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|
// -*- 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_policy.hpp
* Contains hash-related policies.
*/
#ifndef HASH_POLICY_HPP
#define HASH_POLICY_HPP
#include <algorithm>
#include <vector>
#include <cmath>
#include <ext/pb_assoc/exception.hpp>
#include <ext/pb_assoc/detail/hash_fn/mask_based_range_hashing.hpp>
#include <ext/pb_assoc/detail/hash_fn/mod_based_range_hashing.hpp>
#include <ext/pb_assoc/detail/resize_policy/size_base.hpp>
namespace pb_assoc
{
struct null_hash_fn
{ };
struct null_probe_fn
{ };
#define PB_ASSOC_CLASS_T_DEC \
template<typename Const_Key_Ref, typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
linear_probe_fn< \
Const_Key_Ref, \
Size_Type>
template<typename Const_Key_Ref, typename Size_Type = size_t>
class linear_probe_fn
{
public:
typedef Size_Type size_type;
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
inline size_type
operator()(Const_Key_Ref r_key, size_type i) const;
};
#include <ext/pb_assoc/detail/hash_fn/linear_probe_fn_imp.hpp>
#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC
#define PB_ASSOC_CLASS_T_DEC \
template<class Const_Key_Ref, typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
quadratic_probe_fn<Const_Key_Ref, Size_Type>
template<typename Const_Key_Ref, typename Size_Type = size_t>
class quadratic_probe_fn
{
public:
typedef Size_Type size_type;
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
inline size_type
operator()(Const_Key_Ref r_key, size_type i) const;
};
#include <ext/pb_assoc/detail/hash_fn/quadratic_probe_fn_imp.hpp>
#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC
#define PB_ASSOC_CLASS_T_DEC \
template<typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
direct_mask_range_hashing<Size_Type>
template<typename Size_Type = size_t>
class direct_mask_range_hashing
: public pb_assoc::detail::mask_based_range_hashing<Size_Type>
{
public:
typedef Size_Type size_type;
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
void
notify_resized(size_type size);
inline size_type
operator()(size_type hash) const;
private:
typedef pb_assoc::detail::mask_based_range_hashing<Size_Type>
my_mask_based_base;
};
#define PB_ASSOC_MASK_BASED_C_DEC \
pb_assoc::detail::mask_based_range_hashing< \
Size_Type>
#include <ext/pb_assoc/detail/hash_fn/direct_mask_range_hashing_imp.hpp>
#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC
#undef PB_ASSOC_MASK_BASED_C_DEC
#define PB_ASSOC_CLASS_T_DEC \
template<typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
direct_mod_range_hashing<Size_Type>
#define PB_ASSOC_MOD_BASED_C_DEC \
pb_assoc::detail::mod_based_range_hashing<Size_Type>
template<typename Size_Type = size_t>
class direct_mod_range_hashing : public PB_ASSOC_MOD_BASED_C_DEC
{
public:
typedef Size_Type size_type;
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
/*
* description = "Notifies the policy object that the container's
* __size has changed to size.">
**/
void
notify_resized(size_type size);
inline size_type
operator()(size_type hash) const;
private:
typedef PB_ASSOC_MOD_BASED_C_DEC my_mod_based_base;
};
#include <ext/pb_assoc/detail/hash_fn/direct_mod_range_hashing_imp.hpp>
#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC
#undef PB_ASSOC_MOD_BASED_C_DEC
#ifdef PB_ASSOC_HT_LOAD_CHECK_RESIZE_TRIGGER_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_HT_LOAD_CHECK_RESIZE_TRIGGER_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_HT_LOAD_CHECK_RESIZE_TRIGGER_DEBUG
#define PB_ASSOC_CLASS_T_DEC \
template<bool External_Load_Access, typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
hash_load_check_resize_trigger<External_Load_Access, Size_Type>
#define PB_ASSOC_SIZE_BASE_C_DEC \
pb_assoc::detail::size_base<Size_Type, External_Load_Access>
template<bool External_Load_Access = false, typename Size_Type = size_t>
class hash_load_check_resize_trigger : private PB_ASSOC_SIZE_BASE_C_DEC
{
public:
typedef Size_Type size_type;
enum
{
external_load_access = External_Load_Access
};
hash_load_check_resize_trigger(float load_min = 0.125,
float load_max = 0.5);
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
virtual
~hash_load_check_resize_trigger();
inline std::pair<float, float>
get_loads() const;
void
set_loads(std::pair<float, float> load_pair);
protected:
inline void
