><span class="special">::</span><span class="identifier">value_type</span></code></p>
<p>The
            numerical data type which is used within the stepper, something like
            <code class="computeroutput"><span class="keyword">float</span></code>, <code class="computeroutput"><span class="keyword">double</span></code>,
            <code class="computeroutput"><span class="identifier">complex</span><span class="special">&amp;</span><span class="identifier">lt</span><span class="special">;</span> <s