text: //-----------------------------------------------------------------------------
  // boost mpl/test/if.cpp source file
  // See http://www.boost.org for updates, documentation, and revision history.
  //-----------------------------------------------------------------------------
  //
  // Copyright (c) 2000-02
  // Aleksey Gurtovoy
  //
  // Permission to use, copy, modify, distribute and sell this software
  // and its documentation for any purpose is hereby granted without fee, 
  // provided that the above copyright notice appears in all copies and 
  // that both the copyright notice and this permission notice appear in 
  // supporting documentation. No representations are made about the 
  // suitability of this software for any purpose. It is provided "as is" 
  // without express or implied warranty.
  
  #include "boost/mpl/if.hpp"
  #include "boost/mpl/bool.hpp"
  #include "boost/mpl/assert_is_same.hpp"
  
  namespace mpl = boost::mpl;
  
  int main()
  {
      typedef mpl::if_<mpl::true_,char,long>::type t1;
      typedef mpl::if_c<true,char,long>::type t2;
      BOOST_MPL_ASSERT_IS_SAME(t1, char);
      BOOST_MPL_ASSERT_IS_SAME(t2, char);
  
      typedef mpl::if_<mpl::false_,char,long>::type t3;
      typedef mpl::if_c<false,char,long>::type t4;
      BOOST_MPL_ASSERT_IS_SAME(t3, long);
      BOOST_MPL_ASSERT_IS_SAME(t4, long);
  
      return 0;
  }
  