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


//  (C) Copyright Steve Cleary & 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 <boost/static_assert.hpp>

// all these tests should fail:

// Template class scope
template <class Int, class Char>
struct Bill
  private:  // can be in private, to avoid namespace pollution
    BOOST_STATIC_ASSERT(sizeof(Int) == 4);
    BOOST_STATIC_ASSERT(sizeof(Int) == sizeof(Char)); // should not compile when instantiated

  // Template member function scope: provides access to member variables
  Int x;
  Char c;
  template <class Int2, class Char2>
  void f(Int2 , Char2 )
    BOOST_STATIC_ASSERT(sizeof(Int) == sizeof(Int2));
    BOOST_STATIC_ASSERT(sizeof(Char) == sizeof(Char2));
    //BOOST_STATIC_ASSERT(sizeof(Int) == sizeof(Char)); // should not compile when instantiated

Bill<int, char> b;