arc-snps-linux-uclibc/include/c++/4.8.5/ext/pb_ds/hash_policy.hpp - toolchains/quantenna - Git at Google

 // -*- 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
 // 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 PB_DS_HASH_POLICY_HPP
 #define PB_DS_HASH_POLICY_HPP

 #include <bits/c++config.h>
 #include <algorithm>
 #include <vector>
 #include <cmath>
 #include <ext/pb_ds/exception.hpp>
 #include <ext/pb_ds/detail/type_utils.hpp>
 #include <ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp>
 #include <ext/pb_ds/detail/hash_fn/mod_based_range_hashing.hpp>
 #include <ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_size_base.hpp>

 namespace __gnu_pbds
 {
 #define PB_DS_CLASS_T_DEC template<typename Size_Type>
 #define PB_DS_CLASS_C_DEC linear_probe_fn<Size_Type>

   /// A probe sequence policy using fixed increments.
   template<typename Size_Type = std::size_t>
   class linear_probe_fn
   {
   public:
     typedef Size_Type size_type;

     void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     /// Returns the i-th offset from the hash value.
     inline size_type
     operator()(size_type i) const;
   };

 #include <ext/pb_ds/detail/hash_fn/linear_probe_fn_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<typename Size_Type>
 #define PB_DS_CLASS_C_DEC quadratic_probe_fn<Size_Type>

   /// A probe sequence policy using square increments.
   template<typename Size_Type = std::size_t>
   class quadratic_probe_fn
   {
   public:
     typedef Size_Type size_type;

     void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     /// Returns the i-th offset from the hash value.
     inline size_type
     operator()(size_type i) const;
   };

 #include <ext/pb_ds/detail/hash_fn/quadratic_probe_fn_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<typename Size_Type>
 #define PB_DS_CLASS_C_DEC direct_mask_range_hashing<Size_Type>

   /// A mask range-hashing class (uses a bitmask).
   template<typename Size_Type = std::size_t>
   class direct_mask_range_hashing
   : public detail::mask_based_range_hashing<Size_Type>
   {
   private:
     typedef detail::mask_based_range_hashing<Size_Type> mask_based_base;

   public:
     typedef Size_Type size_type;

     void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     void
     notify_resized(size_type size);

     /// Transforms the __hash value hash into a ranged-hash value
     /// (using a bit-mask).
     inline size_type
     operator()(size_type hash) const;
   };

 #include <ext/pb_ds/detail/hash_fn/direct_mask_range_hashing_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<typename Size_Type>
 #define PB_DS_CLASS_C_DEC direct_mod_range_hashing<Size_Type>

   /// A mod range-hashing class (uses the modulo function).
   template<typename Size_Type = std::size_t>
   class direct_mod_range_hashing
   : public detail::mod_based_range_hashing<Size_Type>
   {
   public:
     typedef Size_Type size_type;

     void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     void
     notify_resized(size_type size);

     /// Transforms the __hash value hash into a ranged-hash value
     /// (using a modulo operation).
     inline size_type
     operator()(size_type hash) const;

   private:
     typedef detail::mod_based_range_hashing<size_type> mod_based_base;
   };

 #include <ext/pb_ds/detail/hash_fn/direct_mod_range_hashing_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<bool External_Load_Access, typename Size_Type>
 #define PB_DS_CLASS_C_DEC hash_load_check_resize_trigger<External_Load_Access, Size_Type>
 #define PB_DS_SIZE_BASE_C_DEC detail::hash_load_check_resize_trigger_size_base<Size_Type, External_Load_Access>

   /// A resize trigger policy based on a load check. It keeps the
   /// load factor between some load factors load_min and load_max.
   template<bool External_Load_Access = false, typename Size_Type = std::size_t>
   class hash_load_check_resize_trigger : private PB_DS_SIZE_BASE_C_DEC
   {
   public:
     typedef Size_Type size_type;

     enum
       {
 	/// Specifies whether the load factor can be accessed
 	/// externally. The two options have different trade-offs in
 	/// terms of flexibility, genericity, and encapsulation.
 	external_load_access = External_Load_Access
       };

