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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp')
-rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp b/gcc-4.4.3/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp new file mode 100644 index 000000000..ec05b69c7 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp @@ -0,0 +1,136 @@ +// -*- 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 |