3 |
* LinuxSampler - modular, streaming capable sampler * |
* LinuxSampler - modular, streaming capable sampler * |
4 |
* * |
* * |
5 |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
6 |
* Copyright (C) 2005 - 2008 Christian Schoenebeck * |
* Copyright (C) 2005 - 2017 Christian Schoenebeck * |
7 |
* * |
* * |
8 |
* This program is free software; you can redistribute it and/or modify * |
* This program is free software; you can redistribute it and/or modify * |
9 |
* it under the terms of the GNU General Public License as published by * |
* it under the terms of the GNU General Public License as published by * |
46 |
|
|
47 |
const std::string __err_msg_resize_while_in_use = "Pool::resizePool() ERROR: elements still in use!"; |
const std::string __err_msg_resize_while_in_use = "Pool::resizePool() ERROR: elements still in use!"; |
48 |
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|
49 |
|
/** |
50 |
|
* Unique numeric ID for exactly one incarnation of one element allocated from |
51 |
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* a Pool. As soon as the respective element is once freed back to the Pool, |
52 |
|
* the ID becomes invalid. Such an ID may be used to safely store an abstract |
53 |
|
* reference to one Pool element for longer time. Since the Pool classes |
54 |
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* automatically detect whether an ID became invalid, using such an ID is thus |
55 |
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* safer than storing an Iterator or even a raw pointer in use case scenarios of |
56 |
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* storing long term references to Pool elements. |
57 |
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* |
58 |
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* This ID type is currently set (constrained) to 32-bit because the current |
59 |
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* real-time instrument script infrastructure implementation, which heavily |
60 |
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* relies on element IDs, is currently using 32-bit for its integer script |
61 |
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* variable type. |
62 |
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*/ |
63 |
|
typedef uint32_t pool_element_id_t; |
64 |
|
|
65 |
// just symbol prototyping |
// just symbol prototyping |
66 |
template<typename T> class Pool; |
template<typename T> class Pool; |
67 |
template<typename T> class RTList; |
template<typename T> class RTList; |
77 |
#if CONFIG_DEVMODE |
#if CONFIG_DEVMODE |
78 |
RTListBase<T1>* list; // list to which this node currently belongs to |
RTListBase<T1>* list; // list to which this node currently belongs to |
79 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
80 |
|
uint reincarnation; // just for Pool::fromID() |
81 |
|
|
82 |
_Node() { |
_Node() { |
83 |
next = NULL; |
next = NULL; |
86 |
#if CONFIG_DEVMODE |
#if CONFIG_DEVMODE |
87 |
list = NULL; |
list = NULL; |
88 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
89 |
|
reincarnation = 0; |
90 |
|
} |
91 |
|
|
92 |
|
inline void bumpReincarnation(uint bits) { |
93 |
|
reincarnation++; |
94 |
|
// constrain the bitrange of "reincarnation", because Pool::fromID() will shift up/down for pool_element_id_t and compare this bitwise |
95 |
|
reincarnation &= ((1 << bits) - 1); |
96 |
} |
} |
97 |
}; |
}; |
98 |
typedef _Node<T> Node; |
typedef _Node<T> Node; |
99 |
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|
100 |
public: |
public: |
101 |
|
/** |
102 |
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* Pointer-like object which allows to iterate over elements of a RTList, |
103 |
