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godot/core/vector.h

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/*************************************************************************/
/* vector.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2015 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 VECTOR_H
#define VECTOR_H
/**
* @class Vector
* @author Juan Linietsky
* Vector container. Regular Vector Container. Use with care and for smaller arrays when possible. Use DVector for large arrays.
*/
#include "os/memory.h"
#include "error_macros.h"
#include "safe_refcount.h"
#include "sort.h"
template<class T>
class Vector {
mutable T* _ptr;
// internal helpers
_FORCE_INLINE_ SafeRefCount* _get_refcount() const {
if (!_ptr)
return NULL;
return reinterpret_cast<SafeRefCount*>((uint8_t*)_ptr-sizeof(int)-sizeof(SafeRefCount));
}
_FORCE_INLINE_ int* _get_size() const {
if (!_ptr)
return NULL;
return reinterpret_cast<int*>((uint8_t*)_ptr-sizeof(int));
}
_FORCE_INLINE_ T* _get_data() const {
if (!_ptr)
return NULL;
return reinterpret_cast<T*>(_ptr);
}
_FORCE_INLINE_ int _get_alloc_size(int p_elements) const {
return nearest_power_of_2(p_elements*sizeof(T)+sizeof(SafeRefCount)+sizeof(int));
}
void _unref(void *p_data);
void _copy_from(const Vector& p_from);
void _copy_on_write();
public:
_FORCE_INLINE_ T *ptr() { if (!_ptr) return NULL; _copy_on_write(); return (T*)_get_data(); }
_FORCE_INLINE_ const T *ptr() const { if (!_ptr) return NULL; return _get_data(); }
_FORCE_INLINE_ void clear() { resize(0); }
_FORCE_INLINE_ int size() const {
int* size = _get_size();
if (size)
return *size;
else
return 0;
}
_FORCE_INLINE_ bool empty() const { return _ptr == 0; }
Error resize(int p_size);
bool push_back(T p_elem);
void remove(int p_index);
void erase(const T& p_val) { int idx = find(p_val); if (idx>=0) remove(idx); };
void invert();
template <class T_val>
int find(const T_val& p_val) const;
void set(int p_index,T p_elem);
T get(int p_index) const;
inline 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);
}
_copy_on_write(); // wants to write, so copy on write.
return _get_data()[p_index];
}
inline const T& operator[](int p_index) const {
if (p_index<0 || p_index>=size()) {
const T& aux=*((T*)0); //nullreturn
ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
}
// no cow needed, since it's reading
return _get_data()[p_index];
}
Error insert(int p_pos,const T& p_val);
template<class C>
void sort_custom() {
int len = size();
if (len==0)
return;
T *data = &operator[](0);
SortArray<T,C> sorter;
sorter.sort(data,len);
}
void sort() {
sort_custom<_DefaultComparator<T> >();
}
void ordered_insert(const T& p_val) {
int i;
for (i=0; i<size(); i++) {
if (p_val < operator[](i)) {
break;
};
};
insert(i, p_val);
}
void operator=(const Vector& p_from);
Vector(const Vector& p_from);
_FORCE_INLINE_ Vector();
_FORCE_INLINE_ ~Vector();
};
template<class T>
void Vector<T>::_unref(void *p_data) {
if (!p_data)
return;
SafeRefCount *src = reinterpret_cast<SafeRefCount*>((uint8_t*)p_data-sizeof(int)-sizeof(SafeRefCount));
if (!src->unref())
return; // still in use
// clean up
int *count = (int*)(src+1);
T *data = (T*)(count+1);
for (int i=0;i<*count;i++) {
// call destructors
data[i].~T();
}
// free mem
memfree((uint8_t*)p_data-sizeof(int)-sizeof(SafeRefCount));
}
template<class T>
void Vector<T>::_copy_on_write() {
if (!_ptr)
return;
if (_get_refcount()->get() > 1 ) {
