Subversion Repositories altor32

// -*- C++ -*-

// Copyright (C) 2005, 2006, 2007, 2009, 2011 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 detail/standard_policies.hpp

 * Contains standard policies for containers.

 */

#ifndef PB_DS_STANDARD_POLICIES_HPP

#define PB_DS_STANDARD_POLICIES_HPP

#include <memory>

#include <ext/pb_ds/hash_policy.hpp>

#include <ext/pb_ds/list_update_policy.hpp>

#include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>

#include <ext/pb_ds/tree_policy.hpp>

#include <ext/pb_ds/trie_policy.hpp>

#include <ext/pb_ds/tag_and_trait.hpp>

#include <tr1/functional>

namespace __gnu_pbds

{

  namespace detail

  {

    /// Primary template, default_hash_fn.

    template<typename Key>

    struct default_hash_fn

    {

        /// Dispatched type.

      typedef std::tr1::hash<Key>                               type;

    };

    /// Primary template, default_eq_fn.

    template<typename Key>

    struct default_eq_fn

    {

        /// Dispatched type.

      typedef std::equal_to<Key>                                type;

    };

    /// Enumeration for default behavior of stored hash data.

    enum

      {

        default_store_hash = false

      };

    /// Primary template, default_comb_hash_fn.

    struct default_comb_hash_fn

    {

        /// Dispatched type.

      typedef direct_mask_range_hashing<>                       type;

    };

    /// Primary template, default_resize_policy.

    template<typename Comb_Hash_Fn>

    struct default_resize_policy

    {

    private:

      typedef typename Comb_Hash_Fn::size_type                  size_type;

      typedef direct_mask_range_hashing<size_type>              default_fn;

      typedef is_same<default_fn, Comb_Hash_Fn>                 same_type;

      typedef hash_exponential_size_policy<size_type>           iftrue;

      typedef hash_prime_size_policy                            iffalse;

      typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;

      typedef typename cond_type::__type                       size_policy_type;

      typedef hash_load_check_resize_trigger<false, size_type>  trigger;

    public:

        /// Dispatched type.

      typedef hash_standard_resize_policy<size_policy_type, trigger,

                                          false, size_type>     type;

    };

    /// Default update policy.

    struct default_update_policy

    {

        /// Dispatched type.

      typedef lu_move_to_front_policy<>                         type;

    };

    /// Primary template, default_probe_fn.

    template<typename Comb_Probe_Fn>

    struct default_probe_fn

    {

    private:

      typedef typename Comb_Probe_Fn::size_type                 size_type;

      typedef direct_mask_range_hashing<size_type>              default_fn;

      typedef is_same<default_fn, Comb_Probe_Fn>                same_type;

      typedef linear_probe_fn<size_type>                        iftrue;

      typedef quadratic_probe_fn<size_type>                     iffalse;

      typedef __conditional_type<same_type::value, iftrue, iffalse> cond_type;

    public:

        /// Dispatched type.

      typedef typename cond_type::__type                        type;

    };

    /// Primary template, default_trie_access_traits.

    template<typename Key>

      struct default_trie_access_traits;

#define __dtrie_alloc std::allocator<char>  

#define __dtrie_string std::basic_string<Char, Char_Traits, __dtrie_alloc> 

    /// Partial specialization, default_trie_access_traits.

    template<typename Char, typename Char_Traits>

      struct default_trie_access_traits<__dtrie_string>

      {

      private:

        typedef __dtrie_string                                  string_type;

      public:

        /// Dispatched type.

        typedef trie_string_access_traits<string_type>          type;

      };

#undef __dtrie_alloc

#undef __dtrie_string

  } // namespace detail

} // namespace __gnu_pbds

#endif // #ifndef PB_DS_STANDARD_POLICIES_HPP