phic_A.hpp"><code style="white-space: normal">demo_polymorphic_A.hpp</code></a> and
<a target=demo_polymorphic_A_cpp href="../example/demo_polymorphic_A.cpp"><code style="white-space: normal">demo_polymorphic_A.cpp</code></a>
contain no templates and no reference to any specific archive implementation.  That is, they will
only have to be compiled once for all archive implementations.  This even applies to archives classes
created in the future.
  <li>The main program <a target=demo_polymorphic_cp href="../e