mirror of
https://github.com/matrix-construct/construct
synced 2024-11-04 21:08:57 +01:00
d9a4f06bf6
This is not a move to c++17. If the compiler happens to have support for c++17 namespace scope resolution, they have been kind enough to backport it to gnu++14. This limits our support for really old c++14 compilers, but that was limited anyway. GCC 6.1 and clang 3.6 tested.
114 lines
3.3 KiB
C++
114 lines
3.3 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_OPTS_H
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namespace ircd::db
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{
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template<class T> struct optval;
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template<class T> using optlist = std::initializer_list<optval<T>>;
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template<class T> bool has_opt(const optlist<T> &, const T &);
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template<class T> ssize_t opt_val(const optlist<T> &, const T &);
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enum class set;
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struct sopts;
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enum class get;
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struct gopts;
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}
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template<class T>
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struct ircd::db::optval
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:std::pair<T, ssize_t>
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{
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optval(const T &key, const ssize_t &val = std::numeric_limits<ssize_t>::min());
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};
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enum class ircd::db::set
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{
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FSYNC, // Uses kernel filesystem synchronization after write (slow)
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NO_JOURNAL, // Write Ahead Log (WAL) for some crash recovery
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MISSING_COLUMNS // No exception thrown when writing to a deleted column family
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};
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struct ircd::db::sopts
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:optlist<set>
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{
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template<class... list>
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sopts(list&&... l)
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:optlist<set>{std::forward<list>(l)...}
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{}
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};
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enum class ircd::db::get
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{
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PIN, // Keep iter data in memory for iter lifetime (good for lots of ++/--)
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CACHE, // Update the cache (CACHE is default for non-iterator operations)
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NO_CACHE, // Do not update the cache (NO_CACHE is default for iterators)
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NO_SNAPSHOT, // This iterator will have the latest data (tailing)
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NO_CHECKSUM, // Integrity of data will be checked unless this is specified
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READAHEAD, // Pair with a size in bytes for prefetching additional data
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NO_EMPTY, // Option for db::row to not include unassigned cells in the row
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};
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struct ircd::db::gopts
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:optlist<get>
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{
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database::snapshot snapshot;
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template<class... list>
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gopts(list&&... l)
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:optlist<get>{std::forward<list>(l)...}
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{}
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};
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template<class T>
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ssize_t
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ircd::db::opt_val(const optlist<T> &list,
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const T &opt)
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{
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for(const auto &p : list)
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if(p.first == opt)
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return p.second;
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return std::numeric_limits<ssize_t>::min();
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}
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template<class T>
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bool
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ircd::db::has_opt(const optlist<T> &list,
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const T &opt)
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{
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for(const auto &p : list)
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if(p.first == opt)
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return true;
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return false;
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}
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template<class T>
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ircd::db::optval<T>::optval(const T &key,
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const ssize_t &val)
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:std::pair<T, ssize_t>{key, val}
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{
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}
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