Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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//  (C) Copyright John Maddock 2000.
//  Use, modification and distribution are subject to the 
//  Boost Software License, Version 1.0. (See accompanying file 
//  LICENSE_1_0.txt or copy at

//  See for most recent version including documentation.

#include <climits>
#include <boost/limits.hpp>
#include <boost/static_assert.hpp>

template <class UnsignedInt>
class myclass
   BOOST_STATIC_ASSERT(sizeof(UnsignedInt) * CHAR_BIT >= 16);
                        && std::numeric_limits<UnsignedInt>::is_integer
                        && !std::numeric_limits<UnsignedInt>::is_signed);
   /* details here */

myclass<unsigned>      m1; // this should be OK
//myclass<int>           m2; // this should fail
myclass<unsigned char> m3; // and so should this

int main()
   return 0;