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/***************************************************************************
 *  include/stxxl/bits/common/tuple.h
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2003 Roman Dementiev <dementiev@mpi-sb.mpg.de>
 *
 *  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)
 **************************************************************************/

#ifndef STXXL_TUPLE_HEADER
#define STXXL_TUPLE_HEADER

#include <stxxl/bits/namespace.h>
#include <stxxl/bits/common/tmeta.h>


__STXXL_BEGIN_NAMESPACE

struct Plug { };


template <class T1,
          class T2,
          class T3,
          class T4,
          class T5,
          class T6
          >
struct tuple_base
{
    typedef T1 first_type;
    typedef T2 second_type;
    typedef T3 third_type;
    typedef T4 fourth_type;
    typedef T5 fifth_type;
    typedef T6 sixth_type;

    template <int I>
    struct item_type
    {
/*
        typedef typename SWITCH<I, CASE<1,first_type,
                                CASE<2,second_type,
                                CASE<3,third_type,
                                CASE<4,fourth_type,
                                CASE<5,fifth_type,
                                CASE<6,sixth_type,
                                CASE<DEFAULT,void
                            > > > > > > > >::result result;
*/
    };
};


//! \brief k-Tuple data type
//!
//! (defined for k < 7)
template <class T1,
          class T2 = Plug,
          class T3 = Plug,
          class T4 = Plug,
          class T5 = Plug,
          class T6 = Plug
          >
struct tuple
{
    typedef T1 first_type;
    typedef T2 second_type;
    typedef T3 third_type;
    typedef T4 fourth_type;
    typedef T5 fifth_type;
    typedef T6 sixth_type;

    template <int I>
    struct item_type
    {
        typedef typename SWITCH<I, CASE<1, first_type,
                                        CASE<2, second_type,
                                             CASE<3, third_type,
                                                  CASE<4, fourth_type,
                                                       CASE<5, fifth_type,
                                                            CASE<6, sixth_type,
                                                                 CASE<DEFAULT, void
                                                                      > > > > > > > >::result result;
    };

    //! \brief First tuple component
    first_type first;
    //! \brief Second tuple component
    second_type second;
    //! \brief Third tuple component
    third_type third;
    //! \brief Fourth tuple component
    fourth_type fourth;
    //! \brief Fifth tuple component
    fifth_type fifth;
    //! \brief Sixth tuple component
    sixth_type sixth;

    tuple() { }
    tuple(first_type fir,
          second_type sec,
          third_type thi,
          fourth_type fou,
          fifth_type fif,
          sixth_type six
          ) :
        first(fir),
        second(sec),
        third(thi),
        fourth(fou),
        fifth(fif),
        sixth(six)
    { }
};

//! \brief Partial specialization for 1- \c tuple
template <class T1>
struct tuple<T1, Plug, Plug, Plug, Plug>
{
    typedef T1 first_type;

    first_type first;

    template <int I>
    struct item_type
    {
        typedef typename IF<I == 1, first_type, void>::result result;
    };

    tuple() { }
    tuple(first_type fi) :
        first(fi)
    { }
};

//! \brief Partial specialization for 2- \c tuple (equivalent to std::pair)
template <class T1, class T2>
struct tuple<T1, T2, Plug, Plug, Plug, Plug>
{
    typedef T1 first_type;
    typedef T2 second_type;

    template <int I>
    struct item_type
    {
        typedef typename SWITCH<I, CASE<1, first_type,
                                        CASE<2, second_type,
                                             CASE<DEFAULT, void>
                                             > > >::result result;
    };

    first_type first;
    second_type second;

    tuple() { }
    tuple(first_type fi,
          second_type se
          ) :
        first(fi),
        second(se)
    { }
};


//! \brief Partial specialization for 3- \c tuple (triple)
template <class T1,
          class T2,
          class T3
          >
struct tuple<T1, T2, T3, Plug, Plug, Plug>
{
    typedef T1 first_type;
    typedef T2 second_type;
    typedef T3 third_type;

    template <int I>
    struct item_type
    {
        typedef typename SWITCH<I, CASE<1, first_type,
                                        CASE<2, second_type,
                                             CASE<3, second_type,
                                                  CASE<DEFAULT, void>
                                                  > > > >::result result;
    };


    first_type first;
    second_type second;
    third_type third;

    tuple() { }
    tuple(first_type fir,
          second_type sec,
          third_type thi
          ) :
        first(fir),
        second(sec),
        third(thi)
    { }
};

//! \brief Partial specialization for 4- \c tuple
template <class T1,
          class T2,
          class T3,
          class T4
          >
struct tuple<T1, T2, T3, T4, Plug, Plug>
{
    typedef T1 first_type;
    typedef T2 second_type;
    typedef T3 third_type;
    typedef T4 fourth_type;

    template <int I>
    struct item_type
    {
        typedef typename SWITCH<I, CASE<1, first_type,
                                        CASE<2, second_type,
                                             CASE<3, third_type,
                                                  CASE<4, fourth_type,
                                                       CASE<DEFAULT, void
                                                            > > > > > >::result result;
    };


    first_type first;
    second_type second;
    third_type third;
    fourth_type fourth;

    tuple() { }
    tuple(first_type fir,
          second_type sec,
          third_type thi,
          fourth_type fou
          ) :
        first(fir),
        second(sec),
        third(thi),
        fourth(fou)
    { }
};

//! \brief Partial specialization for 5- \c tuple
template <class T1,
          class T2,
          class T3,
          class T4,
          class T5
          >
struct tuple<T1, T2, T3, T4, T5, Plug>
{
    typedef T1 first_type;
    typedef T2 second_type;
    typedef T3 third_type;
    typedef T4 fourth_type;
    typedef T5 fifth_type;


    template <int I>
    struct item_type
    {
        typedef typename SWITCH<I, CASE<1, first_type,
                                        CASE<2, second_type,
                                             CASE<3, third_type,
                                                  CASE<4, fourth_type,
                                                       CASE<5, fifth_type,
                                                            CASE<DEFAULT, void
                                                                 > > > > > > >::result result;
    };

    first_type first;
    second_type second;
    third_type third;
    fourth_type fourth;
    fifth_type fifth;

    tuple() { }
    tuple(first_type fir,
          second_type sec,
          third_type thi,
          fourth_type fou,
          fifth_type fif
          ) :
        first(fir),
        second(sec),
        third(thi),
        fourth(fou),
        fifth(fif)
    { }
};

/*
   template <class tuple_type,int I>
   typename tuple_type::item_type<I>::result get(const tuple_type & t)
   {
   return NULL;
   }
*/

__STXXL_END_NAMESPACE

#endif // !STXXL_TUPLE_HEADER