 functions</a></span>
  <span class="keyword">const</span> <span class="keyword">char</span> <span class="special">*</span> <a class="link" href="context_error.html#idm45152240678528-bb"><span class="identifier">what</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">const</span> <span class="identifier">context</span> <span class="special">*</span> <a class="link" href="context_error.html#idm4515224