source" href="16_interface_specifications.html">                 16_interface_specifications.h               </a>                                           <a class="source" href="17_namespaces.html">                 17_namespaces.cpp               </a>                                           <a class="source" href="18_namespaces_example.html">                 18_namespaces_example.cpp               </a>                                           <a class="source" href="19_uml.html">                 19_uml