><span class="identifier">constants</span><span class="special">.</span><span class="identifier">hpp</span></code> or else into your own code, for example:
    </p>
<pre class="programlisting">  BOOST_DEFINE_MATH_CONSTANT(half_pi, 1.570796326794896619231321691639751442e+00, "1.57079632679489661923132169163975144209858469968755291048747229615390820314310449931401741267105853399107404326e+00");
</pre>
<p>
      This macro BOOST_DEFINE_MATH_CONSTANT inserts a C++ struct code snippet that
      declares the <co