diff options
Diffstat (limited to 'libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp')
| -rw-r--r-- | libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp b/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp new file mode 100644 index 00000000000..2b05dd1d176 --- /dev/null +++ b/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_load_check_resize_trigger_imp.hpp @@ -0,0 +1,359 @@ +// -*- C++ -*- + +// Copyright (C) 2005, 2006 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, 59 Temple Place - Suite 330, Boston, +// MA 02111-1307, 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_load_check_resize_trigger_imp.hpp + * Contains a resize trigger implementation. + */ + +#define PB_DS_STATIC_ASSERT(UNIQUE, E) \ + typedef detail::static_assert_dumclass<sizeof(detail::static_assert<(bool)(E)>)> \ + UNIQUE##static_assert_type + +PB_DS_CLASS_T_DEC +PB_DS_CLASS_C_DEC:: +hash_load_check_resize_trigger(float load_min, float load_max) : + m_load_min(load_min), + m_load_max(load_max), + m_next_shrink_size(0), + m_next_grow_size(0), + m_resize_needed(false) +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_find_search_start() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_find_search_collision() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_find_search_end() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_insert_search_start() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_insert_search_collision() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_insert_search_end() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_erase_search_start() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_erase_search_collision() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_erase_search_end() +{ + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_inserted(size_type num_entries) +{ + m_resize_needed = (num_entries >= m_next_grow_size); + + size_base::set_size(num_entries); + + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline void +PB_DS_CLASS_C_DEC:: +notify_erased(size_type num_entries) +{ + size_base::set_size(num_entries); + + m_resize_needed = + num_entries <= m_next_shrink_size; + + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline bool +PB_DS_CLASS_C_DEC:: +is_resize_needed() const +{ + PB_DS_DBG_ONLY(assert_valid();) + + return (m_resize_needed); +} + +PB_DS_CLASS_T_DEC +inline bool +PB_DS_CLASS_C_DEC:: +is_grow_needed(size_type /*size*/, size_type num_entries) const +{ + PB_DS_DBG_ASSERT(m_resize_needed); + + return (num_entries >= m_next_grow_size); +} + +PB_DS_CLASS_T_DEC +PB_DS_CLASS_C_DEC:: +~hash_load_check_resize_trigger() +{ } + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +notify_resized(size_type new_size) +{ + m_resize_needed = false; + + m_next_grow_size = + size_type(m_load_max* new_size - 1); + + m_next_shrink_size = + size_type(m_load_min* new_size); + +#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + std::cerr << "hlcrt::notify_resized " << + static_cast<unsigned long>(new_size) << " " << + static_cast<unsigned long>(m_load_min) << " " << + static_cast<unsigned long>(m_load_max) << " " << + static_cast<unsigned long>(m_next_shrink_size) << " " << + static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; +#endif // #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +notify_externally_resized(size_type new_size) +{ + m_resize_needed = false; + + size_type new_grow_size = + size_type(m_load_max* new_size - 1); + + size_type new_shrink_size = + size_type(m_load_min* new_size ); + + if (new_grow_size >= m_next_grow_size) + { + PB_DS_DBG_ASSERT(new_shrink_size > m_next_shrink_size); + + m_next_grow_size = new_grow_size; + + PB_DS_DBG_ONLY(assert_valid();) + +#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + std::cerr << "hlcrt::notify_externally_resized1 " << + static_cast<unsigned long>(new_size) << " " << + static_cast<unsigned long>(m_load_min) << " " << + static_cast<unsigned long>(m_load_max) << " " << + static_cast<unsigned long>(m_next_shrink_size) << " " << + static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; +#endif // #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + + return; + } + + PB_DS_DBG_ASSERT(new_shrink_size <= m_next_shrink_size); + + m_next_shrink_size = new_shrink_size; + +#ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + std::cerr << "hlcrt::notify_externally_resized2 " << + static_cast<unsigned long>(new_size) << " " << + static_cast<unsigned long>(m_load_min) << " " << + static_cast<unsigned long>(m_load_max) << " " << + static_cast<unsigned long>(m_next_shrink_size) << " " << + static_cast<unsigned long>(m_next_grow_size) << " " << std::endl; +#endif // #ifdef PB_DS_HT_MAP_RESIZE_TRACE_ + + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +notify_cleared() +{ + PB_DS_DBG_ONLY(assert_valid();) + + size_base::set_size(0); + + m_resize_needed = (0 < m_next_shrink_size); + + PB_DS_DBG_ONLY(assert_valid();) + } + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +swap(PB_DS_CLASS_C_DEC& other) +{ + PB_DS_DBG_ONLY(assert_valid();) + PB_DS_DBG_ONLY(other.assert_valid();) + + size_base::swap(other); + + std::swap(m_load_min, other.m_load_min); + std::swap(m_load_max, other.m_load_max); + + std::swap(m_resize_needed, other.m_resize_needed); + + std::swap(m_next_grow_size, other.m_next_grow_size); + std::swap(m_next_shrink_size, other.m_next_shrink_size); + + PB_DS_DBG_ONLY(assert_valid();) + PB_DS_DBG_ONLY(other.assert_valid();) + } + +PB_DS_CLASS_T_DEC +inline std::pair<float, float> +PB_DS_CLASS_C_DEC:: +get_loads() const +{ + PB_DS_STATIC_ASSERT(access, external_load_access); + + return (std::make_pair(m_load_min, m_load_max)); +} + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +set_loads(std::pair<float, float> load_pair) +{ + PB_DS_STATIC_ASSERT(access, external_load_access); + + const float old_load_min = m_load_min; + const float old_load_max = m_load_max; + const size_type old_next_shrink_size = m_next_shrink_size; + const size_type old_next_grow_size = m_next_grow_size; + const bool old_resize_needed = m_resize_needed; + + try + { + m_load_min = load_pair.first; + m_load_max = load_pair.second; + + do_resize(static_cast<size_type>( + size_base::get_size() / ((m_load_min + m_load_max) / 2))); + } + catch(...) + { + m_load_min = old_load_min; + m_load_max = old_load_max; + m_next_shrink_size = old_next_shrink_size; + m_next_grow_size = old_next_grow_size; + m_resize_needed = old_resize_needed; + + throw; + } +} + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +do_resize(size_type /*new_size*/) +{ + abort(); +} + +#ifdef PB_DS_HASH_POLICY_DEBUG +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +assert_valid() const +{ + PB_DS_DBG_ASSERT(m_load_max > m_load_min); + + PB_DS_DBG_ASSERT(m_next_grow_size >= m_next_shrink_size); +} +#endif // #ifdef PB_DS_HASH_POLICY_DEBUG + +#undef PB_DS_STATIC_ASSERT + |