_discrete</a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">time_duration</span><span class="special">&gt;</span><span class="special">;</span>
    <span class="keyword">template</span><span class="special">&lt;</span><span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="../../../boost/icl/size_typ_idm45366785535008.html