// -*- C++ -*-
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// Copyright (C) 2005-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file branch_policy/branch_policy.hpp
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* Contains a base class for branch policies.
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*/
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#ifndef PB_DS_BRANCH_POLICY_BASE_HPP
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#define PB_DS_BRANCH_POLICY_BASE_HPP
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#include <ext/pb_ds/tag_and_trait.hpp>
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namespace __gnu_pbds
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{
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namespace detail
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{
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/// Primary template, base class for branch structure policies.
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template<typename Node_CItr, typename Node_Itr, typename _Alloc>
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struct branch_policy
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{
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protected:
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typedef typename Node_Itr::value_type it_type;
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typedef typename std::iterator_traits<it_type>::value_type value_type;
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typedef typename value_type::first_type key_type;
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typedef typename remove_const<value_type>::type rcvalue_type;
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typedef typename remove_const<key_type>::type rckey_type;
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typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
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typedef typename _Alloc::template rebind<rckey_type>::other rebind_k;
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typedef typename rebind_v::reference reference;
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typedef typename rebind_v::const_reference const_reference;
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typedef typename rebind_v::const_pointer const_pointer;
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typedef typename rebind_k::const_reference key_const_reference;
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static inline key_const_reference
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extract_key(const_reference r_val)
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{ return r_val.first; }
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virtual it_type
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end() = 0;
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it_type
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end_iterator() const
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{ return const_cast<branch_policy*>(this)->end(); }
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virtual
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~branch_policy() { }
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};
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/// Specialization for const iterators.
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template<typename Node_CItr, typename _Alloc>
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struct branch_policy<Node_CItr, Node_CItr, _Alloc>
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{
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protected:
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typedef typename Node_CItr::value_type it_type;
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typedef typename std::iterator_traits<it_type>::value_type value_type;
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typedef typename remove_const<value_type>::type rcvalue_type;
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typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
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typedef typename rebind_v::reference reference;
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typedef typename rebind_v::const_reference const_reference;
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typedef typename rebind_v::const_pointer const_pointer;
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typedef value_type key_type;
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typedef typename rebind_v::const_reference key_const_reference;
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static inline key_const_reference
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extract_key(const_reference r_val)
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{ return r_val; }
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virtual it_type
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end() const = 0;
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it_type
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end_iterator() const
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{ return end(); }
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virtual
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~branch_policy() { }
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};
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} // namespace detail
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} // namespace __gnu_pbds
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#endif // #ifndef PB_DS_BRANCH_POLICY_BASE_HPP
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