     /// Default constructor, or constructor taking load_min and
     /// load_max load factors between which this policy will keep the
     /// actual load.
     hash_load_check_resize_trigger(float load_min = 0.125,
 				   float load_max = 0.5);

     void
     swap(hash_load_check_resize_trigger& other);

     virtual
     ~hash_load_check_resize_trigger();

     /// Returns a pair of the minimal and maximal loads, respectively.
     inline std::pair<float, float>
     get_loads() const;

     /// Sets the loads through a pair of the minimal and maximal
     /// loads, respectively.
     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();

     /// Notifies an element was inserted. The total number of entries
     /// in the table is num_entries.
     inline void
     notify_inserted(size_type num_entries);

     inline void
     notify_erased(size_type num_entries);

     /// Notifies the table was cleared.
     void
     notify_cleared();

     /// Notifies the table was resized as a result of this object's
     /// signifying that a resize is needed.
     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;

   private:
     virtual void
     do_resize(size_type new_size);

     typedef PB_DS_SIZE_BASE_C_DEC size_base;

 #ifdef _GLIBCXX_DEBUG
     void
     assert_valid(const char* file, int line) const;
 #endif

     float 	m_load_min;
     float 	m_load_max;
     size_type 	m_next_shrink_size;
     size_type 	m_next_grow_size;
     bool 	m_resize_needed;
   };

 #include <ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC
 #undef PB_DS_SIZE_BASE_C_DEC

 #define PB_DS_CLASS_T_DEC template<bool External_Load_Access, typename Size_Type>
 #define PB_DS_CLASS_C_DEC cc_hash_max_collision_check_resize_trigger<External_Load_Access, Size_Type>

   /// A resize trigger policy based on collision checks. It keeps the
   /// simulated load factor lower than some given load factor.
   template<bool External_Load_Access = false, typename Size_Type = std::size_t>
   class cc_hash_max_collision_check_resize_trigger
   {
   public:
     typedef Size_Type 	size_type;

     enum
       {
 	/// Specifies whether the load factor can be accessed
 	/// externally. The two options have different trade-offs in
 	/// terms of flexibility, genericity, and encapsulation.
 	external_load_access = External_Load_Access
       };

     /// Default constructor, or constructor taking load, a __load
     /// factor which it will attempt to maintain.
     cc_hash_max_collision_check_resize_trigger(float load = 0.5);

     void
     swap(PB_DS_CLASS_C_DEC& other);

     /// Returns the current load.
     inline float
     get_load() const;

     /// Sets the load; does not resize the container.
     void
     set_load(float load);

   protected:
     /// Notifies an insert search started.
     inline void
     notify_insert_search_start();

     /// Notifies a search encountered a collision.
     inline void
     notify_insert_search_collision();

     /// Notifies a search ended.
     inline void
     notify_insert_search_end();

     /// Notifies a find search started.
     inline void
     notify_find_search_start();

     /// Notifies a search encountered a collision.
     inline void
     notify_find_search_collision();

     /// Notifies a search ended.
     inline void
     notify_find_search_end();

     /// Notifies an erase search started.
     inline void
     notify_erase_search_start();

     /// Notifies a search encountered a collision.
     inline void
     notify_erase_search_collision();

     /// Notifies a search ended.
     inline void
     notify_erase_search_end();

     /// Notifies an element was inserted.
     inline void
     notify_inserted(size_type num_entries);

     /// Notifies an element was erased.
     inline void
     notify_erased(size_type num_entries);

     /// Notifies the table was cleared.
     void
     notify_cleared();

     /// Notifies the table was resized as a result of this object's
     /// signifying that a resize is needed.
     void
     notify_resized(size_type new_size);

     /// Notifies the table was resized externally.
     void
     notify_externally_resized(size_type new_size);

     /// Queries whether a resize is needed.
     inline bool
     is_resize_needed() const;

     /// Queries whether a grow is needed. This method is called only
     /// if this object indicated is needed.
     inline bool
     is_grow_needed(size_type size, size_type num_entries) const;

   private:
     void
     calc_max_num_coll();

     inline void
     calc_resize_needed();

     float 	m_load;
     size_type 	m_size;
     size_type 	m_num_col;
     size_type 	m_max_col;
     bool 	m_resize_needed;
   };

 #include <ext/pb_ds/detail/resize_policy/cc_hash_max_collision_check_resize_trigger_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<typename Size_Type>
 #define PB_DS_CLASS_C_DEC hash_exponential_size_policy<Size_Type>

