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Diffstat (limited to 'libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp')
-rw-r--r-- | libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp b/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp new file mode 100644 index 00000000000..ca98d9b5086 --- /dev/null +++ b/libstdc++-v3/include/ext/pb_ds/detail/resize_policy/hash_exponential_size_policy_imp.hpp @@ -0,0 +1,106 @@ +// -*- 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_exponential_size_policy_imp.hpp + * Contains a resize size policy implementation. + */ + +PB_DS_CLASS_T_DEC +PB_DS_CLASS_C_DEC:: +hash_exponential_size_policy(size_type start_size, size_type grow_factor) : + m_start_size(start_size), + m_grow_factor(grow_factor) +{ } + +PB_DS_CLASS_T_DEC +void +PB_DS_CLASS_C_DEC:: +swap(PB_DS_CLASS_C_DEC& other) +{ + std::swap(m_start_size, other.m_start_size); + + std::swap(m_grow_factor, other.m_grow_factor); +} + +PB_DS_CLASS_T_DEC +typename PB_DS_CLASS_C_DEC::size_type +PB_DS_CLASS_C_DEC:: +get_nearest_larger_size(size_type size) const +{ + size_type ret = m_start_size; + + while (ret <= size) + { + const size_type next_ret = ret* m_grow_factor; + + if (next_ret < ret) + throw insert_error(); + + ret = next_ret; + } + + return (ret); +} + +PB_DS_CLASS_T_DEC +typename PB_DS_CLASS_C_DEC::size_type +PB_DS_CLASS_C_DEC:: +get_nearest_smaller_size(size_type size) const +{ + size_type ret = m_start_size; + + while (true) + { + const size_type next_ret = ret* m_grow_factor; + + if (next_ret < ret) + throw resize_error(); + + if (next_ret >= size) + return (ret); + + ret = next_ret; + } + + return (ret); +} + |