955d5affa8
Random-access access to `List` when iterating is `O(n^2)` (`O(n)` when accessing a single element) * Removed subscript operator, in favor of a more explicit `get` * Added conversion from `Iterator` to `ConstIterator` * Remade existing operations into other solutions when applicable
812 lines
17 KiB
C++
812 lines
17 KiB
C++
/**************************************************************************/
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/* list.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef LIST_H
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#define LIST_H
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#include "core/error/error_macros.h"
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#include "core/os/memory.h"
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#include "core/templates/sort_array.h"
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/**
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* Generic Templatized Linked List Implementation.
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* The implementation differs from the STL one because
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* a compatible preallocated linked list can be written
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* using the same API, or features such as erasing an element
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* from the iterator.
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*/
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template <typename T, typename A = DefaultAllocator>
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class List {
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struct _Data;
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public:
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class Element {
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private:
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friend class List<T, A>;
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T value;
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Element *next_ptr = nullptr;
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Element *prev_ptr = nullptr;
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_Data *data = nullptr;
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public:
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/**
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* Get NEXT Element iterator, for constant lists.
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*/
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_FORCE_INLINE_ const Element *next() const {
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return next_ptr;
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}
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/**
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* Get NEXT Element iterator,
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*/
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_FORCE_INLINE_ Element *next() {
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return next_ptr;
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}
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/**
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* Get PREV Element iterator, for constant lists.
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*/
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_FORCE_INLINE_ const Element *prev() const {
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return prev_ptr;
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}
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/**
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* Get PREV Element iterator,
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*/
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_FORCE_INLINE_ Element *prev() {
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return prev_ptr;
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}
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/**
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* * operator, for using as *iterator, when iterators are defined on stack.
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*/
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_FORCE_INLINE_ const T &operator*() const {
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return value;
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}
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/**
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* operator->, for using as iterator->, when iterators are defined on stack, for constant lists.
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*/
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_FORCE_INLINE_ const T *operator->() const {
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return &value;
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}
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/**
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* * operator, for using as *iterator, when iterators are defined on stack,
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*/
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_FORCE_INLINE_ T &operator*() {
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return value;
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}
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/**
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* operator->, for using as iterator->, when iterators are defined on stack, for constant lists.
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*/
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_FORCE_INLINE_ T *operator->() {
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return &value;
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}
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/**
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* get the value stored in this element.
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*/
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_FORCE_INLINE_ T &get() {
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return value;
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}
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/**
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* get the value stored in this element, for constant lists
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*/
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_FORCE_INLINE_ const T &get() const {
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return value;
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}
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/**
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* set the value stored in this element.
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*/
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_FORCE_INLINE_ void set(const T &p_value) {
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value = (T &)p_value;
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}
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void erase() {
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data->erase(this);
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}
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void transfer_to_back(List<T, A> *p_dst_list);
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_FORCE_INLINE_ Element() {}
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};
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typedef T ValueType;
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struct ConstIterator {
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_FORCE_INLINE_ const T &operator*() const {
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return E->get();
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}
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_FORCE_INLINE_ const T *operator->() const { return &E->get(); }
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_FORCE_INLINE_ ConstIterator &operator++() {
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E = E->next();
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return *this;
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}
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_FORCE_INLINE_ ConstIterator &operator--() {
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E = E->prev();
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return *this;
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}
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_FORCE_INLINE_ bool operator==(const ConstIterator &b) const { return E == b.E; }
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_FORCE_INLINE_ bool operator!=(const ConstIterator &b) const { return E != b.E; }
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_FORCE_INLINE_ ConstIterator(const Element *p_E) { E = p_E; }
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_FORCE_INLINE_ ConstIterator() {}
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_FORCE_INLINE_ ConstIterator(const ConstIterator &p_it) { E = p_it.E; }
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private:
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const Element *E = nullptr;
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};
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struct Iterator {
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_FORCE_INLINE_ T &operator*() const {
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return E->get();
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}
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_FORCE_INLINE_ T *operator->() const { return &E->get(); }
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_FORCE_INLINE_ Iterator &operator++() {
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E = E->next();
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return *this;
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}
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_FORCE_INLINE_ Iterator &operator--() {
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E = E->prev();
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return *this;
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}
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_FORCE_INLINE_ bool operator==(const Iterator &b) const { return E == b.E; }
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_FORCE_INLINE_ bool operator!=(const Iterator &b) const { return E != b.E; }
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Iterator(Element *p_E) { E = p_E; }
