Character type. </span>
  <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                    <a name="boost.log.expressions.format_terminal.format_type"></a><span class="identifier">format_type</span><span class="special">;</span>  <span class="comment">// Boost.Format formatter type. </span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</sp