   /// A size policy whose sequence of sizes form an exponential
   /// sequence (typically powers of 2.
   template<typename Size_Type = std::size_t>
   class hash_exponential_size_policy
   {
   public:
     typedef Size_Type size_type;

     /// Default constructor, or onstructor taking a start_size, or
     /// constructor taking a start size and grow_factor. The policy
     /// will use the sequence of sizes start_size, start_size*
     /// grow_factor, start_size* grow_factor^2, ...
     hash_exponential_size_policy(size_type start_size = 8,
 				 size_type grow_factor = 2);

     void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     size_type
     get_nearest_larger_size(size_type size) const;

     size_type
     get_nearest_smaller_size(size_type size) const;

   private:
     size_type m_start_size;
     size_type m_grow_factor;
   };

 #include <ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC
 #define PB_DS_CLASS_C_DEC hash_prime_size_policy

   /// A size policy whose sequence of sizes form a nearly-exponential
   /// sequence of primes.
   class hash_prime_size_policy
   {
   public:
     /// Size type.
     typedef std::size_t size_type;

     /// Default constructor, or onstructor taking a start_size The
     /// policy will use the sequence of sizes approximately
     /// start_size, start_size* 2, start_size* 2^2, ...
     hash_prime_size_policy(size_type start_size = 8);

     inline void
     swap(PB_DS_CLASS_C_DEC& other);

   protected:
     size_type
     get_nearest_larger_size(size_type size) const;

     size_type
     get_nearest_smaller_size(size_type size) const;

   private:
     size_type m_start_size;
   };

 #include <ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 #define PB_DS_CLASS_T_DEC template<typename Size_Policy, typename Trigger_Policy, bool External_Size_Access, typename Size_Type>

 #define PB_DS_CLASS_C_DEC hash_standard_resize_policy<Size_Policy, Trigger_Policy, External_Size_Access, Size_Type>

   /// A resize policy which delegates operations to size and trigger policies.
   template<typename Size_Policy = hash_exponential_size_policy<>,
 	   typename Trigger_Policy = hash_load_check_resize_trigger<>,
 	   bool External_Size_Access = false,
 	   typename Size_Type = std::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
       };

     /// Default constructor.
     hash_standard_resize_policy();

     /// constructor taking some policies r_size_policy will be copied
     /// by the Size_Policy object of this object.
     hash_standard_resize_policy(const Size_Policy& r_size_policy);

     /// constructor taking some policies. r_size_policy will be
     /// copied by the Size_Policy object of this
     /// object. r_trigger_policy will be copied by the Trigger_Policy
     /// object of this object.
     hash_standard_resize_policy(const Size_Policy& r_size_policy,
 				const Trigger_Policy& r_trigger_policy);

     virtual
     ~hash_standard_resize_policy();

     inline void
     swap(PB_DS_CLASS_C_DEC& other);

     /// Access to the Size_Policy object used.
     Size_Policy&
     get_size_policy();

     /// Const access to the Size_Policy object used.
     const Size_Policy&
     get_size_policy() const;

     /// Access to the Trigger_Policy object used.
     Trigger_Policy&
     get_trigger_policy();

     /// Access to the Trigger_Policy object used.
     const Trigger_Policy&
     get_trigger_policy() const;

     /// Returns the actual size of the container.
     inline size_type
     get_actual_size() const;

     /// Resizes the container to suggested_new_size, a suggested size
     /// (the actual size will be determined by the Size_Policy
     /// object).
     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);

     inline bool
     is_resize_needed() const;

     /// Queries what the new size should be, when the container is
     /// resized naturally. The current __size of the container is
     /// size, and the number of used entries within the container is
     /// num_used_e.
     size_type
     get_new_size(size_type size, size_type num_used_e) const;

   private:
     /// Resizes to new_size.
     virtual void
     do_resize(size_type new_size);

     typedef Trigger_Policy trigger_policy_base;

     typedef Size_Policy size_policy_base;

     size_type m_size;
   };

