<method name="total_microseconds" cv="const"><type>tick_type</type><purpose>Returns total number of microseconds truncating any sub microsecond values. </purpose></method>
<method name="fractional_seconds" cv="const"><type>fractional_seconds_type</type><purpose>Returns count of fractional seconds at given resolution. </purpose></method>
<method name="invert_sign" cv="const"><type>duration_type</type></method>
+<method name="abs" cv="const"><type>duration_type</type></method>
<method name="is_negative" cv="const"><type>bool</type></method>
+<method name="is_zero" cv="const"><type>bool</type></method>
+<method name="is_positive" cv="const"><type>bool</type></method>
<method name="operator<" cv="const"><type>bool</type><parameter name="rhs"><paramtype>const <classname>time_duration</classname> &</paramtype></parameter></method>
<method name="operator==" cv="const"><type>bool</type><parameter name="rhs"><paramtype>const <classname>time_duration</classname> &</paramtype></parameter></method>
<method name="operator-" cv="const"><type>duration_type</type><purpose>unary- Allows for <classname alt="boost::date_time::time_duration">time_duration</classname> td = -td1 </purpose></method>