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Iterator() {}
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Iterator(const Iterator &p_it) { E = p_it.E; }
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operator ConstIterator() const {
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return ConstIterator(E);
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}
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private:
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Element *E = nullptr;
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};
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_FORCE_INLINE_ Iterator begin() {
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return Iterator(front());
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}
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_FORCE_INLINE_ Iterator end() {
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return Iterator(nullptr);
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}
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#if 0
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//to use when replacing find()
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_FORCE_INLINE_ Iterator find(const K &p_key) {
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return Iterator(find(p_key));
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}
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#endif
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_FORCE_INLINE_ ConstIterator begin() const {
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return ConstIterator(front());
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}
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_FORCE_INLINE_ ConstIterator end() const {
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return ConstIterator(nullptr);
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}
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#if 0
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//to use when replacing find()
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_FORCE_INLINE_ ConstIterator find(const K &p_key) const {
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return ConstIterator(find(p_key));
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}
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#endif
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private:
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struct _Data {
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Element *first = nullptr;
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Element *last = nullptr;
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int size_cache = 0;
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bool erase(const Element *p_I) {
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ERR_FAIL_NULL_V(p_I, false);
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ERR_FAIL_COND_V(p_I->data != this, false);
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if (first == p_I) {
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first = p_I->next_ptr;
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}
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if (last == p_I) {
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last = p_I->prev_ptr;
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}
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if (p_I->prev_ptr) {
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p_I->prev_ptr->next_ptr = p_I->next_ptr;
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}
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if (p_I->next_ptr) {
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p_I->next_ptr->prev_ptr = p_I->prev_ptr;
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}
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memdelete_allocator<Element, A>(const_cast<Element *>(p_I));
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size_cache--;
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return true;
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}
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};
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_Data *_data = nullptr;
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public:
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/**
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* return a const iterator to the beginning of the list.
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*/
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_FORCE_INLINE_ const Element *front() const {
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return _data ? _data->first : nullptr;
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}
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/**
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* return an iterator to the beginning of the list.
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*/
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_FORCE_INLINE_ Element *front() {
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return _data ? _data->first : nullptr;
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}
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/**
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* return a const iterator to the last member of the list.
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*/
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_FORCE_INLINE_ const Element *back() const {
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return _data ? _data->last : nullptr;
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}
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/**
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* return an iterator to the last member of the list.
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*/
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_FORCE_INLINE_ Element *back() {
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return _data ? _data->last : nullptr;
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}
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/**
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* store a new element at the end of the list
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*/
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Element *push_back(const T &value) {
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if (!_data) {
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_data = memnew_allocator(_Data, A);
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_data->first = nullptr;
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_data->last = nullptr;
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_data->size_cache = 0;
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}
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Element *n = memnew_allocator(Element, A);
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n->value = (T &)value;
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n->prev_ptr = _data->last;
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n->next_ptr = nullptr;
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n->data = _data;
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if (_data->last) {
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_data->last->next_ptr = n;
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}
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_data->last = n;
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if (!_data->first) {
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_data->first = n;
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}
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_data->size_cache++;
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return n;
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}
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void pop_back() {
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if (_data && _data->last) {
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erase(_data->last);
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}
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}
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/**
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* store a new element at the beginning of the list
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*/
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Element *push_front(const T &value) {
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if (!_data) {
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_data = memnew_allocator(_Data, A);
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_data->first = nullptr;
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_data->last = nullptr;
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_data->size_cache = 0;
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}
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Element *n = memnew_allocator(Element, A);
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n->value = (T &)value;
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n->prev_ptr = nullptr;
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n->next_ptr = _data->first;
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n->data = _data;
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if (_data->first) {
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_data->first->prev_ptr = n;
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}
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_data->first = n;
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if (!_data->last) {
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_data->last = n;
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}
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_data->size_cache++;
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return n;
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}
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void pop_front() {
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if (_data && _data->first) {
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erase(_data->first);
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}
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}
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Element *insert_after(Element *p_element, const T &p_value) {
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CRASH_COND(p_element && (!_data || p_element->data != _data));
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if (!p_element) {