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* similar to iterators of STL container classes. Note that the main |
104 |
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* purpose of this class is to access elements of a list / pool i.e. |
105 |
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* within a @c while() loop. If you rather want to keep a reference to |
106 |
|
* one particular element (i.e. for longer time) then you might |
107 |
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* consider using @c pool_element_id_t variables instead. |
108 |
|
*/ |
109 |
template<typename T1> |
template<typename T1> |
110 |
class _Iterator { |
class _Iterator { |
111 |
public: |
public: |
177 |
} |
} |
178 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
179 |
return *current->data; |
return *current->data; |
180 |
|
} |
181 |
|
|
182 |
|
inline const T1& operator*() const { |
183 |
|
#if CONFIG_DEVMODE |
184 |
|
if (!isValid()) { // if iterator became invalidated |
185 |
|
#if CONFIG_RT_EXCEPTIONS |
186 |
|
throw std::runtime_error(__err_msg_iterator_invalidated); |
187 |
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#else |
188 |
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std::cerr << __err_msg_iterator_invalidated << std::endl << std::flush; |
189 |
|
return *((const T1*)NULL); // force segfault if iterator became invalidated |
190 |
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#endif // CONFIG_RT_EXCEPTIONS |
191 |
|
} |
192 |
|
#endif // CONFIG_DEVMODE |
193 |
|
return *current->data; |
194 |
} |
} |
195 |
|
|
196 |
inline T1* operator->() { |
inline T1* operator->() { |
207 |
return current->data; |
return current->data; |
208 |
} |
} |
209 |
|
|
210 |
inline bool operator==(const _Iterator<T1> other) { |
inline const T1* operator->() const { |
211 |
|
#if CONFIG_DEVMODE |
212 |
|
if (!isValid()) { // if iterator became invalidated |
213 |
|
#if CONFIG_RT_EXCEPTIONS |
214 |
|
throw std::runtime_error(__err_msg_iterator_invalidated); |
215 |
|
#else |
216 |
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std::cerr << __err_msg_iterator_invalidated << std::endl << std::flush; |
217 |
|
return (const T1*)NULL; // force segfault if iterator became invalidated |
218 |
|
#endif // CONFIG_RT_EXCEPTIONS |
219 |
|
} |
220 |
|
#endif // CONFIG_DEVMODE |
221 |
|
return current->data; |
222 |
|
} |
223 |
|
|
224 |
|
inline bool operator==(const _Iterator<T1> other) const { |
225 |
return current == other.current; |
return current == other.current; |
226 |
} |
} |
227 |
|
|
228 |
inline bool operator!=(const _Iterator<T1> other) { |
inline bool operator!=(const _Iterator<T1> other) const { |
229 |
return current != other.current; |
return current != other.current; |
230 |
} |
} |
231 |
|
|
237 |
return !(current && current->data); |
return !(current && current->data); |
238 |
} |
} |
239 |
|
|
240 |
|
/** |
241 |
|
* Moves the element pointed by this Iterator from its current |
242 |
|
* list to the beginning of the destination list @a pDstList. |
243 |
|
* |
244 |
|
* @b CAUTION: When this method returns, this Iterator does |
245 |
|
* @b NOT point to the element on the new list anymore, instead it |
246 |
|
* points at a completely different element! In case of a |
247 |
|
* forward Iterator this Iterator object will point to the |
248 |
|
* previous element on the source list, in case of a backward |
249 |
|
* Iterator it will point to the subsequent element on the |
250 |
|
* source list. This behavior is enforced to avoid breaking an |
251 |
|
* active loop code working with this Iterator object. |
252 |
|
* |
253 |
|
* Thus if you intend to continue working with the same element, |
254 |
|
* you should do like this: |
255 |
|
* @code |
256 |
