/*

    Copyright David Abrahams 2003-2004
    Copyright Aleksey Gurtovoy 2003-2004

    Distributed under the Boost Software License, Version 1.0. 
    (See accompanying file LICENSE_1_0.txt or copy at 
    http://www.boost.org/LICENSE_1_0.txt)
            
    This file was automatically extracted from the source of 
    "C++ Template Metaprogramming", by David Abrahams and 
    Aleksey Gurtovoy.

    It FAILS to compile, as expected, with GCC 3.4.2 on Windows using
    the following command: 

        g++ -I..\..\boost_1_32_0 -c -o%TEMP%\metaprogram-chapter9-example6.o example6.cpp
        

*/
#include <boost/mpl/vector.hpp>
#include <boost/type_traits/is_class.hpp>

#include <boost/mpl/placeholders.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/static_assert.hpp>
namespace mpl = boost::mpl;
using namespace mpl::placeholders;

#include <iostream>
#include <typeinfo>
typedef mpl::vector<int&, long&, char*&> s;

template <class T>
void f(T x)
{
    if (boost::is_class<T>::value)
    {
        std::cout << x::value;  // handle integral wrappers
    }
    else
    {
        std::cout << x;         // handle non-wrappers
    }
}

int main() { f(42); }

