branch_policy.hpp
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// -*- C++ -*-
// Copyright (C) 2005-2013 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
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/**
* @file branch_policy/branch_policy.hpp
* Contains a base class for branch policies.
*/
#ifndef PB_DS_BRANCH_POLICY_BASE_HPP
#define PB_DS_BRANCH_POLICY_BASE_HPP
#include <ext/pb_ds/tag_and_trait.hpp>
namespace __gnu_pbds
{
namespace detail
{
/// Primary template, base class for branch structure policies.
template<typename Node_CItr, typename Node_Itr, typename _Alloc>
struct branch_policy
{
protected:
typedef typename Node_Itr::value_type it_type;
typedef typename std::iterator_traits<it_type>::value_type value_type;
typedef typename value_type::first_type key_type;
typedef typename remove_const<value_type>::type rcvalue_type;
typedef typename remove_const<key_type>::type rckey_type;
typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
typedef typename _Alloc::template rebind<rckey_type>::other rebind_k;
typedef typename rebind_v::reference reference;
typedef typename rebind_v::const_reference const_reference;
typedef typename rebind_v::const_pointer const_pointer;
typedef typename rebind_k::const_reference key_const_reference;
static inline key_const_reference
extract_key(const_reference r_val)
{ return r_val.first; }
virtual it_type
end() = 0;
it_type
end_iterator() const
{ return const_cast<branch_policy*>(this)->end(); }
virtual
~branch_policy() { }
};
/// Specialization for const iterators.
template<typename Node_CItr, typename _Alloc>
struct branch_policy<Node_CItr, Node_CItr, _Alloc>
{
protected:
typedef typename Node_CItr::value_type it_type;
typedef typename std::iterator_traits<it_type>::value_type value_type;
typedef typename remove_const<value_type>::type rcvalue_type;
typedef typename _Alloc::template rebind<rcvalue_type>::other rebind_v;
typedef typename rebind_v::reference reference;
typedef typename rebind_v::const_reference const_reference;
typedef typename rebind_v::const_pointer const_pointer;
typedef value_type key_type;
typedef typename rebind_v::const_reference key_const_reference;
static inline key_const_reference
extract_key(const_reference r_val)
{ return r_val; }
virtual it_type
end() const = 0;
it_type
end_iterator() const
{ return end(); }
virtual
~branch_policy() { }
};
} // namespace detail
} // namespace __gnu_pbds
#endif // #ifndef PB_DS_BRANCH_POLICY_BASE_HPP