|
* it = it.moveToEndOf(anotherList); |
257 |
|
* @endcode |
258 |
|
* |
259 |
|
* @param pDstList - destination list |
260 |
|
* @returns Iterator object pointing at the moved element on |
261 |
|
* the destination list |
262 |
|
*/ |
263 |
inline _Iterator moveToEndOf(RTListBase<T1>* pDstList) { |
inline _Iterator moveToEndOf(RTListBase<T1>* pDstList) { |
264 |
detach(); |
detach(); |
265 |
pDstList->append(*this); |
pDstList->append(*this); |
268 |
return iterOnDstList; |
return iterOnDstList; |
269 |
} |
} |
270 |
|
|
271 |
|
/** |
272 |
|
* Moves the element pointed by this Iterator from its current |
273 |
|
* list to the end of destination list @a pDstList. |
274 |
|
* |
275 |
|
* @b CAUTION: When this method returns, this Iterator does |
276 |
|
* @b NOT point to the element on the new list anymore, instead it |
277 |
|
* points at a completely different element! In case of a |
278 |
|
* forward Iterator this Iterator object will point to the |
279 |
|
* previous element on the source list, in case of a backward |
280 |
|
* Iterator it will point to the subsequent element on the |
281 |
|
* source list. This behavior is enforced to avoid breaking an |
282 |
|
* active loop code working with this Iterator object. |
283 |
|
* |
284 |
|
* Thus if you intend to continue working with the same element, |
285 |
|
* you should do like this: |
286 |
|
* @code |
287 |
|
* it = it.moveToBeginOf(anotherList); |
288 |
|
* @endcode |
289 |
|
* |
290 |
|
* @param pDstList - destination list |
291 |
|
* @returns Iterator object pointing at the moved element on |
292 |
|
* the destination list |
293 |
|
*/ |
294 |
inline _Iterator moveToBeginOf(RTListBase<T1>* pDstList) { |
inline _Iterator moveToBeginOf(RTListBase<T1>* pDstList) { |
295 |
detach(); |
detach(); |
296 |
pDstList->prepend(*this); |
pDstList->prepend(*this); |
299 |
return iterOnDstList; |
return iterOnDstList; |
300 |
} |
} |
301 |
|
|
302 |
|
/** |
303 |
|
* Moves the element pointed by this Iterator from its current |
304 |
|
* position to the position right before @a itDst. That move |
305 |
|
* may either be from and to the same list, or to a another |
306 |
|
* list. |
307 |
|
* |
308 |
|
* @b CAUTION: When this method returns, this Iterator does |
309 |
|
* @b NOT point to the element on the new list anymore, instead it |
310 |
|
* points at a completely different element! In case of a |
311 |
|
* forward Iterator this Iterator object will point to the |
312 |
|
* previous element on the source list, in case of a backward |
313 |
|
* Iterator it will point to the subsequent element on the |
314 |
|
* source list. This behavior is enforced to avoid breaking an |
315 |
|
* active loop code working with this Iterator object. |
316 |
|
* |
317 |
|
* Thus if you intend to continue working with the same element, |
318 |
|
* you should do like this: |
319 |
|
* @code |
320 |
|
* itSourceElement = itSourceElement.moveBefore(itDestinationElement); |
321 |
|
* @endcode |
322 |
|
* |
323 |
|
* @param itDst - destination element to be inserted before |
324 |
|
* @returns Iterator object pointing at the moved element on |
325 |
|
* the destination list |
326 |
|
*/ |
327 |
|
inline _Iterator moveBefore(_Iterator<T1> itDst) { |
328 |
|
detach(); |
329 |
|
RTList<T1>::prependBefore(*this, itDst); |
330 |
|
_Iterator iterOnDstList = _Iterator(current); |
331 |
|
current = fallback; |
332 |
|
return iterOnDstList; |
333 |
|
} |
334 |
|
|
335 |
|
/** |
336 |
|
* Moves the element pointed by this Iterator from its current |
337 |
|
* position to the position right after @a itDst. That move |
338 |
|
* may either be from and to the same list, or to a another |
339 |
|
* list. |
340 |
|
* |
341 |
|
* @b CAUTION: When this method returns, this Iterator does |