 #include <ext/pb_ds/detail/resize_policy/hash_standard_resize_policy_imp.hpp>

 #undef PB_DS_CLASS_T_DEC
 #undef PB_DS_CLASS_C_DEC

 } // namespace __gnu_pbds

 #endif
	// -- 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
	// 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 PB_DS_HASH_POLICY_HPP
	#define PB_DS_HASH_POLICY_HPP

	#include <bits/c++config.h>
	#include <algorithm>
	#include <vector>
	#include <cmath>
	#include <ext/pb_ds/exception.hpp>
	#include <ext/pb_ds/detail/type_utils.hpp>
	#include <ext/pb_ds/detail/hash_fn/mask_based_range_hashing.hpp>
	#include <ext/pb_ds/detail/hash_fn/mod_based_range_hashing.hpp>
	#include <ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_size_base.hpp>

	namespace __gnu_pbds
	{
	#define PB_DS_CLASS_T_DEC template<typename Size_Type>
	#define PB_DS_CLASS_C_DEC linear_probe_fn<Size_Type>

	/// A probe sequence policy using fixed increments.
	template<typename Size_Type = std::size_t>
	class linear_probe_fn
	{
	public:
	typedef Size_Type size_type;

	void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	/// Returns the i-th offset from the hash value.
	inline size_type
	operator()(size_type i) const;
	};

	#include <ext/pb_ds/detail/hash_fn/linear_probe_fn_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<typename Size_Type>
	#define PB_DS_CLASS_C_DEC quadratic_probe_fn<Size_Type>

	/// A probe sequence policy using square increments.
	template<typename Size_Type = std::size_t>
	class quadratic_probe_fn
	{
	public:
	typedef Size_Type size_type;

	void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	/// Returns the i-th offset from the hash value.
	inline size_type
	operator()(size_type i) const;
	};

	#include <ext/pb_ds/detail/hash_fn/quadratic_probe_fn_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<typename Size_Type>
	#define PB_DS_CLASS_C_DEC direct_mask_range_hashing<Size_Type>

	/// A mask range-hashing class (uses a bitmask).
	template<typename Size_Type = std::size_t>
	class direct_mask_range_hashing
	: public detail::mask_based_range_hashing<Size_Type>
	{
	private:
	typedef detail::mask_based_range_hashing<Size_Type> mask_based_base;

	public:
	typedef Size_Type size_type;

	void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	void
	notify_resized(size_type size);

	/// Transforms the __hash value hash into a ranged-hash value
	/// (using a bit-mask).
	inline size_type
	operator()(size_type hash) const;
	};

	#include <ext/pb_ds/detail/hash_fn/direct_mask_range_hashing_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<typename Size_Type>
	#define PB_DS_CLASS_C_DEC direct_mod_range_hashing<Size_Type>

	/// A mod range-hashing class (uses the modulo function).
	template<typename Size_Type = std::size_t>
	class direct_mod_range_hashing
	: public detail::mod_based_range_hashing<Size_Type>
	{
	public:
	typedef Size_Type size_type;

	void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	void
	notify_resized(size_type size);

	/// Transforms the __hash value hash into a ranged-hash value
	/// (using a modulo operation).
	inline size_type
	operator()(size_type hash) const;

	private:
	typedef detail::mod_based_range_hashing<size_type> mod_based_base;
	};

	#include <ext/pb_ds/detail/hash_fn/direct_mod_range_hashing_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<bool External_Load_Access, typename Size_Type>
	#define PB_DS_CLASS_C_DEC hash_load_check_resize_trigger<External_Load_Access, Size_Type>
	#define PB_DS_SIZE_BASE_C_DEC detail::hash_load_check_resize_trigger_size_base<Size_Type, External_Load_Access>

	/// A resize trigger policy based on a load check. It keeps the
	/// load factor between some load factors load_min and load_max.
	template<bool External_Load_Access = false, typename Size_Type = std::size_t>
	class hash_load_check_resize_trigger : private PB_DS_SIZE_BASE_C_DEC
	{
	public:
	typedef Size_Type size_type;

	enum
	{
	/// Specifies whether the load factor can be accessed
	/// externally. The two options have different trade-offs in
	/// terms of flexibility, genericity, and encapsulation.
	external_load_access = External_Load_Access
	};

