mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 15:00:51 +01:00
100 lines
2.5 KiB
C++
100 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::closure_bool
|
|
<
|
|
std::function,
|
|
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;
|
|
}
|