notify_insert_search_start();
inline void
notify_insert_search_collision();
inline void
notify_insert_search_end();
inline void
notify_find_search_start();
inline void
notify_find_search_collision();
inline void
notify_find_search_end();
inline void
notify_erase_search_start();
inline void
notify_erase_search_collision();
inline void
notify_erase_search_end();
inline void
notify_inserted(size_type num_entries);
inline void
notify_erased(size_type num_entries);
void
notify_cleared();
void
notify_resized(size_type new_size);
void
notify_externally_resized(size_type new_size);
inline bool
is_resize_needed() const;
inline bool
is_grow_needed(size_type size, size_type num_entries) const;
inline bool
is_shrink_needed(size_type size, size_type num_entries) const;
typedef PB_ASSOC_SIZE_BASE_C_DEC my_size_base;
private:
inline std::pair<float, float>
get_loads_imp(pb_assoc::detail::int_to_type<true>) const;
void
set_loads_imp(std::pair<float, float>,
pb_assoc::detail::int_to_type<true>);
virtual void
do_resize(size_type new_size);
#ifdef PB_ASSOC_HT_LOAD_CHECK_RESIZE_TRIGGER_DEBUG
void
assert_valid() const;
#endif // #ifdef PB_ASSOC_HT_LOAD_CHECK_RESIZE_TRIGGER_DEBUG
float m_load_min, m_load_max;
size_type m_next_shrink_size;
size_type m_next_grow_size;
bool m_resize_needed;
static pb_assoc::detail::int_to_type<External_Load_Access>
s_external_load_access_ind;
};
#include <ext/pb_assoc/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp>
#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC
#undef PB_ASSOC_SIZE_BASE_C_DEC
#undef PB_ASSOC_DBG_ASSERT
#undef PB_ASSOC_DBG_VERIFY
#undef PB_ASSOC_DBG_ONLY
#ifdef PB_ASSOC_HT_MAX_COLLISION_CHECK_RESIZE_TRIGGER_POLICY_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_HT_MAX_COLLISION_CHECK_RESIZE_TRIGGER_POLICY_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_HT_MAX_COLLISION_CHECK_RESIZE_TRIGGER_POLICY_DEBUG
#define PB_ASSOC_CLASS_T_DEC \
template<bool External_Load_Access, typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
cc_hash_max_collision_check_resize_trigger< \
External_Load_Access, \
Size_Type>
template<bool External_Load_Access = false, typename Size_Type = size_t>
class cc_hash_max_collision_check_resize_trigger
{
public:
typedef Size_Type size_type;
enum
{
external_load_access = External_Load_Access
};
cc_hash_max_collision_check_resize_trigger(float load = 0.5);
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
inline float
get_load() const;
protected:
inline void
notify_insert_search_start();
inline void
notify_insert_search_collision();
inline void
notify_insert_search_end();
inline void
notify_find_search_start();
inline void
notify_find_search_collision();
inline void
notify_find_search_end();
inline void
notify_erase_search_start();
inline void
notify_erase_search_collision();
inline void
notify_erase_search_end();
inline void
notify_inserted(size_type num_entries);
inline void
notify_erased(size_type num_entries);
void
notify_cleared();
void
notify_resized(size_type new_size);
void
notify_externally_resized(size_type new_size);
inline bool
is_resize_needed() const;
inline bool
is_grow_needed(size_type size, size_type num_entries) const;
inline bool
is_shrink_needed(size_type size, size_type num_entries) const;
private:
template<typename Key>
class max_col_checker
{
public:
max_col_checker(size_type size, size_type* p_max_col)
: m_p_max_col(p_max_col), m_a_col(size, 0)
{ }
void
operator()(const std::pair<const Key, size_type>& r_key_pos_pair)
{ ++m_a_col[r_key_pos_pair.second]; }
private:
std::vector<size_type> m_a_col;
size_type* const m_p_max_col;
};
private:
inline float
get_load_imp(pb_assoc::detail::int_to_type<true>) const;
float m_load;
size_type m_size;
size_type m_num_col;
size_type m_max_col;
bool m_resize_needed;
static pb_assoc::detail::int_to_type<External_Load_Access>
s_external_load_access_ind;
};
#include <ext/pb_assoc/detail/resize_policy/cc_hash_max_collision_resize_trigger_imp.hpp>
#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
#define PB_ASSOC_CLASS_T_DEC \
template<typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
hash_exponential_size_policy< \
Size_Type>
template<typename Size_Type = size_t>
class hash_exponential_size_policy
{
public:
typedef Size_Type size_type;
hash_exponential_size_policy(size_type start_size = 8,
size_type grow_factor = 2);
