godot/core/list.h

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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. */
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/* */
/* 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"
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/**
* 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++;
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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++;
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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) {
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ERR_FAIL_COND(!p_A || !p_B);
ERR_FAIL_COND(p_A->data!=_data);
ERR_FAIL_COND(p_B->data!=_data);
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Element* A_prev=p_A->prev_ptr;
Element* A_next=p_A->next_ptr;
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p_A->next_ptr=p_B->next_ptr;
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)
p_A->prev_ptr->next_ptr=p_A;
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)
p_B->prev_ptr->next_ptr=p_B;
if (p_B->next_ptr)
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p_B->next_ptr->prev_ptr=p_B;
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}
/**
* 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;
}
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if (value->next_ptr) {
value->next_ptr->prev_ptr = value->prev_ptr;
}
else {
_data->last = value->prev_ptr;
}
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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() {
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sort_custom< Comparator<T> >();
}
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template<class C>
void sort_custom_inplace() {
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if(size()<2)
return;
Element *from=front();
Element *current=from;
Element *to=from;
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while(current) {
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Element *next=current->next_ptr;
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//disconnect
current->next_ptr=NULL;
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if (from!=current) {
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current->prev_ptr=NULL;
current->next_ptr=from;
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Element *find=from;
C less;
while( find && less(find->value,current->value) ) {
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current->prev_ptr=find;
current->next_ptr=find->next_ptr;
find=find->next_ptr;
}
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if (current->prev_ptr)
current->prev_ptr->next_ptr=current;
else
from=current;
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if (current->next_ptr)
current->next_ptr->prev_ptr=current;
else
to=current;
} else {
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current->prev_ptr=NULL;
current->next_ptr=NULL;
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}
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current=next;
}
_data->first=from;
_data->last=to;
}
template<class C>
struct AuxiliaryComparator {
C compare;
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_FORCE_INLINE_ bool operator()(const Element *a,const Element* b) const {
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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);
}
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/**
* 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