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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