/span>:
          slots in libsigc++ are created using a set of primitives
          defined by the library. These primitives allow binding of
          objects (as part of the library), explicit adaptation from
          the argument and return types of the signal to the argument
          and return types of the slot (libsigc++ is, by default, more
          strict about types than Boost.Signals2).</p></li>
<li class="listitem"><p><span class="bold"><strong>Combiner/Marshaller
          interface</strong>