420 lines
11 KiB
C++
420 lines
11 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include <deque>
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namespace base {
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template <typename Type>
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class flat_set;
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template <typename Type>
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class flat_multi_set;
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template <typename Type, typename iterator_impl>
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class flat_multi_set_iterator_base_impl;
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template <typename Type, typename iterator_impl>
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class flat_multi_set_iterator_base_impl {
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public:
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using iterator_category = typename iterator_impl::iterator_category;
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using value_type = typename flat_multi_set<Type>::value_type;
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using difference_type = typename iterator_impl::difference_type;
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using pointer = typename flat_multi_set<Type>::pointer;
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using reference = typename flat_multi_set<Type>::reference;
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flat_multi_set_iterator_base_impl(iterator_impl impl = iterator_impl()) : _impl(impl) {
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}
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reference operator*() const {
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return *_impl;
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}
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pointer operator->() const {
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return std::addressof(**this);
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}
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flat_multi_set_iterator_base_impl &operator++() {
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++_impl;
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return *this;
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}
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flat_multi_set_iterator_base_impl operator++(int) {
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return _impl++;
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}
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flat_multi_set_iterator_base_impl &operator--() {
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--_impl;
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return *this;
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}
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flat_multi_set_iterator_base_impl operator--(int) {
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return _impl--;
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}
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flat_multi_set_iterator_base_impl &operator+=(difference_type offset) {
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_impl += offset;
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return *this;
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}
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flat_multi_set_iterator_base_impl operator+(difference_type offset) const {
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return _impl + offset;
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}
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flat_multi_set_iterator_base_impl &operator-=(difference_type offset) {
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_impl -= offset;
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return *this;
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}
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flat_multi_set_iterator_base_impl operator-(difference_type offset) const {
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return _impl - offset;
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}
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difference_type operator-(const flat_multi_set_iterator_base_impl &right) const {
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return _impl - right._impl;
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}
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reference operator[](difference_type offset) const {
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return _impl[offset];
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}
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bool operator==(const flat_multi_set_iterator_base_impl &right) const {
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return _impl == right._impl;
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}
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bool operator!=(const flat_multi_set_iterator_base_impl &right) const {
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return _impl != right._impl;
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}
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bool operator<(const flat_multi_set_iterator_base_impl &right) const {
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return _impl < right._impl;
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}
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private:
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iterator_impl _impl;
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friend class flat_multi_set<Type>;
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};
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template <typename Type>
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class flat_multi_set {
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using self = flat_multi_set<Type>;
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class const_wrap {
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public:
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const_wrap(const Type &value) : _value(value) {
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}
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const_wrap(Type &&value) : _value(std::move(value)) {
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}
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inline operator const Type&() const {
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return _value;
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}
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friend inline bool operator<(const Type &a, const const_wrap &b) {
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return a < ((const Type&)b);
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}
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friend inline bool operator<(const const_wrap &a, const Type &b) {
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return ((const Type&)a) < b;
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}
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friend inline bool operator<(const const_wrap &a, const const_wrap &b) {
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return ((const Type&)a) < ((const Type&)b);
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}
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private:
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Type _value;
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};
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using impl = std::deque<const_wrap>;
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using iterator_base = flat_multi_set_iterator_base_impl<Type, typename impl::iterator>;
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using const_iterator_base = flat_multi_set_iterator_base_impl<Type, typename impl::const_iterator>;
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using reverse_iterator_base = flat_multi_set_iterator_base_impl<Type, typename impl::reverse_iterator>;
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using const_reverse_iterator_base = flat_multi_set_iterator_base_impl<Type, typename impl::const_reverse_iterator>;
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public:
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using value_type = Type;
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using size_type = typename impl::size_type;
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using difference_type = typename impl::difference_type;
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using pointer = const Type*;
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using reference = const Type&;
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class const_iterator;
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class iterator : public iterator_base {
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public:
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using iterator_base::iterator_base;
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iterator(const iterator_base &other) : iterator_base(other) {
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}
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friend class const_iterator;
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};
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class const_iterator : public const_iterator_base {
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public:
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using const_iterator_base::const_iterator_base;
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const_iterator(const_iterator_base other) : const_iterator_base(other) {
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}
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const_iterator(const iterator &other) : const_iterator_base(other._impl) {
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}
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};
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class const_reverse_iterator;
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class reverse_iterator : public reverse_iterator_base {
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public:
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using reverse_iterator_base::reverse_iterator_base;
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reverse_iterator(reverse_iterator_base other) : reverse_iterator_base(other) {
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}
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friend class const_reverse_iterator;
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};
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class const_reverse_iterator : public const_reverse_iterator_base {
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public:
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using const_reverse_iterator_base::const_reverse_iterator_base;
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const_reverse_iterator(const_reverse_iterator_base other) : const_reverse_iterator_base(other) {
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}
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const_reverse_iterator(const reverse_iterator &other) : const_reverse_iterator_base(other._impl) {
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}
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};
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flat_multi_set() = default;
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template <typename Iterator, typename = typename std::iterator_traits<Iterator>::iterator_category>
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flat_multi_set(Iterator first, Iterator last) : _impl(first, last) {
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std::sort(_impl.begin(), _impl.end());
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}
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size_type size() const {
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return _impl.size();
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}
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bool empty() const {
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return _impl.empty();
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}
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void clear() {
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_impl.clear();
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}
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iterator begin() {
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return _impl.begin();
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}
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iterator end() {
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return _impl.end();
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}
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const_iterator begin() const {
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return _impl.begin();
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}
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const_iterator end() const {
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return _impl.end();
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}
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const_iterator cbegin() const {
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return _impl.cbegin();
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}
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const_iterator cend() const {
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return _impl.cend();
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}
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reverse_iterator rbegin() {
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return _impl.rbegin();
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}
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reverse_iterator rend() {
