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godot/core/list.h
Rémi Verschelde d8223ffa75 Welcome in 2017, dear changelog reader! 
That year should bring the long-awaited OpenGL ES 3.0 compatible renderer
with state-of-the-art rendering techniques tuned to work as low as middle
end handheld devices - without compromising with the possibilities given
for higher end desktop games of course. Great times ahead for the Godot
community and the gamers that will play our games!

(cherry picked from commit c7bc44d5ad)
2017-01-12 19:15:30 +01:00

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/*************************************************************************/
/* list.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef GLOBALS_LIST_H
#define GLOBALS_LIST_H
#include "os/memory.h"
#include "sort.h"
/**
* Generic Templatized Linked List Implementation.
* The implementation differs from the STL one because
* a compatible preallocated linked list can be written
* using the same API, or features such as erasing an element
* from the iterator.
*/
template <class T,class A=DefaultAllocator>
class List {
struct _Data;
public:
class Element {
private:
friend class List<T,A>;
T value;
Element* next_ptr;
Element* prev_ptr;
_Data *data;
public:
/**
* Get NEXT Element iterator, for constant lists.
*/
_FORCE_INLINE_ const Element* next() const {
return next_ptr;
};
/**
* Get NEXT Element iterator,
*/
_FORCE_INLINE_ Element* next() {
return next_ptr;
};
/**
* Get PREV Element iterator, for constant lists.
*/
_FORCE_INLINE_ const Element* prev() const {
return prev_ptr;
};
/**
* Get PREV Element iterator,
*/
_FORCE_INLINE_ Element* prev() {
return prev_ptr;
};
/**
* * operator, for using as *iterator, when iterators are defined on stack.
*/
_FORCE_INLINE_ const T& operator *() const {
return value;
};
/**
* operator->, for using as iterator->, when iterators are defined on stack, for constant lists.
*/
_FORCE_INLINE_ const T* operator->() const {
return &value;
};
/**
* * operator, for using as *iterator, when iterators are defined on stack,
*/
_FORCE_INLINE_ T& operator *() {
return value;
};
/**
* operator->, for using as iterator->, when iterators are defined on stack, for constant lists.
*/
_FORCE_INLINE_ T* operator->() {
return &value;
};
/**
* get the value stored in this element.
*/
_FORCE_INLINE_ T& get() {
return value;
};
/**
* get the value stored in this element, for constant lists
*/
_FORCE_INLINE_ const T& get() const {
return value;
};
/**
* set the value stored in this element.
*/
_FORCE_INLINE_ void set(const T& p_value) {
value = (T&)p_value;
};
void erase() {
data->erase(this);
}
_FORCE_INLINE_ Element() {
next_ptr = 0;
prev_ptr = 0;
data=NULL;
};
};
private:
struct _Data {
Element* first;
Element* last;
int size_cache;
bool erase(const Element* p_I) {
ERR_FAIL_COND_V(!p_I,false);
ERR_FAIL_COND_V(p_I->data!=this,false);
if (first==p_I) {
first=p_I->next_ptr;
};
if (last==p_I)
last=p_I->prev_ptr;
if (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;
memdelete_allocator<Element,A>( const_cast<Element*>(p_I) );
size_cache--;
return true;
}
};
_Data *_data;
public:
/**
* return an const iterator to the begining of the list.
*/
_FORCE_INLINE_ const Element* front() const {
return _data?_data->first:0;
};
/**
* return an iterator to the begining of the list.
*/
_FORCE_INLINE_ Element* front() {
return _data?_data->first:0;
};
/**
* return an const iterator to the last member of the list.
*/
_FORCE_INLINE_ const Element* back() const {
return _data?_data->last:0;
};
/**
* return an iterator to the last member of the list.
*/
_FORCE_INLINE_ Element* back() {
return _data?_data->last:0;
};
/**
* store a new element at the end of the list
*/
Element* push_back(const T& value) {
if (!_data) {
_data=memnew_allocator(_Data,A);
_data->first=NULL;
_data->last=NULL;
_data->size_cache=0;
}
Element* n = memnew_allocator(Element,A);
n->value = (T&)value;
n->prev_ptr=_data->last;
n->next_ptr=0;
n->data=_data;
if (_data->last) {
_data->last->next_ptr=n;
}
_data->last = n;
if (!_data->first)
_data->first=n;
_data->size_cache++;
return n;
};
void pop_back() {
if (_data && _data->last)
erase(_data->last);
}
/**
* store a new element at the begining of the list
*/
Element* push_front(const T& value) {
if (!_data) {
_data=memnew_allocator(_Data,A);
_data->first=NULL;
_data->last=NULL;
_data->size_cache=0;
}
Element* n = memnew_allocator(Element,A);
n->value = (T&)value;
n->prev_ptr = 0;
n->next_ptr = _data->first;
n->data=_data;
if (_data->first) {
_data->first->prev_ptr=n;
}
_data->first = n;
if (!_data->last)
_data->last=n;
_data->size_cache++;
return n;
};
void pop_front() {
if (_data && _data->first)
erase(_data->first);
}
/**
* find an element in the list,
*/
template<class T_v>
Element* find(const T_v& p_val) {
Element* it = front();
while (it) {
if (it->value == p_val) return it;
it = it->next();
};
return NULL;
};
/**
* erase an element in the list, by iterator pointing to it. Return true if it was found/erased.
