;</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">counter</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="identifier">it</span><span class="special">++)</span>
    <span class="special">{</span>
        <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">itv</span>  <spa