mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 18:14:46 +02:00
84 lines
2.9 KiB
C++
84 lines
2.9 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_CONST_ITERATOR_H
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namespace ircd {
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namespace db {
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struct column::const_iterator
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{
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struct state;
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using key_type = string_view;
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using mapped_type = string_view;
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using value_type = std::pair<key_type, mapped_type>;
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using pointer = value_type *;
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using reference = value_type &;
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using difference_type = size_t;
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using iterator_category = std::bidirectional_iterator_tag;
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private:
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gopts opts;
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database::column *c;
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std::unique_ptr<rocksdb::Iterator> it;
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mutable value_type val;
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friend class column;
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const_iterator(database::column &, std::unique_ptr<rocksdb::Iterator> &&, gopts = {});
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public:
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operator const database::column &() const { return *c; }
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operator const database::snapshot &() const { return opts.snapshot; }
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explicit operator const gopts &() const { return opts; }
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operator database::column &() { return *c; }
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explicit operator database::snapshot &() { return opts.snapshot; }
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operator bool() const;
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bool operator!() const;
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bool operator<(const const_iterator &) const;
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bool operator>(const const_iterator &) const;
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bool operator==(const const_iterator &) const;
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bool operator!=(const const_iterator &) const;
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bool operator<=(const const_iterator &) const;
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bool operator>=(const const_iterator &) const;
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const value_type *operator->() const;
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const value_type &operator*() const;
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const_iterator &operator++();
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const_iterator &operator--();
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const_iterator();
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const_iterator(const_iterator &&) noexcept;
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const_iterator &operator=(const_iterator &&) noexcept;
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~const_iterator() noexcept;
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template<class pos> friend void seek(column::const_iterator &, const pos &);
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friend void seek(column::const_iterator &, const string_view &key);
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};
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} // namespace db
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} // namespace ircd
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