/* in use by more than me */
void* mem_new = memalloc(_get_alloc_size(*_get_size()));
SafeRefCount *src_new=(SafeRefCount *)mem_new;
src_new->init();
int * _size = (int*)(src_new+1);
*_size=*_get_size();
T*_data=(T*)(_size+1);
// initialize new elements
for (int i=0;i<*_size;i++) {
memnew_placement(&_data[i], T( _get_data()[i] ) );
}
_unref(_ptr);
_ptr=_data;
}
}
template<class T> template<class T_val>
int Vector<T>::find(const T_val &p_val) const {
int ret = -1;
if (size() == 0)
return ret;
for (int i=0; i<size(); i++) {
if (operator[](i) == p_val) {
ret = i;
break;
};
};
return ret;
};
template<class T>
Error Vector<T>::resize(int p_size) {
ERR_FAIL_COND_V(p_size<0,ERR_INVALID_PARAMETER);
if (p_size==size())
return OK;
if (p_size==0) {
// wants to clean up
_unref(_ptr);
_ptr=NULL;
return OK;
}
// possibly changing size, copy on write
_copy_on_write();
if (p_size>size()) {
if (size()==0) {
// alloc from scratch
void* ptr=memalloc(_get_alloc_size(p_size));
ERR_FAIL_COND_V( !ptr ,ERR_OUT_OF_MEMORY);
_ptr=(T*)((uint8_t*)ptr+sizeof(int)+sizeof(SafeRefCount));
_get_refcount()->init(); // init refcount
*_get_size()=0; // init size (currently, none)
} else {
void *_ptrnew = (T*)memrealloc((uint8_t*)_ptr-sizeof(int)-sizeof(SafeRefCount),_get_alloc_size(p_size));
ERR_FAIL_COND_V( !_ptrnew ,ERR_OUT_OF_MEMORY);
_ptr=(T*)((uint8_t*)_ptrnew+sizeof(int)+sizeof(SafeRefCount));
}
// construct the newly created elements
T*elems = _get_data();
for (int i=*_get_size();i<p_size;i++) {
memnew_placement(&elems[i], T) ;
}
*_get_size()=p_size;
} else if (p_size<size()) {
// deinitialize no longer needed elements
for (int i=p_size;i<*_get_size();i++) {
T* t = &_get_data()[i];
t->~T();
}
void *_ptrnew = (T*)memrealloc((uint8_t*)_ptr-sizeof(int)-sizeof(SafeRefCount),_get_alloc_size(p_size));
ERR_FAIL_COND_V( !_ptrnew ,ERR_OUT_OF_MEMORY);
_ptr=(T*)((uint8_t*)_ptrnew+sizeof(int)+sizeof(SafeRefCount));
*_get_size()=p_size;
}
return OK;
}
template<class T>
void Vector<T>::invert() {
for(int i=0;i<size()/2;i++) {
SWAP( operator[](i), operator[](size()-i-1) );
}
}
template<class T>
void Vector<T>::set(int p_index,T p_elem) {
operator[](p_index)=p_elem;
}
template<class T>
T Vector<T>::get(int p_index) const {
return operator[](p_index);
}
template<class T>
bool Vector<T>::push_back(T p_elem) {
Error err = resize(size()+1);
ERR_FAIL_COND_V( err, true )
set(size()-1,p_elem);
return false;
}
template<class T>
void Vector<T>::remove(int p_index) {
ERR_FAIL_INDEX(p_index, size());
T*p=ptr();
int len=size();
for (int i=p_index; i<len-1; i++) {
p[i]=p[i+1];
};
resize(len-1);
};
template<class T>
void Vector<T>::_copy_from(const Vector& p_from) {
if (_ptr == p_from._ptr)
return; // self assign, do nothing.
_unref(_ptr);
_ptr=NULL;
if (!p_from._ptr)
return; //nothing to do
if (p_from._get_refcount()->ref()) // could reference
_ptr=p_from._ptr;
}
template<class T>
void Vector<T>::operator=(const Vector& p_from) {
_copy_from(p_from);
}
template<class T>
Error Vector<T>::insert(int p_pos,const T& p_val) {
ERR_FAIL_INDEX_V(p_pos,size()+1,ERR_INVALID_PARAMETER);
resize(size()+1);
for (int i=(size()-1);i>p_pos;i--)
set( i, get(i-1) );
set( p_pos, p_val );
return OK;
}
template<class T>
Vector<T>::Vector(const Vector& p_from) {
_ptr=NULL;
_copy_from( p_from );
}
template<class T>
Vector<T>::Vector() {
_ptr=NULL;
}
template<class T>
Vector<T>::~Vector() {
_unref(_ptr);
}
#endif
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