mirror of
https://github.com/matrix-construct/construct
synced 2024-07-03 09:18:19 +02:00
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 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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*
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*/
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#pragma once
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#define HAVE_IRCD_DB_DELTA_H
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namespace ircd::db
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{
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struct delta;
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}
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/// Update a database cell without `cell`, `column` or row `references`.
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///
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/// The cell is found by name string. This is the least efficient of the deltas
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/// for many updates to the same column or cell when a reference to those can
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/// be pre-resolved. This delta has to resolve those references every single
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/// time it's iterated over; but that's okay for some transactions.
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///
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struct ircd::db::delta
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:std::tuple<op, string_view, string_view, string_view>
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{
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enum // for use with std::get<VAL>(delta)
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{
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OP, COL, KEY, VAL,
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};
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delta(const enum op &op,
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const string_view &col,
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const string_view &key,
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const string_view &val = {})
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:std::tuple<enum op, string_view, string_view, string_view>
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{
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op, col, key, val
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}{}
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delta(const string_view &col,
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const string_view &key,
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const string_view &val = {},
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const enum op &op = op::SET)
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:std::tuple<enum op, string_view, string_view, string_view>
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{
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op, col, key, val
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}{}
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delta() = default;
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};
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