mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 06:51:08 +01:00
153 lines
4.1 KiB
C++
153 lines
4.1 KiB
C++
// The Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_DB_COLUMN_ITERATOR_H
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namespace ircd::db
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{
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bool operator==(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
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bool operator!=(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
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bool operator<(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
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bool operator>(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
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}
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/// Iteration over all keys down a column. Default construction is an invalid
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/// iterator, which could be compared against in the style of STL algorithms.
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/// Otherwise, construct an iterator by having it returned from the appropriate
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/// function in column::.
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///
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struct ircd::db::column::const_iterator_base
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{
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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 iterator_category = std::bidirectional_iterator_tag;
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using difference_type = size_t;
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protected:
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database::column *c;
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gopts opts;
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std::unique_ptr<rocksdb::Iterator> it;
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mutable value_type val;
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const_iterator_base(database::column *const &, std::unique_ptr<rocksdb::Iterator> &&, db::gopts = {}) noexcept;
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public:
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explicit operator const database::column &() const;
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explicit operator const database::snapshot &() const;
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explicit operator const gopts &() const;
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explicit operator database::column &();
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explicit operator database::snapshot &();
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explicit operator gopts &();
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operator bool() const;
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bool operator!() 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_base() noexcept;
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const_iterator_base(const_iterator_base &&) noexcept;
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const_iterator_base &operator=(const_iterator_base &&) noexcept;
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~const_iterator_base() noexcept;
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friend bool operator==(const const_iterator_base &, const const_iterator_base &) noexcept;
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friend bool operator!=(const const_iterator_base &, const const_iterator_base &) noexcept;
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friend bool operator<(const const_iterator_base &, const const_iterator_base &) noexcept;
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friend bool operator>(const const_iterator_base &, const const_iterator_base &) noexcept;
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template<class pos> friend bool seek(column::const_iterator_base &, const pos &);
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};
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struct ircd::db::column::const_iterator
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:const_iterator_base
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{
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friend class column;
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const_iterator &operator++();
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const_iterator &operator--();
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using const_iterator_base::const_iterator_base;
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};
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struct ircd::db::column::const_reverse_iterator
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:const_iterator_base
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{
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friend class column;
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const_reverse_iterator &operator++();
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const_reverse_iterator &operator--();
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using const_iterator_base::const_iterator_base;
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};
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inline const ircd::db::column::const_iterator_base::value_type *
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ircd::db::column::const_iterator_base::operator->()
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const
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{
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return &operator*();
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}
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inline bool
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ircd::db::column::const_iterator_base::operator!()
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const
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{
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return !static_cast<bool>(*this);
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}
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inline ircd::db::column::const_iterator_base::operator
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bool()
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const
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{
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return it && valid(*it);
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}
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inline ircd::db::column::const_iterator_base::operator
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gopts &()
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{
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return opts;
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}
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inline ircd::db::column::const_iterator_base::operator
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database::snapshot &()
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{
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return opts.snapshot;
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}
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inline ircd::db::column::const_iterator_base::operator
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database::column &()
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{
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return *c;
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}
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inline ircd::db::column::const_iterator_base::operator
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const gopts &()
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const
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{
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return opts;
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}
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inline ircd::db::column::const_iterator_base::operator
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const database::snapshot &()
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const
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{
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return opts.snapshot;
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}
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inline ircd::db::column::const_iterator_base::operator
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const database::column &()
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const
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{
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return *c;
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}
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