.
        </p>
<p>
          There is full standard library support available for this type, comparable
          with what <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span></code> provides.
        </p>
<p>
          Things you should know when using this type:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              Default constructed <code class="computeroutput"><span class="identifier">cpp_complex</span></code>s
              have a value of zero.
            </li>
<li class="listitem">
              The radix of this type is 2, even when the precision is specified as
              decimal digits.
            </li>
<li class="listitem">
              The type supports both infinities and NaN's. An infinity is generated
              whenever the result would overflow, and a NaN is generated for any
              mathematically undefined operation.
            </li>
<li class="listitem">
              There is no <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span></code> specialisation for
              this type: this is the same behaviour as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span></code>.
              If you need <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span></code> support you need to
              look at <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="identifier">my_complex_number_type</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&gt;</span></code>.
            </li>
<li class="listitem">
              Any <code class="computeroutput"><span class="identifier">number</span></code> instantiated
              on this type, is convertible to any other <code class="computeroutput"><span class="identifier">number</span></code>
              instantiated on this type - for example you can convert from <code class="computeroutput"><span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">cpp_complex</span><span class="special">&lt;</span><span class="number">50</span><span class="special">&gt;</span> <span class="special">&gt;</span></code> to <code class="computeroutput"><span class="identifier">number</span><span class="special">&lt;</span><span class="identifier">cpp_bin_float</span><span class="special">&lt;</span><span class="identifier">SomeOtherValue</span><span class="special">&gt;</span> <span class="special">&gt;</span></code>.
              Narrowing conversions round to nearest and are <code class="computeroutput"><span class="keyword">explicit</span></code>.
            </li>
<li class="listitem">
              Conversion from a string results in a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code>
              being thrown if the string can not be interpreted as a valid complex
              number.
            </li>
</ul></div>
<h6>
<a name="boost_multiprecision.tut.complex.cpp_complex.h0"></a>
          <span class="phrase"><a name="boost_multiprecision.tut.complex.cpp_complex.example"></a></span><a class="link" href="cpp_complex.html#boost_multiprecision.tut.complex.cpp_complex.example">example:</a>
        </h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">complex</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">multiprecision</span><span class="special">/</span><span class="identifier">cpp_complex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Complex</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">complex_number_examples</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">Complex</span> <span class="identifier">z1</span><span class="special">{</span><span class="number">0</span><span class="special">,</span> <span class="number">1</span><span class="special">};</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setprecision</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Complex</span><span class="special">::</span><span class="identifier">value_type</span><span class="special">&gt;::</span><span class="identifier">digits10</span><span class="special">);</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">scientific</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">fixed</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Print a complex number: "</span> <span class="special">&lt;&lt;</span> <span class="identifier">z1</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Square it             : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">z1</span><span class="special">*</span><span class="identifier">z1</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Real part             : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">z1</span><span class="special">.</span><span class="identifier">real</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">" = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">real</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Imaginary part        : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">z1</span><span class="special">.</span><span class="identifier">imag</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="string">" = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">imag</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">abs</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Absolute value        : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">abs</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Argument              : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">arg</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Norm                  : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">norm</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Complex conjugate     : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">conj</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Projection onto Riemann sphere: "</span> <span class="special">&lt;&lt;</span>  <span class="identifier">proj</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">typename</span> <span class="identifier">Complex</span><span class="special">::</span><span class="identifier">value_type</span> <span class="identifier">r</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span>
    <span class="keyword">typename</span> <span class="identifier">Complex</span><span class="special">::</span><span class="identifier">value_type</span> <span class="identifier">theta</span> <span class="special">=</span> <span class="number">0.8</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">polar</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Polar coordinates (phase = 0)    : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">polar</span><span class="special">(</span><span class="identifier">r</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Polar coordinates (phase !=0)    : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">polar</span><span class="special">(</span><span class="identifier">r</span><span class="special">,</span> <span class="identifier">theta</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>

    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"\nElementary special functions:\n"</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">exp</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"exp(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">exp</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">log</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"log(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">log</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">log10</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"log10(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">log10</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">pow</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"pow(z1, z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">pow</span><span class="special">(</span><span class="identifier">z1</span><span class="special">,</span> <span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">sqrt</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Take its square root  : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">sqrt</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">sin</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"sin(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">sin</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cos</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"cos(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">cos</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">tan</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"tan(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">tan</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">asin</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"asin(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">asin</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">acos</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"acos(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">acos</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">atan</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"atan(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">atan</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">sinh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"sinh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">sinh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cosh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"cosh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">cosh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">tanh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"tanh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">tanh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">asinh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"asinh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">asinh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">acosh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"acosh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">acosh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
    <span class="keyword">using</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">atanh</span><span class="special">;</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"atanh(z1) = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">atanh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="special">}</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"First, some operations we usually perform with std::complex:\n"</span><span class="special">;</span>
    <span class="identifier">complex_number_examples</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">&gt;&gt;();</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"\nNow the same operations performed using quad precision complex numbers:\n"</span><span class="special">;</span>
    <span class="identifier">complex_number_examples</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">multiprecision</span><span class="special">::</span><span class="identifier">cpp_complex_quad</span><span class="special">&gt;();</span>

