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construct/include/ircd/m/event/refs.h

99 lines
2.5 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_M_EVENT_REFS_H
namespace ircd::m::dbs
{
//NOTE: this is a forward declaration for the reference type enumeration
//NOTE: which is defined in the dbs/ system rather than here, for now.
enum class ref :uint8_t;
}
/// Interface to the forward-references for an event. Forward-references are
/// virtually constructed from prev-references made by other events. This
/// interface queries the database which has pre-indexed the prev-references
/// made by other events at their insertion (it does not conduct any expensive
/// scan when using this interface, etc).
struct ircd::m::event::refs
{
using closure = util::function_bool
<
const event::idx &, const dbs::ref &
>;
event::idx idx;
private:
bool _for_each(const dbs::ref &type, const closure &, const bool ascending) const;
public:
bool for_each(const dbs::ref &type, const closure &) const;
bool for_each(const closure &) const;
bool rfor_each(const dbs::ref &type, const closure &) const;
bool rfor_each(const closure &) const;
bool has(const dbs::ref &type, const event::idx &) const;
bool has(const dbs::ref &type) const;
bool has(const event::idx &) const;
size_t count(const dbs::ref &type) const;
size_t count() const;
bool prefetch(const dbs::ref &type) const;
bool prefetch() const;
refs(const event::idx &idx) noexcept;
static void rebuild();
};
inline
ircd::m::event::refs::refs(const event::idx &idx)
noexcept
:idx{idx}
{}
inline bool
ircd::m::event::refs::rfor_each(const closure &closure)
const
{
return rfor_each(dbs::ref(-1), closure);
}
inline bool
ircd::m::event::refs::rfor_each(const dbs::ref &type,
const closure &closure)
const
{
return idx?
_for_each(type, closure, false):
true;
}
inline bool
ircd::m::event::refs::for_each(const closure &closure)
const
{
return for_each(dbs::ref(-1), closure);
}
inline bool
ircd::m::event::refs::for_each(const dbs::ref &type,
const closure &closure)
const
{
return idx?
_for_each(type, closure, true):
true;
}