*/
bool erase(const Element* p_I) {
if (_data) {
bool ret = _data->erase(p_I);
if (_data->size_cache==0) {
memdelete_allocator<_Data,A>(_data);
_data=NULL;
}
return ret;
}
return false;
};
/**
* erase the first element in the list, that contains value
*/
bool erase(const T& value) {
Element* I = find(value);
return erase(I);
};
/**
* return wether the list is empty
*/
_FORCE_INLINE_ bool empty() const {
return (!_data || !_data->size_cache);
}
/**
* clear the list
*/
void clear() {
while (front()) {
erase(front());
};
};
_FORCE_INLINE_ int size() const {
return _data?_data->size_cache:0;
}
void swap(Element* p_A, Element *p_B) {
ERR_FAIL_COND(!p_A || !p_B);
ERR_FAIL_COND(p_A->data!=_data);
ERR_FAIL_COND(p_B->data!=_data);
Element* A_prev=p_A->prev_ptr;
Element* A_next=p_A->next_ptr;
p_A->next_ptr=p_B->next_ptr;
p_A->prev_ptr=p_B->prev_ptr;
p_B->next_ptr=A_next;
p_B->prev_ptr=A_prev;
if (p_A->prev_ptr)
p_A->prev_ptr->next_ptr=p_A;
if (p_A->next_ptr)
p_A->next_ptr->prev_ptr=p_A;
if (p_B->prev_ptr)
p_B->prev_ptr->next_ptr=p_B;
if (p_B->next_ptr)
p_B->next_ptr->prev_ptr=p_B;
}
/**
* copy the list
*/
void operator=(const List& p_list) {
clear();
const Element *it=p_list.front();
while (it) {
push_back( it->get() );
it=it->next();
}
}
T& operator[](int p_index) {
if (p_index<0 || p_index>=size()) {
T& aux=*((T*)0); //nullreturn
ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
}
Element *I=front();
int c=0;
while(I) {
if (c==p_index) {
return I->get();
}
I=I->next();
c++;
}
ERR_FAIL_V( *((T*)0) ); // bug!!
}
const T& operator[](int p_index) const {
if (p_index<0 || p_index>=size()) {
T& aux=*((T*)0); //nullreturn
ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
}
const Element *I=front();
int c=0;
while(I) {
if (c==p_index) {
return I->get();
}
I=I->next();
c++;
}
ERR_FAIL_V( *((T*)0) ); // bug!
}
void move_to_back(Element* p_I) {
ERR_FAIL_COND(p_I->data!=_data);
if (!p_I->next_ptr)
return;
if (_data->first==p_I) {
_data->first=p_I->next_ptr;
};
if (_data->last==p_I)
_data->last=p_I->prev_ptr;
if (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->last->next_ptr=p_I;
p_I->prev_ptr=_data->last;
p_I->next_ptr=NULL;
_data->last=p_I;
}
void invert() {
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;
if (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=NULL;
_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<class 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;
//disconnect
current->next_ptr=NULL;
if (from!=current) {
current->prev_ptr=NULL;
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=NULL;
current->next_ptr=NULL;
}
current=next;
}
_data->first=from;
_data->last=to;
}
template<class C>
struct AuxiliaryComparator {
C compare;
_FORCE_INLINE_ bool operator()(const Element *a,const Element* b) const {
return compare(a->value,b->value);
}
};
template<class 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=NULL;
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=NULL;
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);
}
/**
* copy constructor for the list
*/
List(const List& p_list) {
_data=NULL;
const Element *it=p_list.front();
while (it) {
push_back( it->get() );
it=it->next();
}
}
List() {
_data=NULL;
};
~List() {
clear();
if (_data) {
ERR_FAIL_COND(_data->size_cache);
memdelete_allocator<_Data,A>(_data);
}
};
};
#endif
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