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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 pat_trie_/synth_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, typename _ATraits>

#define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC \

    synth_access_traits<Type_Traits, Set, _ATraits>

    /// Synthetic element access traits.

    template<typename Type_Traits, bool Set, typename _ATraits>

    struct synth_access_traits : public _ATraits

    {

      typedef _ATraits                                  base_type;

      typedef typename base_type::const_iterator        const_iterator;

      typedef Type_Traits                               type_traits;

      typedef typename type_traits::const_reference     const_reference;

      typedef typename type_traits::key_const_reference key_const_reference;

      synth_access_traits();

      synth_access_traits(const base_type&);

      inline bool

      equal_prefixes(const_iterator, const_iterator, const_iterator,

                     const_iterator, bool compare_after = true) const;

      bool

      equal_keys(key_const_reference, key_const_reference) const;

      bool

      cmp_prefixes(const_iterator, const_iterator, const_iterator,

                   const_iterator, bool compare_after = false) const;

      bool

      cmp_keys(key_const_reference, key_const_reference) const;

      inline static key_const_reference

      extract_key(const_reference);

#ifdef _GLIBCXX_DEBUG

      bool

      operator()(key_const_reference, key_const_reference);

#endif

    private:

      inline static key_const_reference

      extract_key(const_reference, true_type);

      inline static key_const_reference

      extract_key(const_reference, false_type);

      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_access_traits()

    { }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    synth_access_traits(const _ATraits& r_traits)

    : _ATraits(r_traits)

    { }

    PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC

    inline bool

    PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::

    equal_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,

                   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(key_const_reference r_lhs_key,

               key_const_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(const_iterator b_l, const_iterator e_l, const_iterator b_r,

                 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(key_const_reference r_lhs_key,

             key_const_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::key_const_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::key_const_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::key_const_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()(key_const_reference r_lhs, key_const_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