 next
            value. The corner cases occur at power of 2 boundaries.
          </li>
<li class="listitem">
            When the argument becomes very small, it may be that there is no floating-point
            value that represents one ULP. Whether this is the case or not depends
            not only on whether the hardware may <span class="emphasis"><em>sometimes</em></span> support
            denormals (as signalled by <code class="computeroutput"><span class="identifier">std</span><span class="spe