</span><span class="identifier">pair</span></code>
          as this is the value type of the <code class="computeroutput"><span class="identifier">const_step_time_iterator</span></code>'s.
        </p>
<p>
          Next, we discuss the adaptive iterators which are completely analogous
          to the const step iterators, but are based on adaptive stepper routines
          and thus adjust the step size during the iteration. Examples are
        </p>
<p>
</p>
<pre class="programlisting"><span class="keyw