pan class="special">&gt;</span> <span class="special">&amp;</span> <a class="link" href="oct_non_mem.html#math_toolkit.oct_non_mem.stream_inserter">operator &lt;&lt;</a> <span class="special">(::</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span><span class="identifier">traits</span><span class="special">&gt;</span> <span class="special">&amp;