
    <span class="special">{</span>
        <span class="keyword">typedef</span> <span class="identifier">Traits</span> <span class="identifier">traits</span> <span class="special">;</span>

        <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Traits</span><span class="special">::</span><span class="identifier">source_type</span>   <span class="identifier">source_type</span>   <span class="special">;</span>
        <span class="keyword">typedef</span> <