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return push_back(p_value);
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}
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Element *n = memnew_allocator(Element, A);
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n->value = (T &)p_value;
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n->prev_ptr = p_element;
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n->next_ptr = p_element->next_ptr;
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n->data = _data;
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if (!p_element->next_ptr) {
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_data->last = n;
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} else {
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p_element->next_ptr->prev_ptr = n;
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}
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p_element->next_ptr = n;
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_data->size_cache++;
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return n;
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}
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Element *insert_before(Element *p_element, const T &p_value) {
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CRASH_COND(p_element && (!_data || p_element->data != _data));
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if (!p_element) {
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return push_back(p_value);
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}
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Element *n = memnew_allocator(Element, A);
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n->value = (T &)p_value;
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n->prev_ptr = p_element->prev_ptr;
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n->next_ptr = p_element;
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n->data = _data;
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if (!p_element->prev_ptr) {
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_data->first = n;
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} else {
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p_element->prev_ptr->next_ptr = n;
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}
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p_element->prev_ptr = n;
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_data->size_cache++;
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return n;
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}
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/**
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* find an element in the list,
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*/
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template <typename T_v>
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Element *find(const T_v &p_val) {
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Element *it = front();
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while (it) {
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if (it->value == p_val) {
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return it;
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}
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it = it->next();
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}
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return nullptr;
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}
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/**
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* erase an element in the list, by iterator pointing to it. Return true if it was found/erased.
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*/
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bool erase(const Element *p_I) {
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if (_data && p_I) {
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bool ret = _data->erase(p_I);
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if (_data->size_cache == 0) {
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memdelete_allocator<_Data, A>(_data);
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_data = nullptr;
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}
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return ret;
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}
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return false;
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}
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/**
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* erase the first element in the list, that contains value
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*/
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bool erase(const T &value) {
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Element *I = find(value);
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return erase(I);
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}
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/**
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* return whether the list is empty
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*/
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_FORCE_INLINE_ bool is_empty() const {
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return (!_data || !_data->size_cache);
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}
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/**
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* clear the list
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*/
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void clear() {
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while (front()) {
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erase(front());
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}
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}
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_FORCE_INLINE_ int size() const {
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return _data ? _data->size_cache : 0;
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}
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void swap(Element *p_A, Element *p_B) {
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ERR_FAIL_COND(!p_A || !p_B);
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ERR_FAIL_COND(p_A->data != _data);
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ERR_FAIL_COND(p_B->data != _data);
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if (p_A == p_B) {
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return;
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}
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Element *A_prev = p_A->prev_ptr;
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Element *A_next = p_A->next_ptr;
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Element *B_prev = p_B->prev_ptr;
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Element *B_next = p_B->next_ptr;
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if (A_prev) {
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A_prev->next_ptr = p_B;
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} else {
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_data->first = p_B;
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}
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if (B_prev) {
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B_prev->next_ptr = p_A;
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} else {
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_data->first = p_A;
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}
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if (A_next) {
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A_next->prev_ptr = p_B;
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} else {
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_data->last = p_B;
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}
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if (B_next) {
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B_next->prev_ptr = p_A;
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} else {
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_data->last = p_A;
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}
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p_A->prev_ptr = A_next == p_B ? p_B : B_prev;
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p_A->next_ptr = B_next == p_A ? p_B : B_next;
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p_B->prev_ptr = B_next == p_A ? p_A : A_prev;
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p_B->next_ptr = A_next == p_B ? p_A : A_next;
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}
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/**
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* copy the list
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*/
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void operator=(const List &p_list) {
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clear();
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const Element *it = p_list.front();
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while (it) {
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push_back(it->get());
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it = it->next();
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}
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}
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// Random access to elements, use with care,
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// do not use for iteration.
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T &get(int p_index) {
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CRASH_BAD_INDEX(p_index, size());
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Element *I = front();
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int c = 0;
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while (c < p_index) {
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I = I->next();
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c++;
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}
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return I->get();
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}
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// Random access to elements, use with care,
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// do not use for iteration.