void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
size_type
get_init_size(size_type suggested_size) const;
size_type
get_nearest_larger_size(size_type cur_size) const;
size_type
get_nearest_smaller_size(size_type cur_size) const;
#ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG
void
assert_is_one_of_my_sizes(size_type size) const;
#endif // #ifdef PB_ASSOC_HT_EXPONENTIAL_SIZE_POLICY_DEBUG
private:
size_type m_start_size;
size_type m_grow_factor;
};
#include <ext/pb_assoc/detail/resize_policy/hash_exponential_size_policy_imp.hpp>
#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
#define PB_ASSOC_CLASS_T_DEC
#define PB_ASSOC_CLASS_C_DEC \
hash_prime_size_policy
#ifdef PB_ASSOC_HT_PRIME_SIZE_POLICY_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_HT_PRIME_SIZE_POLICY_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_HT_PRIME_SIZE_POLICY_DEBUG
struct hash_prime_size_policy
{
typedef size_t size_type;
inline void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
protected:
inline size_type
get_init_size(size_type suggested_size) const;
inline size_type
get_nearest_larger_size(size_type cur_size) const;
inline size_type
get_nearest_smaller_size(size_type cur_size) const;
inline size_type
get_nearest_larger_size_imp(size_type size) const;
#ifdef PB_ASSOC_HT_PRIME_SIZE_POLICY_DEBUG
void
assert_is_one_of_my_sizes(size_type size) const;
#endif // #ifdef PB_ASSOC_HT_PRIME_SIZE_POLICY_DEBUG
};
#include <ext/pb_assoc/detail/resize_policy/hash_prime_size_policy_imp.hpp>
#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
#define PB_ASSOC_CLASS_T_DEC \
template< \
class Size_Policy, \
class Trigger_Policy, \
bool External_Size_Access, \
typename Size_Type>
#define PB_ASSOC_CLASS_C_DEC \
hash_standard_resize_policy< \
Size_Policy, \
Trigger_Policy, \
External_Size_Access, \
Size_Type>
template<class Size_Policy = pb_assoc::hash_exponential_size_policy<>,
class Trigger_Policy = pb_assoc::hash_load_check_resize_trigger<>,
bool External_Size_Access = false,
typename Size_Type = size_t>
class hash_standard_resize_policy : public Size_Policy, public Trigger_Policy
{
public:
typedef Size_Type size_type;
typedef Trigger_Policy trigger_policy;
typedef Size_Policy size_policy;
enum
{
external_size_access = External_Size_Access
};
hash_standard_resize_policy(size_type suggested_size = 8);
hash_standard_resize_policy(const Size_Policy&,
size_type suggested_size = 8);
hash_standard_resize_policy(const Size_Policy&, const Trigger_Policy&,
size_type suggested_size = 8);
virtual
~hash_standard_resize_policy();
inline void
swap(PB_ASSOC_CLASS_C_DEC& r_other);
Size_Policy&
get_size_policy();
const Size_Policy&
get_size_policy() const;
Trigger_Policy&
get_trigger_policy();
const Trigger_Policy&
get_trigger_policy() const;
inline size_type
get_actual_size() const;
void
resize(size_type suggested_new_size);
protected:
inline void
notify_insert_search_start();
inline void
notify_insert_search_collision();
inline void
notify_insert_search_end();
inline void
notify_find_search_start();
inline void
notify_find_search_collision();
inline void
notify_find_search_end();
inline void
notify_erase_search_start();
inline void
notify_erase_search_collision();
inline void
notify_erase_search_end();
inline void
notify_inserted(size_type num_e);
inline void
notify_erased(size_type num_e);
void
notify_cleared();
void
notify_resized(size_type new_size);
size_type
get_init_size() const;
inline bool
is_resize_needed() const;
size_type
get_new_size(size_type size, size_type num_used_e) const;
private:
typedef Trigger_Policy my_trigger_policy_base;
typedef Size_Policy my_size_policy_base;
typedef
pb_assoc::detail::int_to_type<false>
external_resize_false_indicator;
typedef
pb_assoc::detail::int_to_type<true>
external_resize_true_indicator;
inline size_type
get_actual_size(external_resize_true_indicator) const;
void
resize(size_type new_size, external_resize_true_indicator);
virtual void
do_resize(size_type new_size);
static pb_assoc::detail::int_to_type<External_Size_Access>
s_external_size_access_indicator;
size_type m_size;
};
#include <ext/pb_assoc/detail/resize_policy/hash_standard_resize_policy_imp.hpp>
#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 pb_assoc
#endif // #ifndef HASH_POLICY_HPP
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