mirror of
https://github.com/matrix-construct/construct
synced 2024-12-26 15:33:54 +01:00
146 lines
4 KiB
C++
146 lines
4 KiB
C++
// The Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2020 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_DB_COLUMN_ITERATOR_H
|
|
|
|
namespace ircd::db
|
|
{
|
|
bool operator==(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
|
|
bool operator!=(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
|
|
bool operator<(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
|
|
bool operator>(const column::const_iterator_base &, const column::const_iterator_base &) noexcept;
|
|
}
|
|
|
|
/// Iteration over all keys down a column. Default construction is an invalid
|
|
/// iterator, which could be compared against in the style of STL algorithms.
|
|
/// Otherwise, construct an iterator by having it returned from the appropriate
|
|
/// function in column::.
|
|
///
|
|
struct ircd::db::column::const_iterator_base
|
|
{
|
|
using key_type = string_view;
|
|
using mapped_type = string_view;
|
|
using value_type = std::pair<key_type, mapped_type>;
|
|
using pointer = value_type *;
|
|
using reference = value_type &;
|
|
using iterator_category = std::bidirectional_iterator_tag;
|
|
using difference_type = size_t;
|
|
|
|
protected:
|
|
database::column *c;
|
|
gopts opts;
|
|
std::unique_ptr<rocksdb::Iterator> it;
|
|
mutable value_type val;
|
|
|
|
const_iterator_base(database::column *const &, std::unique_ptr<rocksdb::Iterator> &&, db::gopts = {}) noexcept;
|
|
|
|
public:
|
|
explicit operator const database::column &() const;
|
|
explicit operator const database::snapshot &() const;
|
|
explicit operator const gopts &() const;
|
|
|
|
explicit operator database::column &();
|
|
explicit operator database::snapshot &();
|
|
explicit operator gopts &();
|
|
|
|
operator bool() const noexcept;
|
|
bool operator!() const noexcept;
|
|
|
|
const value_type *operator->() const;
|
|
const value_type &operator*() const;
|
|
|
|
const_iterator_base() noexcept;
|
|
const_iterator_base(const_iterator_base &&) noexcept;
|
|
const_iterator_base &operator=(const_iterator_base &&) noexcept;
|
|
~const_iterator_base() noexcept;
|
|
|
|
friend bool operator==(const const_iterator_base &, const const_iterator_base &) noexcept;
|
|
friend bool operator!=(const const_iterator_base &, const const_iterator_base &) noexcept;
|
|
friend bool operator<(const const_iterator_base &, const const_iterator_base &) noexcept;
|
|
friend bool operator>(const const_iterator_base &, const const_iterator_base &) noexcept;
|
|
|
|
template<class pos> friend bool seek(column::const_iterator_base &, const pos &);
|
|
};
|
|
|
|
struct ircd::db::column::const_iterator
|
|
:const_iterator_base
|
|
{
|
|
friend class column;
|
|
|
|
const_iterator &operator++();
|
|
const_iterator &operator--();
|
|
|
|
using const_iterator_base::const_iterator_base;
|
|
};
|
|
|
|
struct ircd::db::column::const_reverse_iterator
|
|
:const_iterator_base
|
|
{
|
|
friend class column;
|
|
|
|
const_reverse_iterator &operator++();
|
|
const_reverse_iterator &operator--();
|
|
|
|
using const_iterator_base::const_iterator_base;
|
|
};
|
|
|
|
inline const ircd::db::column::const_iterator_base::value_type *
|
|
ircd::db::column::const_iterator_base::operator->()
|
|
const
|
|
{
|
|
return &operator*();
|
|
}
|
|
|
|
inline bool
|
|
ircd::db::column::const_iterator_base::operator!()
|
|
const noexcept
|
|
{
|
|
return !static_cast<bool>(*this);
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
gopts &()
|
|
{
|
|
return opts;
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
database::snapshot &()
|
|
{
|
|
return opts.snapshot;
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
database::column &()
|
|
{
|
|
return *c;
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
const gopts &()
|
|
const
|
|
{
|
|
return opts;
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
const database::snapshot &()
|
|
const
|
|
{
|
|
return opts.snapshot;
|
|
}
|
|
|
|
inline ircd::db::column::const_iterator_base::operator
|
|
const database::column &()
|
|
const
|
|
{
|
|
return *c;
|
|
}
|