-bb"><span class="identifier">get_period</span></a><span class="special">(</span><span class="identifier">stream_itr_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">stream_itr_type</span> <span class="special">&amp;</span><span class="special">,</span> 
                           <span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span> <span class="special">&amp;</span><span class="special">,</span> <span