	/// Default constructor, or constructor taking load_min and
	/// load_max load factors between which this policy will keep the
	/// actual load.
	hash_load_check_resize_trigger(float load_min = 0.125,
	float load_max = 0.5);

	void
	swap(hash_load_check_resize_trigger& other);

	virtual
	~hash_load_check_resize_trigger();

	/// Returns a pair of the minimal and maximal loads, respectively.
	inline std::pair<float, float>
	get_loads() const;

	/// Sets the loads through a pair of the minimal and maximal
	/// loads, respectively.
	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();

	/// Notifies an element was inserted. The total number of entries
	/// in the table is num_entries.
	inline void
	notify_inserted(size_type num_entries);

	inline void
	notify_erased(size_type num_entries);

	/// Notifies the table was cleared.
	void
	notify_cleared();

	/// Notifies the table was resized as a result of this object's
	/// signifying that a resize is needed.
	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;

	private:
	virtual void
	do_resize(size_type new_size);

	typedef PB_DS_SIZE_BASE_C_DEC size_base;

	#ifdef _GLIBCXX_DEBUG
	void
	assert_valid(const char* file, int line) const;
	#endif

	float m_load_min;
	float m_load_max;
	size_type m_next_shrink_size;
	size_type m_next_grow_size;
	bool m_resize_needed;
	};

	#include <ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC
	#undef PB_DS_SIZE_BASE_C_DEC

	#define PB_DS_CLASS_T_DEC template<bool External_Load_Access, typename Size_Type>
	#define PB_DS_CLASS_C_DEC cc_hash_max_collision_check_resize_trigger<External_Load_Access, Size_Type>

	/// A resize trigger policy based on collision checks. It keeps the
	/// simulated load factor lower than some given load factor.
	template<bool External_Load_Access = false, typename Size_Type = std::size_t>
	class cc_hash_max_collision_check_resize_trigger
	{
	public:
	typedef Size_Type size_type;

	enum
	{
	/// Specifies whether the load factor can be accessed
	/// externally. The two options have different trade-offs in
	/// terms of flexibility, genericity, and encapsulation.
	external_load_access = External_Load_Access
	};

	/// Default constructor, or constructor taking load, a __load
	/// factor which it will attempt to maintain.
	cc_hash_max_collision_check_resize_trigger(float load = 0.5);

	void
	swap(PB_DS_CLASS_C_DEC& other);

	/// Returns the current load.
	inline float
	get_load() const;

	/// Sets the load; does not resize the container.
	void
	set_load(float load);

	protected:
	/// Notifies an insert search started.
	inline void
	notify_insert_search_start();

	/// Notifies a search encountered a collision.
	inline void
	notify_insert_search_collision();

	/// Notifies a search ended.
	inline void
	notify_insert_search_end();

	/// Notifies a find search started.
	inline void
	notify_find_search_start();

	/// Notifies a search encountered a collision.
	inline void
	notify_find_search_collision();

	/// Notifies a search ended.
	inline void
	notify_find_search_end();

	/// Notifies an erase search started.
	inline void
	notify_erase_search_start();

	/// Notifies a search encountered a collision.
	inline void
	notify_erase_search_collision();

	/// Notifies a search ended.
	inline void
	notify_erase_search_end();

	/// Notifies an element was inserted.
	inline void
	notify_inserted(size_type num_entries);

	/// Notifies an element was erased.
	inline void
	notify_erased(size_type num_entries);

	/// Notifies the table was cleared.
	void
	notify_cleared();

	/// Notifies the table was resized as a result of this object's
	/// signifying that a resize is needed.
	void
	notify_resized(size_type new_size);

	/// Notifies the table was resized externally.
	void
	notify_externally_resized(size_type new_size);

	/// Queries whether a resize is needed.
	inline bool
	is_resize_needed() const;

	/// Queries whether a grow is needed. This method is called only
	/// if this object indicated is needed.
	inline bool
	is_grow_needed(size_type size, size_type num_entries) const;

	private:
	void
	calc_max_num_coll();

	inline void
	calc_resize_needed();

	float m_load;
	size_type m_size;
	size_type m_num_col;
	size_type m_max_col;
	bool m_resize_needed;
	};

	#include <ext/pb_ds/detail/resize_policy/cc_hash_max_collision_check_resize_trigger_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<typename Size_Type>
	#define PB_DS_CLASS_C_DEC hash_exponential_size_policy<Size_Type>

