_top">C++03</a>
      compiler (and it does not use <a href="http://en.wikipedia.org/wiki/Variadic_macro" target="_top">variadic
      macros</a>). <sup>[<a name="boost_utility_identitytype.solution.f0" href="#ftn.boost_utility_identitytype.solution.f0" class="footnote">1</a>]</sup> The authors originally developed and tested this library using
      GNU Compiler Collection (GCC) C++ 4.5.3 (with and without C++11 features enabled
      <code class="computeroutput"><span class="special">-</span><span class="