thin-provisioning-tools/persistent-data/data-structures/ref_counter.h
Joe Thornber 1481ed0f8a [ref_counter] Make ref_counter an abstract base class.
Forces people to override correctly.

Also make no_op_ref_counter final.
2020-04-08 12:22:28 +01:00

51 lines
1.6 KiB
C++

// Copyright (C) 2013 Red Hat, Inc. All rights reserved.
//
// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools 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 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools 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.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef REF_COUNTER_H
#define REF_COUNTER_H
#include <boost/shared_ptr.hpp>
//----------------------------------------------------------------
namespace persistent_data {
template <typename ValueType>
class ref_counter {
public:
boost::shared_ptr<ref_counter<ValueType> > ptr;
virtual ~ref_counter() {}
virtual void set(ValueType const &v, uint32_t rc) = 0;
virtual void inc(ValueType const &v) = 0;
virtual void dec(ValueType const &v) = 0;
};
template <typename ValueType>
class no_op_ref_counter final : public ref_counter<ValueType> {
public:
virtual void set(ValueType const &v, uint32_t rc) {}
virtual void inc(ValueType const &v) {}
virtual void dec(ValueType const &v) {}
};
}
//----------------------------------------------------------------
#endif