// -*- C++ -*-
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// -*- C++ -*-
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// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
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// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
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//
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// Foundation; either version 3, or (at your option) any later
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// version.
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// version.
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// This library is distributed in the hope that it will be useful, but
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// purpose. It is provided "as is" without express or implied
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// warranty.
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// warranty.
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/**
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/**
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* @file resize_policy.hpp
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* @file resize_policy.hpp
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* Contains an implementation class for a binary_heap.
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* Contains an implementation class for a binary_heap.
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*/
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*/
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#ifndef PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP
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#ifndef PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP
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#define PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP
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#define PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP
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#include <debug/debug.h>
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#include <debug/debug.h>
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namespace __gnu_pbds
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namespace __gnu_pbds
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{
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{
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namespace detail
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namespace detail
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{
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{
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#define PB_DS_CLASS_T_DEC template<typename Size_Type>
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#define PB_DS_CLASS_T_DEC template<typename Size_Type>
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#define PB_DS_CLASS_C_DEC resize_policy<Size_Type>
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#define PB_DS_CLASS_C_DEC resize_policy<Size_Type>
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template<typename Size_Type>
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template<typename Size_Type>
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class resize_policy
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class resize_policy
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{
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{
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public:
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public:
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typedef Size_Type size_type;
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typedef Size_Type size_type;
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enum
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enum
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{
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{
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min_size = 16
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min_size = 16
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};
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};
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public:
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public:
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inline
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inline
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resize_policy();
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resize_policy();
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inline void
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inline void
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swap(PB_DS_CLASS_C_DEC& other);
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swap(PB_DS_CLASS_C_DEC& other);
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inline bool
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inline bool
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resize_needed_for_grow(size_type size) const;
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resize_needed_for_grow(size_type size) const;
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inline bool
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inline bool
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resize_needed_for_shrink(size_type size) const;
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resize_needed_for_shrink(size_type size) const;
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inline bool
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inline bool
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grow_needed(size_type size) const;
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grow_needed(size_type size) const;
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inline bool
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inline bool
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shrink_needed(size_type size) const;
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shrink_needed(size_type size) const;
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inline size_type
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inline size_type
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get_new_size_for_grow() const;
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get_new_size_for_grow() const;
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inline size_type
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inline size_type
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get_new_size_for_shrink() const;
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get_new_size_for_shrink() const;
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size_type
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size_type
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get_new_size_for_arbitrary(size_type size) const;
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get_new_size_for_arbitrary(size_type size) const;
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inline void
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inline void
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notify_grow_resize();
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notify_grow_resize();
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inline void
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inline void
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notify_shrink_resize();
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notify_shrink_resize();
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void
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void
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notify_arbitrary(size_type actual_size);
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notify_arbitrary(size_type actual_size);
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#ifdef _GLIBCXX_DEBUG
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#ifdef _GLIBCXX_DEBUG
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void
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void
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assert_valid() const;
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assert_valid() const;
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#endif
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#endif
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#ifdef PB_DS_BINARY_HEAP_TRACE_
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#ifdef PB_DS_BINARY_HEAP_TRACE_
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void
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void
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trace() const;
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trace() const;
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#endif
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#endif
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private:
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private:
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enum
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enum
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{
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{
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ratio = 8,
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ratio = 8,
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factor = 2
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factor = 2
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};
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};
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private:
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private:
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size_type m_next_shrink_size;
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size_type m_next_shrink_size;
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size_type m_next_grow_size;
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size_type m_next_grow_size;
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};
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};
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline
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inline
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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resize_policy() :
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resize_policy() :
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m_next_shrink_size(0),
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m_next_shrink_size(0),
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m_next_grow_size(min_size)
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m_next_grow_size(min_size)
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{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
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{ _GLIBCXX_DEBUG_ONLY(assert_valid();) }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline void
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inline void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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swap(PB_DS_CLASS_C_DEC& other)
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swap(PB_DS_CLASS_C_DEC& other)
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{
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{
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std::swap(m_next_shrink_size, other.m_next_shrink_size);
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std::swap(m_next_shrink_size, other.m_next_shrink_size);