342 |
|
* @b NOT point to the element on the new list anymore, instead it |
343 |
|
* points at a completely different element! In case of a |
344 |
|
* forward Iterator this Iterator object will point to the |
345 |
|
* previous element on the source list, in case of a backward |
346 |
|
* Iterator it will point to the subsequent element on the |
347 |
|
* source list. This behavior is enforced to avoid breaking an |
348 |
|
* active loop code working with this Iterator object. |
349 |
|
* |
350 |
|
* Thus if you intend to continue working with the same element, |
351 |
|
* you should do like this: |
352 |
|
* @code |
353 |
|
* itSourceElement = itSourceElement.moveAfter(itDestinationElement); |
354 |
|
* @endcode |
355 |
|
* |
356 |
|
* @param itDst - destination element to be inserted after |
357 |
|
* @returns Iterator object pointing at the moved element on |
358 |
|
* the destination list |
359 |
|
*/ |
360 |
|
inline _Iterator moveAfter(_Iterator<T1> itDst) { |
361 |
|
detach(); |
362 |
|
RTList<T1>::appendAfter(*this, itDst); |
363 |
|
_Iterator iterOnDstList = _Iterator(current); |
364 |
|
current = fallback; |
365 |
|
return iterOnDstList; |
366 |
|
} |
367 |
|
|
368 |
#if CONFIG_DEVMODE |
#if CONFIG_DEVMODE |
369 |
inline bool isValid() { |
inline bool isValid() const { |
370 |
return current->list == list; |
return current->list == list; |
371 |
} |
} |
372 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
403 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
404 |
} |
} |
405 |
|
|
406 |
|
inline const Node* node() const { |
407 |
|
#if CONFIG_DEVMODE |
408 |
|
#if CONFIG_RT_EXCEPTIONS |
409 |
|
if (isValid()) return current; |
410 |
|
else throw std::runtime_error(__err_msg_iterator_invalidated); |
411 |
|
#else |
412 |
|
return (isValid()) ? current : (const Node*)NULL; // force segfault if iterator became invalidated |
413 |
|
#endif // CONFIG_RT_EXCEPTIONS |
414 |
|
#else |
415 |
|
return current; |
416 |
|
#endif // CONFIG_DEVMODE |
417 |
|
} |
418 |
|
|
419 |
inline void detach() { |
inline void detach() { |
420 |
RTListBase<T1>::detach(*this); |
RTListBase<T1>::detach(*this); |
421 |
} |
} |
442 |
return Iterator(&_end, Iterator::dir_backward); |
return Iterator(&_end, Iterator::dir_backward); |
443 |
} |
} |
444 |
|
|
445 |
inline bool isEmpty() { |
inline bool isEmpty() const { |
446 |
return _begin.next == &_end; |
return _begin.next == &_end; |
447 |
} |
} |
448 |
|
|
530 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
531 |
} |
} |
532 |
|
|
533 |
|
static inline void prependBefore(Iterator itSrc, Iterator itDst) { |
534 |
|
Node* src = itSrc.current; |
535 |
|
Node* dst = itDst.current; |
536 |
|
Node* prev = dst->prev; |
537 |
|
prev->next = src; |
538 |
|
dst->prev = src; |
539 |
|
src->prev = prev; |
540 |
|
src->next = dst; |
541 |
|
#if CONFIG_DEVMODE |
542 |
|
src->list = this; |
543 |
|
#endif // CONFIG_DEVMODE |
544 |
|
} |
545 |
|
|
546 |
|
static inline void appendAfter(Iterator itSrc, Iterator itDst) { |
547 |
|
Node* src = itSrc.current; |
548 |
|
Node* dst = itDst.current; |
549 |
|
Node* next = dst->next; |
550 |
|
next->prev = src; |
551 |
|
dst->next = src; |
552 |
|
src->prev = dst; |
553 |
|
src->next = next; |
554 |
|
#if CONFIG_DEVMODE |
555 |
|
src->list = this; |
556 |
|
#endif // CONFIG_DEVMODE |
557 |
|
} |
558 |
|
|
559 |
static inline void detach(Iterator itElement) { |
static inline void detach(Iterator itElement) { |
560 |
Node* pNode = itElement.node(); |
Node* pNode = itElement.node(); |
561 |
Node* prev = pNode->prev; // if a segfault happens here, then because 'itElement' Iterator became invalidated |
Node* prev = pNode->prev; // if a segfault happens here, then because 'itElement' Iterator became invalidated |
