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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software

// is hereby granted without fee, provided that the above copyright

// notice appears in all copies, and that both that copyright notice

// and this permission notice appear in supporting documentation. None

// of the above authors, nor IBM Haifa Research Laboratories, make any

// representation about the suitability of this software for any

// purpose. It is provided "as is" without express or implied

// warranty.

/**

 * @file synth_e_access_traits.hpp

 * Contains an implementation class for a patricia tree.

 */

#ifndef PB_DS_SYNTH_E_ACCESS_TRAITS_HPP

#define PB_DS_SYNTH_E_ACCESS_TRAITS_HPP

#include <ext/pb_ds/detail/type_utils.hpp>

namespace __gnu_pbds

{

  namespace detail

  {

#define PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC                               \

    template<typename Type_Traits, bool Set, class E_Access_Traits>

#define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC                               \

    synth_e_access_traits<                                              \

                                                Type_Traits,            \

                                                Set,                    \

                                                E_Access_Traits>

    template<typename Type_Traits, bool Set, class E_Access_Traits>

    struct synth_e_access_traits : public E_Access_Traits

    {

    private:

      typedef E_Access_Traits base_type;

      typedef Type_Traits type_traits;

      typedef typename type_traits::const_key_reference const_key_reference;

      typedef typename type_traits::const_reference const_reference;

    public:

      synth_e_access_traits();

      synth_e_access_traits(const E_Access_Traits& r_traits);

      inline bool

      equal_prefixes(typename base_type::const_iterator b_l, typename base_type::const_iterator e_l, typename base_type::const_iterator b_r, typename base_type::const_iterator e_r, bool compare_after = true) const;

      bool

      equal_keys(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const;

      bool

      cmp_prefixes(typename base_type::const_iterator b_l, typename base_type::const_iterator e_l, typename base_type::const_iterator b_r, typename base_type::const_iterator e_r, bool compare_after = false) const;

      bool

      cmp_keys(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const;

      inline static const_key_reference

      extract_key(const_reference r_val);

#ifdef _GLIBCXX_DEBUG

      bool

      operator()(const_key_reference r_lhs, const_key_reference r_rhs);

#endif

    private:

      inline static const_key_reference

      extract_key(const_reference r_val, true_type);

      inline static const_key_reference

      extract_key(const_reference r_val, false_type);

    private:

      static integral_constant<int,Set> s_set_ind;

    };

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    integral_constant<int,Set>

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::s_set_ind;

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    synth_e_access_traits()

    { }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    synth_e_access_traits(const E_Access_Traits& r_traits) :

      E_Access_Traits(r_traits)

    { }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    inline bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    equal_prefixes(typename base_type::const_iterator b_l, typename base_type::const_iterator e_l, typename base_type::const_iterator b_r, typename base_type::const_iterator e_r, bool compare_after /*= false */) const

    {

      while (b_l != e_l)

        {

          if (b_r == e_r)

            return (false);

          if (base_type::e_pos(*b_l) != base_type::e_pos(*b_r))

            return (false);

          ++b_l;

          ++b_r;

        }

      return (!compare_after || b_r == e_r);

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    equal_keys(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const

    {

      return (equal_prefixes(base_type::begin(r_lhs_key),

                             base_type::end(r_lhs_key),

                             base_type::begin(r_rhs_key),

                             base_type::end(r_rhs_key),

                             true));

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    cmp_prefixes(typename base_type::const_iterator b_l, typename base_type::const_iterator e_l, typename base_type::const_iterator b_r, typename base_type::const_iterator e_r, bool compare_after /* = false*/) const

    {

      while (b_l != e_l)

        {

          if (b_r == e_r)

            return (false);

          const typename base_type::size_type l_pos =

            base_type::e_pos(*b_l);

          const typename base_type::size_type r_pos =

            base_type::e_pos(*b_r);

          if (l_pos != r_pos)

            return (l_pos < r_pos);

          ++b_l;

          ++b_r;

        }

      if (!compare_after)

        return (false);

      return (b_r != e_r);

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    cmp_keys(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const

    {

      return (cmp_prefixes(base_type::begin(r_lhs_key),

                           base_type::end(r_lhs_key),

                           base_type::begin(r_rhs_key),

                           base_type::end(r_rhs_key),

                           true));

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::const_key_reference

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    extract_key(const_reference r_val)

    {

      return (extract_key(r_val, s_set_ind));

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::const_key_reference

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    extract_key(const_reference r_val, true_type)

    {

      return (r_val);

    }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::const_key_reference

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    extract_key(const_reference r_val, false_type)

    {

      return (r_val.first);

    }

#ifdef _GLIBCXX_DEBUG

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    operator()(const_key_reference r_lhs, const_key_reference r_rhs)

    {

      return (cmp_keys(r_lhs, r_rhs));

    }

#endif 

#undef PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

#undef PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC

  } // namespace detail

} // namespace __gnu_pbds

#endif