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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libstdc++-v3/] [include/] [ext/] [pb_ds/] [list_update_policy.hpp] - Rev 424
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// -*- 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