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// -*- C++ -*-
// Copyright (C) 2005-2019 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 sample_update_policy.hpp
* Contains a sample policy for list update containers.
*/
#ifndef PB_DS_SAMPLE_UPDATE_POLICY_HPP
#define PB_DS_SAMPLE_UPDATE_POLICY_HPP
namespace __gnu_pbds
{
/// A sample list-update policy.
struct sample_update_policy
{
/// Default constructor.
sample_update_policy();
/// Copy constructor.
sample_update_policy(const sample_update_policy&);
/// Swaps content.
inline void
swap(sample_update_policy& other);
protected:
/// Metadata on which this functor operates.
typedef some_metadata_type metadata_type;
/// Creates a metadata object.
metadata_type
operator()() const;
/// Decides whether a metadata object should be moved to the front
/// of the list. A list-update based containers object will call
/// this method to decide whether to move a node to the front of
/// the list. The method shoule return true if the node should be
/// moved to the front of the list.
bool
operator()(metadata_reference) const;
};
}
#endif
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