diff options
Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp')
-rw-r--r-- | gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp new file mode 100644 index 0000000..47f386c --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp @@ -0,0 +1,87 @@ +// -*- C++ -*- + +// Copyright (C) 2005-2014 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 lu_counter_metadata.hpp + * Contains implementation of a lu counter policy's metadata. + */ + +namespace __gnu_pbds +{ + namespace detail + { + template<typename Size_Type> + class lu_counter_policy_base; + + /// A list-update metadata type that moves elements to the front of + /// the list based on the counter algorithm. + template<typename Size_Type = std::size_t> + class lu_counter_metadata + { + public: + typedef Size_Type size_type; + + private: + lu_counter_metadata(size_type init_count) : m_count(init_count) + { } + + friend class lu_counter_policy_base<size_type>; + + mutable size_type m_count; + }; + + /// Base class for list-update counter policy. + template<typename Size_Type> + class lu_counter_policy_base + { + protected: + typedef Size_Type size_type; + + lu_counter_metadata<size_type> + operator()(size_type max_size) const + { return lu_counter_metadata<Size_Type>(std::rand() % max_size); } + + template<typename Metadata_Reference> + bool + operator()(Metadata_Reference r_data, size_type m_max_count) const + { + if (++r_data.m_count != m_max_count) + return false; + r_data.m_count = 0; + return true; + } + }; + } // namespace detail +} // namespace __gnu_pbds |