value_type</span><span class="special">,</span> <span class="identifier">SeverityT</span><span class="special">,</span> <span class="identifier">fallback_to_none</span><span class="special">,</span> <span class="identifier">fallback_to_none</span><span class="special">,</span> <span class="identifier">less</span><span class="special">,</span> <span class="identifier">greater_equal</span><span class="special">,</span> <span class="identifier">use_std_allocator</span><span class="special">,</span> <span class