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const T &get(int p_index) const {
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CRASH_BAD_INDEX(p_index, size());
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const Element *I = front();
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int c = 0;
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while (c < p_index) {
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I = I->next();
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c++;
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}
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return I->get();
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}
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void move_to_back(Element *p_I) {
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ERR_FAIL_COND(p_I->data != _data);
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if (!p_I->next_ptr) {
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return;
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}
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if (_data->first == p_I) {
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_data->first = p_I->next_ptr;
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}
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if (_data->last == p_I) {
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_data->last = p_I->prev_ptr;
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}
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if (p_I->prev_ptr) {
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p_I->prev_ptr->next_ptr = p_I->next_ptr;
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}
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p_I->next_ptr->prev_ptr = p_I->prev_ptr;
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_data->last->next_ptr = p_I;
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p_I->prev_ptr = _data->last;
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p_I->next_ptr = nullptr;
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_data->last = p_I;
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}
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|
|
void reverse() {
|
|
int s = size() / 2;
|
|
Element *F = front();
|
|
Element *B = back();
|
|
for (int i = 0; i < s; i++) {
|
|
SWAP(F->value, B->value);
|
|
F = F->next();
|
|
B = B->prev();
|
|
}
|
|
}
|
|
|
|
void move_to_front(Element *p_I) {
|
|
ERR_FAIL_COND(p_I->data != _data);
|
|
if (!p_I->prev_ptr) {
|
|
return;
|
|
}
|
|
|
|
if (_data->first == p_I) {
|
|
_data->first = p_I->next_ptr;
|
|
}
|
|
|
|
if (_data->last == p_I) {
|
|
_data->last = p_I->prev_ptr;
|
|
}
|
|
|
|
p_I->prev_ptr->next_ptr = p_I->next_ptr;
|
|
|
|
if (p_I->next_ptr) {
|
|
p_I->next_ptr->prev_ptr = p_I->prev_ptr;
|
|
}
|
|
|
|
_data->first->prev_ptr = p_I;
|
|
p_I->next_ptr = _data->first;
|
|
p_I->prev_ptr = nullptr;
|
|
_data->first = p_I;
|
|
}
|
|
|
|
void move_before(Element *value, Element *where) {
|
|
if (value->prev_ptr) {
|
|
value->prev_ptr->next_ptr = value->next_ptr;
|
|
} else {
|
|
_data->first = value->next_ptr;
|
|
}
|
|
if (value->next_ptr) {
|
|
value->next_ptr->prev_ptr = value->prev_ptr;
|
|
} else {
|
|
_data->last = value->prev_ptr;
|
|
}
|
|
|
|
value->next_ptr = where;
|
|
if (!where) {
|
|
value->prev_ptr = _data->last;
|
|
_data->last = value;
|
|
return;
|
|
}
|
|
|
|
value->prev_ptr = where->prev_ptr;
|
|
|
|
if (where->prev_ptr) {
|
|
where->prev_ptr->next_ptr = value;
|
|
} else {
|
|
_data->first = value;
|
|
}
|
|
|
|
where->prev_ptr = value;
|
|
}
|
|
|
|
/**
|
|
* simple insertion sort
|
|
*/
|
|
|
|
void sort() {
|
|
sort_custom<Comparator<T>>();
|
|
}
|
|
|
|
template <typename C>
|
|
void sort_custom_inplace() {
|
|
if (size() < 2) {
|
|
return;
|
|
}
|
|
|
|
Element *from = front();
|
|
Element *current = from;
|
|
Element *to = from;
|
|
|
|
while (current) {
|
|
Element *next = current->next_ptr;
|
|
|
|
if (from != current) {
|
|
current->prev_ptr = nullptr;
|
|
current->next_ptr = from;
|
|
|
|
Element *find = from;
|
|
C less;
|
|
while (find && less(find->value, current->value)) {
|
|
current->prev_ptr = find;
|
|
current->next_ptr = find->next_ptr;
|
|
find = find->next_ptr;
|
|
}
|
|
|
|
if (current->prev_ptr) {
|
|
current->prev_ptr->next_ptr = current;
|
|
} else {
|
|
from = current;
|
|
}
|
|
|
|
if (current->next_ptr) {
|
|
current->next_ptr->prev_ptr = current;
|
|
} else {
|
|
to = current;
|
|
}
|
|
} else {
|
|
current->prev_ptr = nullptr;
|
|
current->next_ptr = nullptr;
|
|
}
|
|
|
|
current = next;
|
|
}
|
|
_data->first = from;
|
|
_data->last = to;
|
|
}
|
|
|
|
template <typename C>
|
|
struct AuxiliaryComparator {
|
|
C compare;
|
|
_FORCE_INLINE_ bool operator()(const Element *a, const Element *b) const {
|
|
return compare(a->value, b->value);
|
|
}
|
|
};
|
|
|
|
template <typename C>
|
|
void sort_custom() {
|
|
//this version uses auxiliary memory for speed.
