| // -*- C++ -*- |
| |
| // Copyright (C) 2005, 2006, 2007, 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 list_update_policy.hpp |
| * Contains policies for list update containers. |
| */ |
| |
| #ifndef PB_DS_LU_POLICY_HPP |
| #define PB_DS_LU_POLICY_HPP |
| |
| #include <cstdlib> |
| #include <ext/pb_ds/detail/list_update_policy/counter_lu_metadata.hpp> |
| |
| namespace __gnu_pbds |
| { |
| // A null type that means that each link in a list-based container |
| // does not actually need metadata. |
| struct null_lu_metadata |
| { }; |
| |
| #define PB_DS_CLASS_T_DEC template<typename Allocator> |
| #define PB_DS_CLASS_C_DEC move_to_front_lu_policy<Allocator> |
| |
| // A list-update policy that unconditionally moves elements to the |
| // front of the list. |
| template<typename Allocator = std::allocator<char> > |
| class move_to_front_lu_policy |
| { |
| public: |
| typedef Allocator allocator_type; |
| |
| // Metadata on which this functor operates. |
| typedef null_lu_metadata metadata_type; |
| |
| // Reference to metadata on which this functor operates. |
| typedef typename allocator_type::template rebind<metadata_type>::other metadata_rebind; |
| typedef typename metadata_rebind::reference metadata_reference; |
| |
| // Creates a metadata object. |
| metadata_type |
| operator()() const; |
| |
| // Decides whether a metadata object should be moved to the front |
| // of the list. |
| inline bool |
| operator()(metadata_reference r_metadata) const; |
| |
| private: |
| static null_lu_metadata s_metadata; |
| }; |
| |
| #include <ext/pb_ds/detail/list_update_policy/mtf_lu_policy_imp.hpp> |
| |
| #undef PB_DS_CLASS_T_DEC |
| #undef PB_DS_CLASS_C_DEC |
| |
| #define PB_DS_CLASS_T_DEC template<size_t Max_Count, class Allocator> |
| #define PB_DS_CLASS_C_DEC counter_lu_policy<Max_Count, Allocator> |
| |
| // A list-update policy that moves elements to the front of the list |
| // based on the counter algorithm. |
| template<size_t Max_Count = 5, typename Allocator = std::allocator<char> > |
| class counter_lu_policy |
| : private detail::counter_lu_policy_base<typename Allocator::size_type> |
| { |
| public: |
| typedef Allocator allocator_type; |
| |
| enum |
| { |
| max_count = Max_Count |
| }; |
| |
| typedef typename allocator_type::size_type size_type; |
| |
| // Metadata on which this functor operates. |
| typedef detail::counter_lu_metadata<size_type> metadata_type; |
| |
| // Reference to metadata on which this functor operates. |
| typedef typename Allocator::template rebind<metadata_type>::other metadata_rebind; |
| typedef typename metadata_rebind::reference metadata_reference; |
| |
| // Creates a metadata object. |
| metadata_type |
| operator()() const; |
| |
| // Decides whether a metadata object should be moved to the front |
| // of the list. |
| bool |
| operator()(metadata_reference r_metadata) const; |
| |
| private: |
| typedef detail::counter_lu_policy_base<typename Allocator::size_type> base_type; |
| }; |
| |
| #include <ext/pb_ds/detail/list_update_policy/counter_lu_policy_imp.hpp> |
| |
| #undef PB_DS_CLASS_T_DEC |
| #undef PB_DS_CLASS_C_DEC |
| |
| } // namespace __gnu_pbds |
| |
| #endif |