tree_policy/node_metadata_selector.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
// 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 tree_policy/node_metadata_selector.hpp
* Contains an implementation class for trees.
*/
#ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
#define PB_DS_TREE_NODE_METADATA_DISPATCH_HPP
#include <ext/pb_ds/detail/branch_policy/null_node_metadata.hpp>
#include <ext/pb_ds/detail/types_traits.hpp>
namespace __gnu_pbds
{
namespace detail
{
/**
* @addtogroup traits Traits
* @{
*/
/// Tree metadata helper.
template<typename Node_Update, bool _BTp>
struct tree_metadata_helper;
/// Specialization, false.
template<typename Node_Update>
struct tree_metadata_helper<Node_Update, false>
{
typedef typename Node_Update::metadata_type type;
};
/// Specialization, true.
template<typename Node_Update>
struct tree_metadata_helper<Node_Update, true>
{
typedef null_type type;
};
/// Tree node metadata dispatch.
template<typename Key,
typename Data,
typename Cmp_Fn,
template<typename Node_CItr,
typename Const_Iterator,
typename Cmp_Fn_,
typename _Alloc_>
class Node_Update,
typename _Alloc>
struct tree_node_metadata_dispatch
{
private:
typedef dumnode_const_iterator<Key, Data, _Alloc> __it_type;
typedef Node_Update<__it_type, __it_type, Cmp_Fn, _Alloc> __node_u;
typedef null_node_update<__it_type, __it_type, Cmp_Fn, _Alloc> __nnode_u;
enum
{
null_update = is_same<__node_u, __nnode_u>::value
};
public:
typedef typename tree_metadata_helper<__node_u, null_update>::type type;
};
//@}
} // namespace detail
} // namespace __gnu_pbds
#endif // #ifndef PB_DS_TREE_NODE_METADATA_DISPATCH_HPP