+ BOOST_STATIC_ASSERT(!boost::is_integral<T>::value);
+ // factorial<unsigned int>(n) is not implemented
+ // because it would overflow integral type T for too small n
+ // to be useful. Use instead a floating-point type,
+ // and convert to an unsigned type if essential, for example:
+ // unsigned int nfac = static_cast<unsigned int>(factorial<double>(n));
+ // See factorial documentation for more detail.
+