597 |
*/ |
*/ |
598 |
RTList(RTList<T>& list) : RTListBase<T>::RTListBase() { |
RTList(RTList<T>& list) : RTListBase<T>::RTListBase() { |
599 |
this->pPool = list.pPool; |
this->pPool = list.pPool; |
600 |
RTList<T>::Iterator it = list.first(); |
Iterator it = list.first(); |
601 |
RTList<T>::Iterator end = list.end(); |
Iterator end = list.end(); |
602 |
for(; it != end; ++it) { |
for(; it != end; ++it) { |
603 |
if (poolIsEmpty()) break; |
if (poolIsEmpty()) break; |
604 |
*(allocAppend()) = *it; |
*(allocAppend()) = *it; |
609 |
clear(); |
clear(); |
610 |
} |
} |
611 |
|
|
612 |
inline bool poolIsEmpty() { |
inline bool poolIsEmpty() const { |
613 |
return pPool->poolIsEmpty(); |
return pPool->poolIsEmpty(); |
614 |
} |
} |
615 |
|
|
616 |
inline Iterator allocAppend() { |
inline Iterator allocAppend() { |
617 |
if (pPool->poolIsEmpty()) return RTListBase<T>::begin(); |
if (pPool->poolIsEmpty()) return RTListBase<T>::begin(); |
618 |
Iterator element = pPool->alloc(); |
Iterator element = pPool->alloc(); |
619 |
append(element); |
this->append(element); |
620 |
#if CONFIG_DEVMODE |
#if CONFIG_DEVMODE |
621 |
element.list = this; |
element.list = this; |
622 |
#endif // CONFIG_DEVMODE |
#endif // CONFIG_DEVMODE |
648 |
} |
} |
649 |
} |
} |
650 |
|
|
651 |
|
inline pool_element_id_t getID(const T* obj) const { |
652 |
|
return pPool->getID(obj); |
653 |
|
} |
654 |
|
|
655 |
|
inline pool_element_id_t getID(const Iterator& it) const { |
656 |
|
return pPool->getID(&*it); |
657 |
|
} |
658 |
|
|
659 |
|
inline Iterator fromID(pool_element_id_t id) const { |
660 |
|
return pPool->fromID(id); |
661 |
|
} |
662 |
|
|
663 |
|
inline Iterator fromPtr(const T* obj) const { |
664 |
|
return pPool->fromPtr(obj); |
665 |
|
} |
666 |
|
|
667 |
protected: |
protected: |
668 |
Pool<T>* pPool; |
Pool<T>* pPool; |
669 |
}; |
}; |
677 |
Node* nodes; |
Node* nodes; |
678 |
T* data; |
T* data; |
679 |
RTListBase<T> freelist; // not yet allocated elements |
RTListBase<T> freelist; // not yet allocated elements |
680 |
int poolsize; |
uint poolsize; |
681 |
|
// following 3 used for element ID generation (and vice versa) |
682 |
|
uint poolsizebits; ///< Amount of bits required to index all elements of this pool (according to current pool size). |
683 |
|
uint reservedbits; ///< 3rd party reserved bits on the left side of id (default: 0). |
684 |
|
uint reincarnationbits; ///< Amount of bits allowed for reincarnation counter. |
685 |
|
|
686 |
Pool(int Elements) : RTList<T>::RTList(this) { |
Pool(int Elements) : RTList<T>::RTList(this), reservedbits(0) { |
687 |
_init(Elements); |
_init(Elements); |
688 |
} |
} |
689 |
|
|
692 |
if (data) delete[] data; |
if (data) delete[] data; |
693 |
} |
} |
694 |
|
|
695 |
inline bool poolIsEmpty() { |
inline bool poolIsEmpty() const { |
696 |
return freelist.isEmpty(); |
return freelist.isEmpty(); |
697 |
} |
} |
698 |
|
|
704 |
* |
* |
705 |
* @see resizePool() |
* @see resizePool() |
706 |
*/ |
*/ |
707 |
int poolSize() const { |
uint poolSize() const { |
708 |
return poolsize; |
return poolsize; |
709 |
} |
} |
710 |
|
|
737 |
_init(Elements); |
_init(Elements); |
738 |
} |
} |
739 |
|
|
740 |
|
/** |
741 |
|
* Sets the amount of bits on the left hand side of pool_element_id_t |
742 |
|
* numbers to be reserved for 3rd party usage. So if you pass @c 1 for |
743 |
|
* argument @a bits for example, then all generated element IDs will be |
744 |
|
* maximum 31 bit large. |
745 |
|
* |
746 |
|
* By default there are no reserved bits, and thus by default all IDs |
747 |
|
* are max. 32 bit large. |
748 |
|
* |
749 |
|
* @param bits - amount of bits to reserve on every ID for other purposes |
750 |
|
* @see pool_element_id_t |
