//  tuple.hpp - Boost Tuple Library --------------------------------------

 // Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)

 //

 // 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)

 // For more information, see http://www.boost.org

 // ----------------------------------------------------------------- 

 #ifndef BOOST_TUPLE_HPP

 #define BOOST_TUPLE_HPP

 #if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730

 // Work around a compiler bug.

 // boost::python::tuple has to be seen by the compiler before the

 // boost::tuple class template.

 namespace boost { namespace python { class tuple; }}

 #endif

 #include "boost/config.hpp"

 #include "boost/static_assert.hpp"

 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)

 // The MSVC version

 #include "boost/tuple/detail/tuple_basic_no_partial_spec.hpp"

 #else

 // other compilers

 #include "boost/ref.hpp"

 #include "boost/tuple/detail/tuple_basic.hpp"

 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 namespace boost {    

 using tuples::tuple;

 using tuples::make_tuple;

 using tuples::tie;

 #if !defined(BOOST_NO_USING_TEMPLATE)

 using tuples::get;

 #elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)

 //

 // The "using tuples::get" statement causes the

 // Borland compiler to ICE, use forwarding

 // functions instead:

 //

 template<int N, class HT, class TT>

 inline typename tuples::access_traits<

                   typename tuples::element<N, tuples::cons<HT, TT> >::type

                 >::non_const_type

 get(tuples::cons<HT, TT>& c) {

   return tuples::get<N,HT,TT>(c);

 } 

 // get function for const cons-lists, returns a const reference to

 // the element. If the element is a reference, returns the reference

 // as such (that is, can return a non-const reference)

 template<int N, class HT, class TT>

 inline typename tuples::access_traits<

                   typename tuples::element<N, tuples::cons<HT, TT> >::type

                 >::const_type

 get(const tuples::cons<HT, TT>& c) {

   return tuples::get<N,HT,TT>(c);

 }

 #else  // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

 //

 // MSVC, using declarations don't mix with templates well,

 // so use forwarding functions instead:

 //

 template<int N, typename Head, typename Tail>

 typename tuples::detail::element_ref<N, tuples::cons<Head, Tail> >::RET

 get(tuples::cons<Head, Tail>& t, tuples::detail::workaround_holder<N>* = 0)

 {

    return tuples::detail::get_class<N>::get(t);

 }

 template<int N, typename Head, typename Tail>

 typename tuples::detail::element_const_ref<N, tuples::cons<Head, Tail> >::RET

 get(const tuples::cons<Head, Tail>& t, tuples::detail::workaround_holder<N>* = 0)

 {

    return tuples::detail::get_class<N>::get(t);

 }

 #endif // BOOST_NO_USING_TEMPLATE

 } // end namespace boost

 #endif // BOOST_TUPLE_HPP