|
|
//if you don't want to use auxiliary memory, use the in_place version
|
|
|
|
int s = size();
|
|
if (s < 2) {
|
|
return;
|
|
}
|
|
|
|
Element **aux_buffer = memnew_arr(Element *, s);
|
|
|
|
int idx = 0;
|
|
for (Element *E = front(); E; E = E->next_ptr) {
|
|
aux_buffer[idx] = E;
|
|
idx++;
|
|
}
|
|
|
|
SortArray<Element *, AuxiliaryComparator<C>> sort;
|
|
sort.sort(aux_buffer, s);
|
|
|
|
_data->first = aux_buffer[0];
|
|
aux_buffer[0]->prev_ptr = nullptr;
|
|
aux_buffer[0]->next_ptr = aux_buffer[1];
|
|
|
|
_data->last = aux_buffer[s - 1];
|
|
aux_buffer[s - 1]->prev_ptr = aux_buffer[s - 2];
|
|
aux_buffer[s - 1]->next_ptr = nullptr;
|
|
|
|
for (int i = 1; i < s - 1; i++) {
|
|
aux_buffer[i]->prev_ptr = aux_buffer[i - 1];
|
|
aux_buffer[i]->next_ptr = aux_buffer[i + 1];
|
|
}
|
|
|
|
memdelete_arr(aux_buffer);
|
|
}
|
|
|
|
const void *id() const {
|
|
return (void *)_data;
|
|
}
|
|
|
|
/**
|
|
* copy constructor for the list
|
|
*/
|
|
List(const List &p_list) {
|
|
const Element *it = p_list.front();
|
|
while (it) {
|
|
push_back(it->get());
|
|
it = it->next();
|
|
}
|
|
}
|
|
|
|
List() {}
|
|
|
|
~List() {
|
|
clear();
|
|
if (_data) {
|
|
ERR_FAIL_COND(_data->size_cache);
|
|
memdelete_allocator<_Data, A>(_data);
|
|
}
|
|
}
|
|
};
|
|
|
|
template <typename T, typename A>
|
|
void List<T, A>::Element::transfer_to_back(List<T, A> *p_dst_list) {
|
|
// Detach from current.
|
|
|
|
if (data->first == this) {
|
|
data->first = data->first->next_ptr;
|
|
}
|
|
if (data->last == this) {
|
|
data->last = data->last->prev_ptr;
|
|
}
|
|
if (prev_ptr) {
|
|
prev_ptr->next_ptr = next_ptr;
|
|
}
|
|
if (next_ptr) {
|
|
next_ptr->prev_ptr = prev_ptr;
|
|
}
|
|
data->size_cache--;
|
|
|
|
// Attach to the back of the new one.
|
|
|
|
if (!p_dst_list->_data) {
|
|
p_dst_list->_data = memnew_allocator(_Data, A);
|
|
p_dst_list->_data->first = this;
|
|
p_dst_list->_data->last = nullptr;
|
|
p_dst_list->_data->size_cache = 0;
|
|
prev_ptr = nullptr;
|
|
} else {
|
|
p_dst_list->_data->last->next_ptr = this;
|
|
prev_ptr = p_dst_list->_data->last;
|
|
}
|
|
p_dst_list->_data->last = this;
|
|
next_ptr = nullptr;
|
|
|
|
data = p_dst_list->_data;
|
|
p_dst_list->_data->size_cache++;
|
|
}
|
|
|
|
#endif // LIST_H
|