URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [libstdc++-v3/] [include/] [ext/] [pb_ds/] [detail/] [binary_heap_/] [resize_policy.hpp] - Rev 516
Compare with Previous | Blame | View Log
// -*- C++ -*- // Copyright (C) 2005, 2006, 2009 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 resize_policy.hpp * Contains an implementation class for a binary_heap. */ #ifndef PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP #define PB_DS_BINARY_HEAP_RESIZE_POLICY_HPP #include <debug/debug.h> namespace __gnu_pbds { namespace detail { #define PB_DS_CLASS_T_DEC template<typename Size_Type> #define PB_DS_CLASS_C_DEC resize_policy<Size_Type> template<typename Size_Type> class resize_policy { public: typedef Size_Type size_type; enum { min_size = 16 }; public: inline resize_policy(); inline void swap(PB_DS_CLASS_C_DEC& other); inline bool resize_needed_for_grow(size_type size) const; inline bool resize_needed_for_shrink(size_type size) const; inline bool grow_needed(size_type size) const; inline bool shrink_needed(size_type size) const; inline size_type get_new_size_for_grow() const; inline size_type get_new_size_for_shrink() const; size_type get_new_size_for_arbitrary(size_type size) const; inline void notify_grow_resize(); inline void notify_shrink_resize(); void notify_arbitrary(size_type actual_size); #ifdef _GLIBCXX_DEBUG void assert_valid() const; #endif #ifdef PB_DS_BINARY_HEAP_TRACE_ void trace() const; #endif private: enum { ratio = 8, factor = 2 }; private: size_type m_next_shrink_size; size_type m_next_grow_size; }; PB_DS_CLASS_T_DEC inline PB_DS_CLASS_C_DEC:: resize_policy() : m_next_shrink_size(0), m_next_grow_size(min_size) { _GLIBCXX_DEBUG_ONLY(assert_valid();) } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: swap(PB_DS_CLASS_C_DEC& other) { std::swap(m_next_shrink_size, other.m_next_shrink_size); std::swap(m_next_grow_size, other.m_next_grow_size); } PB_DS_CLASS_T_DEC inline bool PB_DS_CLASS_C_DEC:: resize_needed_for_grow(size_type size) const { _GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size); return size == m_next_grow_size; } PB_DS_CLASS_T_DEC inline bool PB_DS_CLASS_C_DEC:: resize_needed_for_shrink(size_type size) const { _GLIBCXX_DEBUG_ASSERT(size <= m_next_grow_size); return size == m_next_shrink_size; } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: get_new_size_for_grow() const { return m_next_grow_size* factor; } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: get_new_size_for_shrink() const { const size_type half_size = m_next_grow_size / factor; return std::max(static_cast<size_type>(min_size), half_size); } PB_DS_CLASS_T_DEC inline typename PB_DS_CLASS_C_DEC::size_type PB_DS_CLASS_C_DEC:: get_new_size_for_arbitrary(size_type size) const { size_type ret = min_size; while (ret < size) ret *= factor; return ret; } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: notify_grow_resize() { _GLIBCXX_DEBUG_ONLY(assert_valid();) _GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size); m_next_grow_size *= factor; m_next_shrink_size = m_next_grow_size / ratio; _GLIBCXX_DEBUG_ONLY(assert_valid();) } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: notify_shrink_resize() { _GLIBCXX_DEBUG_ONLY(assert_valid();) m_next_shrink_size /= factor; if (m_next_shrink_size == 1) m_next_shrink_size = 0; m_next_grow_size = std::max(m_next_grow_size / factor, static_cast<size_type>(min_size)); _GLIBCXX_DEBUG_ONLY(assert_valid();) } PB_DS_CLASS_T_DEC inline void PB_DS_CLASS_C_DEC:: notify_arbitrary(size_type actual_size) { m_next_grow_size = actual_size; m_next_shrink_size = m_next_grow_size / ratio; _GLIBCXX_DEBUG_ONLY(assert_valid();) } #ifdef _GLIBCXX_DEBUG PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: assert_valid() const { _GLIBCXX_DEBUG_ASSERT(m_next_shrink_size == 0 || m_next_shrink_size* ratio == m_next_grow_size); _GLIBCXX_DEBUG_ASSERT(m_next_grow_size >= min_size); } #endif #ifdef PB_DS_BINARY_HEAP_TRACE_ PB_DS_CLASS_T_DEC void PB_DS_CLASS_C_DEC:: trace() const { std::cerr << "shrink = " << m_next_shrink_size << " grow = " << m_next_grow_size << std::endl; } #endif #undef PB_DS_CLASS_T_DEC #undef PB_DS_CLASS_C_DEC } // namespace detail } // namespace __gnu_pbds #endif