    <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
          Which produces the output (for the multiprecision type):
        </p>
<pre class="programlisting"><span class="identifier">Print</span> <span class="identifier">a</span> <span class="identifier">complex</span> <span class="identifier">number</span><span class="special">:</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.000000000000000000000000000000000</span><span class="special">)</span>
<span class="identifier">Square</span> <span class="identifier">it</span>             <span class="special">:</span> <span class="special">-</span><span class="number">1.000000000000000000000000000000000</span>
<span class="identifier">Real</span> <span class="identifier">part</span>             <span class="special">:</span> <span class="number">0.000000000000000000000000000000000</span> <span class="special">=</span> <span class="number">0.000000000000000000000000000000000</span>
<span class="identifier">Imaginary</span> <span class="identifier">part</span>        <span class="special">:</span> <span class="number">1.000000000000000000000000000000000</span> <span class="special">=</span> <span class="number">1.000000000000000000000000000000000</span>
<span class="identifier">Absolute</span> <span class="identifier">value</span>        <span class="special">:</span> <span class="number">1.000000000000000000000000000000000</span>
<span class="identifier">Argument</span>              <span class="special">:</span> <span class="number">1.570796326794896619231321691639751</span>
<span class="identifier">Norm</span>                  <span class="special">:</span> <span class="number">1.000000000000000000000000000000000</span>
<span class="identifier">Complex</span> <span class="identifier">conjugate</span>     <span class="special">:</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,-</span><span class="number">1.000000000000000000000000000000000</span><span class="special">)</span>
<span class="identifier">Projection</span> <span class="identifier">onto</span> <span class="identifier">Riemann</span> <span class="identifier">sphere</span><span class="special">:</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.000000000000000000000000000000000</span><span class="special">)</span>
<span class="identifier">Polar</span> <span class="identifier">coordinates</span> <span class="special">(</span><span class="identifier">phase</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span>    <span class="special">:</span> <span class="number">1.000000000000000000000000000000000</span>
<span class="identifier">Polar</span> <span class="identifier">coordinates</span> <span class="special">(</span><span class="identifier">phase</span> <span class="special">!=</span><span class="number">0</span><span class="special">)</span>    <span class="special">:</span> <span class="special">(</span><span class="number">0.696706709347165389063740022772448</span><span class="special">,</span><span class="number">0.717356090899522792567167815703377</span><span class="special">)</span>

<span class="identifier">Elementary</span> <span class="identifier">special</span> <span class="identifier">functions</span><span class="special">:</span>
<span class="identifier">exp</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.540302305868139717400936607442977</span><span class="special">,</span><span class="number">0.841470984807896506652502321630299</span><span class="special">)</span>
<span class="identifier">log</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.570796326794896619231321691639751</span><span class="special">)</span>
<span class="identifier">log10</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">0.682188176920920673742891812715678</span><span class="special">)</span>
<span class="identifier">pow</span><span class="special">(</span><span class="identifier">z1</span><span class="special">,</span> <span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="number">0.207879576350761908546955619834979</span>
<span class="identifier">Take</span> <span class="identifier">its</span> <span class="identifier">square</span> <span class="identifier">root</span>  <span class="special">:</span> <span class="special">(</span><span class="number">0.707106781186547524400844362104849</span><span class="special">,</span><span class="number">0.707106781186547524400844362104849</span><span class="special">)</span>
<span class="identifier">sin</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.175201193643801456882381850595601</span><span class="special">)</span>
<span class="identifier">cos</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="number">1.543080634815243778477905620757062</span>
<span class="identifier">tan</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">0.761594155955764888119458282604794</span><span class="special">)</span>
<span class="identifier">asin</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">0.881373587019543025232609324979793</span><span class="special">)</span>
<span class="identifier">acos</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">1.570796326794896619231321691639751</span><span class="special">,-</span><span class="number">0.881373587019543025232609324979793</span><span class="special">)</span>
<span class="identifier">atan</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="identifier">inf</span><span class="special">)</span>
<span class="identifier">sinh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">0.841470984807896506652502321630299</span><span class="special">)</span>
<span class="identifier">cosh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="number">0.540302305868139717400936607442977</span>
<span class="identifier">tanh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.557407724654902230506974807458360</span><span class="special">)</span>
<span class="identifier">asinh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">1.570796326794896619231321691639751</span><span class="special">)</span>
<span class="identifier">acosh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.881373587019543025232609324979792</span><span class="special">,</span><span class="number">1.570796326794896619231321691639751</span><span class="special">)</span>
<span class="identifier">atanh</span><span class="special">(</span><span class="identifier">z1</span><span class="special">)</span> <span class="special">=</span> <span class="special">(</span><span class="number">0.000000000000000000000000000000000</span><span class="special">,</span><span class="number">0.785398163397448309615660845819876</span><span class="special">)</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2002-2019 John Maddock
      and Christopher Kormanyos<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        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>)
      </p>
</div></td>
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