standard_policies.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2013 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
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/**
* @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