	/// A size policy whose sequence of sizes form an exponential
	/// sequence (typically powers of 2.
	template<typename Size_Type = std::size_t>
	class hash_exponential_size_policy
	{
	public:
	typedef Size_Type size_type;

	/// Default constructor, or onstructor taking a start_size, or
	/// constructor taking a start size and grow_factor. The policy
	/// will use the sequence of sizes start_size, start_size*
	/// grow_factor, start_size* grow_factor^2, ...
	hash_exponential_size_policy(size_type start_size = 8,
	size_type grow_factor = 2);

	void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	size_type
	get_nearest_larger_size(size_type size) const;

	size_type
	get_nearest_smaller_size(size_type size) const;

	private:
	size_type m_start_size;
	size_type m_grow_factor;
	};

	#include <ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC
	#define PB_DS_CLASS_C_DEC hash_prime_size_policy

	/// A size policy whose sequence of sizes form a nearly-exponential
	/// sequence of primes.
	class hash_prime_size_policy
	{
	public:
	/// Size type.
	typedef std::size_t size_type;

	/// Default constructor, or onstructor taking a start_size The
	/// policy will use the sequence of sizes approximately
	/// start_size, start_size* 2, start_size* 2^2, ...
	hash_prime_size_policy(size_type start_size = 8);

	inline void
	swap(PB_DS_CLASS_C_DEC& other);

	protected:
	size_type
	get_nearest_larger_size(size_type size) const;

	size_type
	get_nearest_smaller_size(size_type size) const;

	private:
	size_type m_start_size;
	};

	#include <ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	#define PB_DS_CLASS_T_DEC template<typename Size_Policy, typename Trigger_Policy, bool External_Size_Access, typename Size_Type>

	#define PB_DS_CLASS_C_DEC hash_standard_resize_policy<Size_Policy, Trigger_Policy, External_Size_Access, Size_Type>

	/// A resize policy which delegates operations to size and trigger policies.
	template<typename Size_Policy = hash_exponential_size_policy<>,
	typename Trigger_Policy = hash_load_check_resize_trigger<>,
	bool External_Size_Access = false,
	typename Size_Type = std::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
	};

	/// Default constructor.
	hash_standard_resize_policy();

	/// constructor taking some policies r_size_policy will be copied
	/// by the Size_Policy object of this object.
	hash_standard_resize_policy(const Size_Policy& r_size_policy);

	/// constructor taking some policies. r_size_policy will be
	/// copied by the Size_Policy object of this
	/// object. r_trigger_policy will be copied by the Trigger_Policy
	/// object of this object.
	hash_standard_resize_policy(const Size_Policy& r_size_policy,
	const Trigger_Policy& r_trigger_policy);

	virtual
	~hash_standard_resize_policy();

	inline void
	swap(PB_DS_CLASS_C_DEC& other);

	/// Access to the Size_Policy object used.
	Size_Policy&
	get_size_policy();

	/// Const access to the Size_Policy object used.
	const Size_Policy&
	get_size_policy() const;

	/// Access to the Trigger_Policy object used.
	Trigger_Policy&
	get_trigger_policy();

	/// Access to the Trigger_Policy object used.
	const Trigger_Policy&
	get_trigger_policy() const;

	/// Returns the actual size of the container.
	inline size_type
	get_actual_size() const;

	/// Resizes the container to suggested_new_size, a suggested size
	/// (the actual size will be determined by the Size_Policy
	/// object).
	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);

	inline bool
	is_resize_needed() const;

	/// Queries what the new size should be, when the container is
	/// resized naturally. The current __size of the container is
	/// size, and the number of used entries within the container is
	/// num_used_e.
	size_type
	get_new_size(size_type size, size_type num_used_e) const;

	private:
	/// Resizes to new_size.
	virtual void
	do_resize(size_type new_size);

	typedef Trigger_Policy trigger_policy_base;

	typedef Size_Policy size_policy_base;

	size_type m_size;
	};

	#include <ext/pb_ds/detail/resize_policy/hash_standard_resize_policy_imp.hpp>

	#undef PB_DS_CLASS_T_DEC
	#undef PB_DS_CLASS_C_DEC

	} // namespace __gnu_pbds

	#endif