51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
// Copyright (C) 2013 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
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//
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// thin-provisioning-tools is free software: you can redistribute it
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// and/or modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// thin-provisioning-tools is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with thin-provisioning-tools. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef REF_COUNTER_H
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#define REF_COUNTER_H
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#include <boost/shared_ptr.hpp>
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//----------------------------------------------------------------
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namespace persistent_data {
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template <typename ValueType>
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class ref_counter {
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public:
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boost::shared_ptr<ref_counter<ValueType> > ptr;
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virtual ~ref_counter() {}
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virtual void set(ValueType const &v, uint32_t rc) = 0;
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virtual void inc(ValueType const &v) = 0;
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virtual void dec(ValueType const &v) = 0;
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};
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template <typename ValueType>
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class no_op_ref_counter final : public ref_counter<ValueType> {
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public:
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virtual void set(ValueType const &v, uint32_t rc) {}
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virtual void inc(ValueType const &v) {}
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virtual void dec(ValueType const &v) {}
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};
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}
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//----------------------------------------------------------------
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#endif
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