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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 hash_eq_fn.hpp

 * Contains 2 eqivalence functions, one employing a hash value,

 *    and one ignoring it.

 */

#ifndef PB_DS_HASH_EQ_FN_HPP

#define PB_DS_HASH_EQ_FN_HPP

#include <utility>

#include <debug/debug.h>

namespace __gnu_pbds

{

  namespace detail

  {

    template<typename Key, class Eq_Fn, class Allocator, bool Store_Hash>

    struct hash_eq_fn;

#define PB_DS_CLASS_T_DEC \

    template<typename Key, class Eq_Fn, class Allocator>

#define PB_DS_CLASS_C_DEC \

    hash_eq_fn<Key, Eq_Fn, Allocator, false>

    /**

     * Specialization 1- The client requests that hash values not be stored.

     **/

    template<typename Key, class Eq_Fn, class Allocator>

    struct hash_eq_fn<Key, Eq_Fn, Allocator, false> : public Eq_Fn

    {

      typedef Eq_Fn eq_fn_base;

      typedef typename Allocator::template rebind<Key>::other key_allocator;

      typedef typename key_allocator::const_reference const_key_reference;

      hash_eq_fn();

      hash_eq_fn(const Eq_Fn& r_eq_fn);

      inline bool

      operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const;

      inline void

      swap(const PB_DS_CLASS_C_DEC& other);

    };

    PB_DS_CLASS_T_DEC

    PB_DS_CLASS_C_DEC::

    hash_eq_fn()

    { }

    PB_DS_CLASS_T_DEC

    inline void

    PB_DS_CLASS_C_DEC::

    swap(const PB_DS_CLASS_C_DEC& other)

    { std::swap((Eq_Fn& )(*this), (Eq_Fn& )other); }

    PB_DS_CLASS_T_DEC

    PB_DS_CLASS_C_DEC::

    hash_eq_fn(const Eq_Fn& r_eq_fn) :

      Eq_Fn(r_eq_fn)

    { }

    PB_DS_CLASS_T_DEC

    inline bool

    PB_DS_CLASS_C_DEC::

    operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const

    { return (eq_fn_base::operator()(r_lhs_key, r_rhs_key)); }

#undef PB_DS_CLASS_T_DEC

#undef PB_DS_CLASS_C_DEC

#define PB_DS_CLASS_T_DEC \

    template<typename Key, class Eq_Fn, class Allocator>

#define PB_DS_CLASS_C_DEC \

    hash_eq_fn<Key, Eq_Fn, Allocator, true>

    /**

     * Specialization 2- The client requests that hash values be stored.

     **/

    template<typename Key, class Eq_Fn, class Allocator>

    struct hash_eq_fn<Key, Eq_Fn, Allocator, true> :

      public Eq_Fn

    {

      typedef typename Allocator::size_type size_type;

      typedef Eq_Fn eq_fn_base;

      typedef typename Allocator::template rebind<Key>::other key_allocator;

      typedef typename key_allocator::const_reference const_key_reference;

      hash_eq_fn();

      hash_eq_fn(const Eq_Fn& r_eq_fn);

      inline bool

      operator()(const_key_reference r_lhs_key, size_type lhs_hash,

                 const_key_reference r_rhs_key, size_type rhs_hash) const;

      inline void

      swap(const PB_DS_CLASS_C_DEC& other);

    };

    PB_DS_CLASS_T_DEC

    PB_DS_CLASS_C_DEC::

    hash_eq_fn()

    { }

    PB_DS_CLASS_T_DEC

    PB_DS_CLASS_C_DEC::

    hash_eq_fn(const Eq_Fn& r_eq_fn) :

      Eq_Fn(r_eq_fn)

    { }

    PB_DS_CLASS_T_DEC

    inline bool

    PB_DS_CLASS_C_DEC::

    operator()(const_key_reference r_lhs_key, size_type lhs_hash,

               const_key_reference r_rhs_key, size_type rhs_hash) const

    {

      _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key)

                            || lhs_hash == rhs_hash);

      return (lhs_hash == rhs_hash &&

              eq_fn_base::operator()(r_lhs_key, r_rhs_key));

    }

    PB_DS_CLASS_T_DEC

    inline void

    PB_DS_CLASS_C_DEC::

    swap(const PB_DS_CLASS_C_DEC& other)

    { std::swap((Eq_Fn& )(*this), (Eq_Fn& )(other)); }

#undef PB_DS_CLASS_T_DEC

#undef PB_DS_CLASS_C_DEC

  } // namespace detail

} // namespace __gnu_pbds

#endif