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return _impl.rend();
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}
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const_reverse_iterator rbegin() const {
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return _impl.rbegin();
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}
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const_reverse_iterator rend() const {
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return _impl.rend();
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}
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const_reverse_iterator crbegin() const {
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return _impl.crbegin();
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}
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const_reverse_iterator crend() const {
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return _impl.crend();
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}
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reference front() const {
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return *begin();
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}
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reference back() const {
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return *(end() - 1);
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}
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iterator insert(const Type &value) {
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if (empty() || (value < front())) {
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_impl.push_front(value);
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return begin();
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} else if (!(value < back())) {
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_impl.push_back(value);
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return (end() - 1);
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}
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auto where = getUpperBound(value);
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return _impl.insert(where, value);
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}
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iterator insert(Type &&value) {
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if (empty() || (value < front())) {
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_impl.push_front(std::move(value));
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return begin();
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} else if (!(value < back())) {
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_impl.push_back(std::move(value));
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return (end() - 1);
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}
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auto where = getUpperBound(value);
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return _impl.insert(where, std::move(value));
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}
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template <typename... Args>
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iterator emplace(Args&&... args) {
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return insert(Type(std::forward<Args>(args)...));
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}
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bool removeOne(const Type &value) {
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if (empty() || (value < front()) || (back() < value)) {
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return false;
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}
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auto where = getLowerBound(value);
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if (value < *where) {
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return false;
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}
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_impl.erase(where);
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return true;
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}
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int removeAll(const Type &value) {
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if (empty() || (value < front()) || (back() < value)) {
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return 0;
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}
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auto range = getEqualRange(value);
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if (range.first == range.second) {
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return 0;
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}
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_impl.erase(range.first, range.second);
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return (range.second - range.first);
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}
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iterator erase(iterator where) {
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return _impl.erase(where._impl);
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}
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iterator erase(iterator from, iterator till) {
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return _impl.erase(from._impl, till._impl);
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}
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iterator findFirst(const Type &value) {
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if (empty() || (value < front()) || (back() < value)) {
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return end();
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}
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auto where = getLowerBound(value);
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return (value < *where) ? _impl.end() : where;
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}
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const_iterator findFirst(const Type &value) const {
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if (empty() || (value < front()) || (back() < value)) {
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return end();
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}
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auto where = getLowerBound(value);
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return (value < *where) ? _impl.end() : where;
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}
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bool contains(const Type &value) const {
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return findFirst(value) != end();
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}
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int count(const Type &value) const {
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if (empty() || (value < front()) || (back() < value)) {
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return 0;
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}
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auto range = getEqualRange(value);
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return (range.second - range.first);
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}
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private:
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impl _impl;
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friend class flat_set<Type>;
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typename impl::iterator getLowerBound(const Type &value) {
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return std::lower_bound(_impl.begin(), _impl.end(), value);
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}
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typename impl::const_iterator getLowerBound(const Type &value) const {
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return std::lower_bound(_impl.begin(), _impl.end(), value);
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}
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typename impl::iterator getUpperBound(const Type &value) {
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return std::upper_bound(_impl.begin(), _impl.end(), value);
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}
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typename impl::const_iterator getUpperBound(const Type &value) const {
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return std::upper_bound(_impl.begin(), _impl.end(), value);
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}
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std::pair<typename impl::iterator, typename impl::iterator> getEqualRange(const Type &value) {
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return std::equal_range(_impl.begin(), _impl.end(), value);
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}
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std::pair<typename impl::const_iterator, typename impl::const_iterator> getEqualRange(const Type &value) const {
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return std::equal_range(_impl.begin(), _impl.end(), value);
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}
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};
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template <typename Type>
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class flat_set : public flat_multi_set<Type> {
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using parent = flat_multi_set<Type>;
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public:
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using parent::parent;
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using iterator = typename parent::iterator;
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using const_iterator = typename parent::const_iterator;
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flat_set() = default;
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template <typename Iterator, typename = typename std::iterator_traits<Iterator>::iterator_category>
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flat_set(Iterator first, Iterator last) : parent(first, last) {
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this->_impl.erase(std::unique(this->_impl.begin(), this->_impl.end(), [](auto &&a, auto &&b) {
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return !(a < b);
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}), this->_impl.end());
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}
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iterator insert(const Type &value) {
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if (this->empty() || (value < this->front())) {
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this->_impl.push_front(value);
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return this->begin();
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} else if (this->back() < value) {
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this->_impl.push_back(value);
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return (this->end() - 1);
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}
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auto where = this->getLowerBound(value);
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if (value < *where) {
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return this->_impl.insert(where, value);
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}
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return this->end();
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}
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iterator insert(Type &&value) {
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if (this->empty() || (value < this->front())) {
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this->_impl.push_front(std::move(value));
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return this->begin();
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} else if (this->back() < value) {
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this->_impl.push_back(std::move(value));
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return (this->end() - 1);
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}
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auto where = this->getLowerBound(value);
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if (value < *where) {
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return this->_impl.insert(where, std::move(value));
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}
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return this->end();
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}
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template <typename... Args>
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iterator emplace(Args&&... args) {
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return this->insert(Type(std::forward<Args>(args)...));
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}
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bool remove(const Type &value) {
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return this->removeOne(value);
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}
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iterator find(const Type &value) {
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return this->findFirst(value);
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}
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const_iterator find(const Type &value) const {
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return this->findFirst(value);
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}
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};
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} // namespace base
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