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std::swap(m_next_grow_size, other.m_next_grow_size);
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std::swap(m_next_grow_size, other.m_next_grow_size);
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline bool
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inline bool
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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resize_needed_for_grow(size_type size) const
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resize_needed_for_grow(size_type size) const
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{
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{
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_GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size);
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_GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size);
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return size == m_next_grow_size;
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return size == m_next_grow_size;
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline bool
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inline bool
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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resize_needed_for_shrink(size_type size) const
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resize_needed_for_shrink(size_type size) const
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{
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{
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_GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size);
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_GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size);
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return size == m_next_shrink_size;
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return size == m_next_shrink_size;
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::size_type
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inline typename PB_DS_CLASS_C_DEC::size_type
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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get_new_size_for_grow() const
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get_new_size_for_grow() const
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{ return m_next_grow_size* factor; }
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{ return m_next_grow_size* factor; }
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::size_type
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inline typename PB_DS_CLASS_C_DEC::size_type
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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get_new_size_for_shrink() const
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get_new_size_for_shrink() const
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{
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{
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const size_type half_size = m_next_grow_size / factor;
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const size_type half_size = m_next_grow_size / factor;
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return std::max(static_cast<size_type>(min_size), half_size);
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return std::max(static_cast<size_type>(min_size), half_size);
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline typename PB_DS_CLASS_C_DEC::size_type
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inline typename PB_DS_CLASS_C_DEC::size_type
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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get_new_size_for_arbitrary(size_type size) const
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get_new_size_for_arbitrary(size_type size) const
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{
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{
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size_type ret = min_size;
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size_type ret = min_size;
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while (ret < size)
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while (ret < size)
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ret *= factor;
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ret *= factor;
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return ret;
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return ret;
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline void
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inline void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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notify_grow_resize()
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notify_grow_resize()
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{
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{
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size);
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_GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size);
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m_next_grow_size *= factor;
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m_next_grow_size *= factor;
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m_next_shrink_size = m_next_grow_size / ratio;
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m_next_shrink_size = m_next_grow_size / ratio;
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline void
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inline void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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notify_shrink_resize()
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notify_shrink_resize()
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{
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{
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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m_next_shrink_size /= factor;
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m_next_shrink_size /= factor;
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if (m_next_shrink_size == 1)
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if (m_next_shrink_size == 1)
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m_next_shrink_size = 0;
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m_next_shrink_size = 0;
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m_next_grow_size =
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m_next_grow_size =
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std::max(m_next_grow_size / factor, static_cast<size_type>(min_size));
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std::max(m_next_grow_size / factor, static_cast<size_type>(min_size));
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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}
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}
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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inline void
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inline void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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notify_arbitrary(size_type actual_size)
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notify_arbitrary(size_type actual_size)
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{
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{
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m_next_grow_size = actual_size;
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m_next_grow_size = actual_size;
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m_next_shrink_size = m_next_grow_size / ratio;
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m_next_shrink_size = m_next_grow_size / ratio;
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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_GLIBCXX_DEBUG_ONLY(assert_valid();)
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}
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}
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#ifdef _GLIBCXX_DEBUG
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#ifdef _GLIBCXX_DEBUG
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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void
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void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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assert_valid() const
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assert_valid() const
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{
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{
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_GLIBCXX_DEBUG_ASSERT(m_next_shrink_size == 0 ||
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_GLIBCXX_DEBUG_ASSERT(m_next_shrink_size == 0 ||
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m_next_shrink_size* ratio == m_next_grow_size);
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m_next_shrink_size* ratio == m_next_grow_size);
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_GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size);
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_GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size);
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}
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}
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#endif
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#endif
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#ifdef PB_DS_BINARY_HEAP_TRACE_
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#ifdef PB_DS_BINARY_HEAP_TRACE_
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PB_DS_CLASS_T_DEC
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PB_DS_CLASS_T_DEC
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void
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void
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PB_DS_CLASS_C_DEC::
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PB_DS_CLASS_C_DEC::
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trace() const
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trace() const
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{
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{
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std::cerr << "shrink = " << m_next_shrink_size <<
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std::cerr << "shrink = " << m_next_shrink_size <<
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" grow = " << m_next_grow_size << std::endl;
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" grow = " << m_next_grow_size << std::endl;
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}
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}
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#endif
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#endif
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_T_DEC
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#undef PB_DS_CLASS_C_DEC
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#undef PB_DS_CLASS_C_DEC
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} // namespace detail
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} // namespace detail
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} // namespace __gnu_pbds
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} // namespace __gnu_pbds
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#endif
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#endif
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