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634 lines
12 KiB
C++
634 lines
12 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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/* http://www.godotengine.org */
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/*************************************************************************/
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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 GLOBALS_LIST_H
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#define GLOBALS_LIST_H
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#include "os/memory.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 <class T,class 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;
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Element* prev_ptr;
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_Data *data;
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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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_FORCE_INLINE_ Element() {
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next_ptr = 0;
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prev_ptr = 0;
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data=NULL;
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};
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};
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private:
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struct _Data {
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Element* first;
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Element* last;
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int size_cache;
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bool erase(const Element* p_I) {
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ERR_FAIL_COND_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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if (p_I->prev_ptr)
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p_I->prev_ptr->next_ptr=p_I->next_ptr;
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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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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;
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public:
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/**
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* return an const iterator to the begining 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:0;
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};
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/**
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* return an iterator to the begining of the list.
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*/
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_FORCE_INLINE_ Element* front() {
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return _data?_data->first:0;
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};
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/**
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* return an 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:0;
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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:0;
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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=NULL;
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_data->last=NULL;
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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=0;
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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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_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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* store a new element at the begining 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=NULL;
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_data->last=NULL;
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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 = 0;
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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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_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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* find an element in the list,
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*/
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template<class 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) return it;
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it = it->next();
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};
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return NULL;
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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) {
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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=NULL;
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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 wether the list is empty
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*/
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_FORCE_INLINE_ bool 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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Element* A_prev=p_A->prev_ptr;
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Element* A_next=p_A->next_ptr;
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p_A->next_ptr=p_B->next_ptr;
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p_A->prev_ptr=p_B->prev_ptr;
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p_B->next_ptr=A_next;
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p_B->prev_ptr=A_prev;
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if (p_A->prev_ptr)
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p_A->prev_ptr->next_ptr=p_A;
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if (p_A->next_ptr)
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p_A->next_ptr->prev_ptr=p_A;
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if (p_B->prev_ptr)
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p_B->prev_ptr->next_ptr=p_B;
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if (p_B->next_ptr)
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p_B->next_ptr->prev_ptr=p_B;
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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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T& operator[](int p_index) {
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if (p_index<0 || p_index>=size()) {
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T& aux=*((T*)0); //nullreturn
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ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
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}
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Element *I=front();
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int c=0;
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while(I) {
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if (c==p_index) {
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return I->get();
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}
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I=I->next();
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c++;
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}
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ERR_FAIL_V( *((T*)0) ); // bug!!
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}
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const T& operator[](int p_index) const {
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if (p_index<0 || p_index>=size()) {
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T& aux=*((T*)0); //nullreturn
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ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
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}
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const Element *I=front();
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int c=0;
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while(I) {
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if (c==p_index) {
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return I->get();
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}
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I=I->next();
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c++;
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}
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ERR_FAIL_V( *((T*)0) ); // bug!
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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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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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if (p_I->prev_ptr)
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p_I->prev_ptr->next_ptr=p_I->next_ptr;
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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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_data->last->next_ptr=p_I;
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p_I->prev_ptr=_data->last;
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p_I->next_ptr=NULL;
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_data->last=p_I;
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}
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void invert() {
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int s = size() / 2;
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Element *F = front();
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Element *B = back();
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for(int i=0;i<s;i++) {
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SWAP( F->value, B->value );
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F=F->next();
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B=B->prev();
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}
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}
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void move_to_front(Element* p_I) {
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ERR_FAIL_COND(p_I->data!=_data);
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if (!p_I->prev_ptr)
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return;
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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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if (p_I->prev_ptr)
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p_I->prev_ptr->next_ptr=p_I->next_ptr;
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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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_data->first->prev_ptr=p_I;
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p_I->next_ptr=_data->first;
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p_I->prev_ptr=NULL;
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_data->first=p_I;
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}
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void move_before(Element* value, Element* where) {
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if (value->prev_ptr) {
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value->prev_ptr->next_ptr = value->next_ptr;
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};
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if (value->next_ptr) {
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value->next_ptr->prev_ptr = value->prev_ptr;
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};
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value->next_ptr = where;
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if (!where) {
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value->prev_ptr = _data->last;
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_data->last = value;
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return;
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};
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value->prev_ptr = where->prev_ptr;
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if (where->prev_ptr) {
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where->prev_ptr->next_ptr = value;
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} else {
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_data->first = value;
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};
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where->prev_ptr = value;
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};
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/**
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* simple insertion sort
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*/
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void sort() {
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sort_custom< Comparator<T> >();
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}
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template<class C>
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void sort_custom() {
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if(size()<2)
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return;
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Element *from=front();
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Element *current=from;
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Element *to=from;
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while(current) {
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Element *next=current->next_ptr;
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//disconnect
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current->next_ptr=NULL;
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if (from!=current) {
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current->prev_ptr=NULL;
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current->next_ptr=from;
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Element *find=from;
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C less;
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while( find && less(find->value,current->value) ) {
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current->prev_ptr=find;
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current->next_ptr=find->next_ptr;
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find=find->next_ptr;
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}
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if (current->prev_ptr)
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current->prev_ptr->next_ptr=current;
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else
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from=current;
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if (current->next_ptr)
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current->next_ptr->prev_ptr=current;
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else
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to=current;
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} else {
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current->prev_ptr=NULL;
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current->next_ptr=NULL;
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}
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current=next;
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}
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_data->first=from;
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_data->last=to;
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}
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/**
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* copy constructor for the list
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*/
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List(const List& p_list) {
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_data=NULL;
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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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List() {
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_data=NULL;
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};
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~List() {
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clear();
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if (_data) {
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ERR_FAIL_COND(_data->size_cache);
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memdelete_allocator<_Data,A>(_data);
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}
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};
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};
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#endif
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