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Diffstat (limited to 'gcc-4.9/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp')
| -rw-r--r-- | gcc-4.9/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/gcc-4.9/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp new file mode 100644 index 000000000..1cc814416 --- /dev/null +++ b/gcc-4.9/libstdc++-v3/include/ext/pb_ds/list_update_policy.hpp @@ -0,0 +1,130 @@ +// -*- 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 list_update_policy.hpp + * Contains policies for list update containers. + */ + +#ifndef PB_DS_LU_POLICY_HPP +#define PB_DS_LU_POLICY_HPP + +#include <bits/c++config.h> +#include <cstdlib> +#include <ext/pb_ds/detail/list_update_policy/lu_counter_metadata.hpp> +#include <ext/pb_ds/tag_and_trait.hpp> + +namespace __gnu_pbds +{ + /** + * A list-update policy that unconditionally moves elements to the + * front of the list. A null type means that each link in a + * list-based container does not actually need metadata. + */ + template<typename _Alloc = std::allocator<char> > + class lu_move_to_front_policy + { + public: + typedef _Alloc allocator_type; + + /// Metadata on which this functor operates. + typedef null_type metadata_type; + + private: + typedef typename _Alloc::template rebind<metadata_type> __rebind_m; + + public: + /// Reference to metadata on which this functor operates. + typedef typename __rebind_m::other::reference metadata_reference; + + /// Creates a metadata object. + metadata_type + operator()() const + { return s_metadata; } + + /// Decides whether a metadata object should be moved to the front + /// of the list. + inline bool + operator()(metadata_reference r_metadata) const + { return true; } + + private: + static null_type s_metadata; + }; + + /** + * A list-update policy that moves elements to the front of the + * list based on the counter algorithm. + */ + template<std::size_t Max_Count = 5, typename _Alloc = std::allocator<char> > + class lu_counter_policy + : private detail::lu_counter_policy_base<typename _Alloc::size_type> + { + public: + typedef _Alloc allocator_type; + typedef typename allocator_type::size_type size_type; + + enum + { + /// When some element is accessed this number of times, it + /// will be moved to the front of the list. + max_count = Max_Count + }; + + /// Metadata on which this functor operates. + typedef detail::lu_counter_metadata<size_type> metadata_type; + + private: + typedef detail::lu_counter_policy_base<size_type> base_type; + typedef typename _Alloc::template rebind<metadata_type> __rebind_m; + + public: + /// Reference to metadata on which this functor operates. + typedef typename __rebind_m::other::reference metadata_reference; + + /// Creates a metadata object. + metadata_type + operator()() const + { return base_type::operator()(max_count); } + + /// Decides whether a metadata object should be moved to the front + /// of the list. + bool + operator()(metadata_reference r_data) const + { return base_type::operator()(r_data, max_count); } + }; +} // namespace __gnu_pbds + +#endif |