Subversion Repositories scarts

// -*- C++ -*-

// Copyright (C) 2005 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 2, 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.

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

// with this library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

// 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 HASH_EQ_FN_HPP

#define HASH_EQ_FN_HPP

#include <utility>

namespace pb_assoc

{

  namespace detail

  {

#ifdef PB_ASSOC_HASH_EQ_FN_DEBUG

#define PB_ASSOC_DBG_ASSERT(X) assert(X)

#define PB_ASSOC_DBG_VERIFY(X) assert(X)

#define PB_ASSOC_DBG_ONLY(X) X

#else // #ifdef PB_ASSOC_HASH_EQ_FN_DEBUG

#define PB_ASSOC_DBG_ASSERT(X)

#define PB_ASSOC_DBG_VERIFY(X) {if((X)==0);}

#define PB_ASSOC_DBG_ONLY(X) ;

#endif // #ifdef PB_ASSOC_HASH_EQ_FN_DEBUG

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

    struct hash_eq_fn;

#define PB_ASSOC_CLASS_T_DEC \

        template<typename Key, class Eq_Fn, class Allocator>

#define PB_ASSOC_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 my_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_ASSOC_CLASS_C_DEC& r_other);

    };

    PB_ASSOC_CLASS_T_DEC

    PB_ASSOC_CLASS_C_DEC::

    hash_eq_fn()

    { }

    PB_ASSOC_CLASS_T_DEC

    inline void

    PB_ASSOC_CLASS_C_DEC::

    swap(const PB_ASSOC_CLASS_C_DEC& r_other)

    {

      std::swap((Eq_Fn& )(*this), (Eq_Fn& )r_other);

    }

    PB_ASSOC_CLASS_T_DEC

    PB_ASSOC_CLASS_C_DEC::

    hash_eq_fn(const Eq_Fn& r_eq_fn) :

      Eq_Fn(r_eq_fn)

    { }

    PB_ASSOC_CLASS_T_DEC

    inline bool

    PB_ASSOC_CLASS_C_DEC::

    operator()(const_key_reference r_lhs_key, const_key_reference r_rhs_key) const

    {

      return (my_eq_fn_base::operator()(r_lhs_key, r_rhs_key));

    }

#undef PB_ASSOC_CLASS_T_DEC

#undef PB_ASSOC_CLASS_C_DEC

#define PB_ASSOC_CLASS_T_DEC \

        template<typename Key, class Eq_Fn, class Allocator>

#define PB_ASSOC_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 my_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_ASSOC_CLASS_C_DEC& r_other);

    };

    PB_ASSOC_CLASS_T_DEC

    PB_ASSOC_CLASS_C_DEC::

    hash_eq_fn()

    { }

    PB_ASSOC_CLASS_T_DEC

    PB_ASSOC_CLASS_C_DEC::

    hash_eq_fn(const Eq_Fn& r_eq_fn) :

      Eq_Fn(r_eq_fn)

    { }

    PB_ASSOC_CLASS_T_DEC

    inline bool

    PB_ASSOC_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

    {

      PB_ASSOC_DBG_ASSERT(!my_eq_fn_base::operator()(r_lhs_key, r_rhs_key) ||

                          lhs_hash == rhs_hash);

      return (lhs_hash == rhs_hash&&

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

    }

    PB_ASSOC_CLASS_T_DEC

    inline void

    PB_ASSOC_CLASS_C_DEC::

    swap(const PB_ASSOC_CLASS_C_DEC& r_other)

    {

      std::swap((Eq_Fn& )(*this), (Eq_Fn& )(r_other));

    }

#undef PB_ASSOC_CLASS_T_DEC

#undef PB_ASSOC_CLASS_C_DEC

#undef PB_ASSOC_DBG_ASSERT

#undef PB_ASSOC_DBG_VERIFY

#undef PB_ASSOC_DBG_ONLY

  } // namespace detail

} // namespace pb_assoc

#endif // #ifndef HASH_EQ_FN_HPP