90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
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/*
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BUFFER-LOCAL-KEY.hpp - opaque data for BufferProvider implementation
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef PROC_ENGINE_BUFFR_LOCAL_KEY_H
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#define PROC_ENGINE_BUFFR_LOCAL_KEY_H
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#include "lib/error.hpp"
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#include <boost/functional/hash.hpp>
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namespace lib {
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typedef size_t HashVal;
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}
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namespace engine {
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namespace metadata {
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class Key;
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class Entry;
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}
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class BufferMetadata;
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using lib::HashVal;
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/**
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* an opaque ID to be used by the BufferProvider implementation.
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* Typically this will be used, to set apart some pre-registered
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* kinds of buffers. It is treated as being part of the buffer type.
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* LocalKey objects may be copied but not re-assigned or changed.
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*/
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class LocalKey
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{
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uint64_t privateID_;
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public:
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LocalKey (uint64_t opaqueValue=0)
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: privateID_(opaqueValue)
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{ }
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operator uint64_t() const { return privateID_; }
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bool isDefined() const { return bool(privateID_); }
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friend size_t
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hash_value (LocalKey const& lkey)
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{
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boost::hash<uint64_t> hashFunction;
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return hashFunction(lkey.privateID_);
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}
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private:
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/** assignment usually prohibited */
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LocalKey& operator= (LocalKey const& o)
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{
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privateID_ = o.privateID_;
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return *this;
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}
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/** but Key assignments are acceptable */
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friend class metadata::Key;
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};
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} // namespace engine
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#endif
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