00494"></a><span class="lineno">  494</span>&#160;<span class="keywordtype">void</span> writeContextBase(std::ostream&amp; s, <span class="keyword">const</span> Context&amp; context);</div>
<div class="line"><a name="l00496"></a><span class="lineno">  496</span>&#160;<span class="keywordtype">void</span> readContextBase(std::istream&amp; s,</div>
<div class="line"><a name="l00497"></a><span class="lineno">  497</span>&#160;                     <span class="keywordtype">unsigned</span> <span class="keywordty