mirror of
https://github.com/matrix-construct/construct
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56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
// 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. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_M_EVENT_REFS_H
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namespace ircd::m::dbs
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{
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//NOTE: this is a forward declaration for the reference type enumeration
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//NOTE: which is defined in the dbs/ system rather than here, for now.
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enum class ref :uint8_t;
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}
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/// Interface to the forward-references for an event. Forward-references are
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/// virtually constructed from prev-references made by other events. This
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/// interface queries the database which has pre-indexed the prev-references
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/// made by other events at their insertion (it does not conduct any expensive
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/// scan when using this interface, etc).
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struct ircd::m::event::refs
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{
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event::idx idx;
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public:
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using closure = std::function<bool (const event::idx &, const dbs::ref &)>;
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bool for_each(const dbs::ref &type, const closure &) const;
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bool for_each(const closure &) const;
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bool has(const dbs::ref &type, const event::idx &) const;
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bool has(const dbs::ref &type) const;
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bool has(const event::idx &) const;
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size_t count(const dbs::ref &type) const;
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size_t count() const;
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bool prefetch(const dbs::ref &type) const;
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bool prefetch() const;
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refs(const event::idx &idx) noexcept;
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static void rebuild();
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};
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inline
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ircd::m::event::refs::refs(const event::idx &idx)
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noexcept
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:idx{idx}
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{}
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