mirror of
https://github.com/matrix-construct/construct
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51 lines
2 KiB
C++
51 lines
2 KiB
C++
//
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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// IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#define HAVE_IRCD_DB_SNAPSHOT_H
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// Forward declarations for RocksDB because it is not included here.
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namespace rocksdb
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{
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struct Snapshot;
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}
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/// Database snapshot object. Maintaining this object will maintain a
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/// consistent state of access to the database at the sequence number
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/// from when it's acquired.
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struct ircd::db::database::snapshot
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{
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std::shared_ptr<const rocksdb::Snapshot> s;
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public:
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operator const rocksdb::Snapshot *() const { return s.get(); }
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explicit operator bool() const { return bool(s); }
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bool operator !() const { return !s; }
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explicit snapshot(database &);
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snapshot() = default;
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~snapshot() noexcept;
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friend uint64_t sequence(const snapshot &); // Sequence of a snapshot
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friend uint64_t sequence(const rocksdb::Snapshot *const &);
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};
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