751 |
|
*/ |
752 |
|
void setPoolElementIDsReservedBits(uint bits) { |
753 |
|
reservedbits = bits; |
754 |
|
updateReincarnationBits(); |
755 |
|
} |
756 |
|
|
757 |
|
/** |
758 |
|
* Returns an abstract, unique numeric ID for the given object of |
759 |
|
* this pool, it returns 0 in case the passed object is not a member |
760 |
|
* of this Pool, i.e. because it is simply an invalid pointer or member |
761 |
|
* of another Pool. The returned ID is unique among all elements of this |
762 |
|
* Pool and it differs with each reincarnation of an object. That means |
763 |
|
* each time you free an element to and allocate the same element back |
764 |
|
* from the Pool, it will have a different ID. |
765 |
|
* |
766 |
|
* A valid ID will never be zero, so you may use ID values of 0 in your |
767 |
|
* data structures for special purposes (i.e. reflecting an invalid |
768 |
|
* object ID or not yet assigned object). |
769 |
|
* |
770 |
|
* Members are always translated both, from Iterators/pointers to IDs, |
771 |
|
* and from IDs to Iterators/pointers in constant time. |
772 |
|
* |
773 |
|
* You might want to use this alternative approach of referencing Pool |
774 |
|
* members under certain scenarios. For example if you need to expose |
775 |
|
* an ID to the end user and/or if you want to represent an object of |
776 |
|
* this pool by a smaller number instead of a native pointer (i.e. 16 |
777 |
|
* bits vs. 64 bits). You can also detect this way whether the object |
778 |
|
* has already been freed / reallocated from the Pool in the meantime. |
779 |
|
* |
780 |
|
* @param obj - raw pointer to a data member of this Pool |
781 |
|
* @returns unique numeric ID (!= 0) of @a obj or 0 if pointer was invalid |
782 |
|
*/ |
783 |
|
pool_element_id_t getID(const T* obj) const { |
784 |
|
if (!poolsize) return 0; |
785 |
|
int index = int( obj - &data[0] ); |
786 |
|
if (index < 0 || index >= poolsize) return 0; |
787 |
|
return ((nodes[index].reincarnation << poolsizebits) | index) + 1; |
788 |
|
} |
789 |
|
|
790 |
|
/** |
791 |
|
* Overridden convenience method, behaves like the method above. |
792 |
|
*/ |
793 |
|
pool_element_id_t getID(const Iterator& it) const { |
794 |
|
return getID(&*it); |
795 |
|
} |
796 |
|
|
797 |
|
/** |
798 |
|
* Returns an Iterator object of the Pool data member reflected by the |
799 |
|
* given abstract, unique numeric ID, it returns an invalid Iterator in |
800 |
|
* case the ID is invalid or if the Pool's data element reflected by |
801 |
|
* given ID was at least once released/freed back to the Pool in the |
802 |
|
* meantime. |
803 |
|
* |
804 |
|
* Members are always translated both, from Iterators/pointers to IDs, |
805 |
|
* and from IDs to Iterators/pointers in constant time. |
806 |
|
* |
807 |
|
* You might want to use this alternative approach of referencing Pool |
808 |
|
* members under certain scenarios. For example if you need to expose |
809 |
|
* an ID to the end user and/or if you want to represent an object of |
810 |
|
* this pool by a smaller number instead of a native pointer (i.e. 16 |
811 |
|
* bits vs. 64 bits). You can also detect this way whether the object |
812 |
|
* has already been freed / reallocated from the Pool in the meantime. |
813 |
|
* |
814 |
|
* @param id - unique ID (!= 0) of a Pool's data member |
815 |
|
* @returns Iterator object pointing to Pool's data element, invalid |
816 |
|
* Iterator in case ID was invalid or data element was freed |
817 |
|
*/ |
818 |
|
Iterator fromID(pool_element_id_t id) const { |
819 |
|
//TODO: -1 check here is a relict from older versions of Pool.h, once it is certain that no existing code base is still using -1 for "invalid" Pool elements then this -1 check can be removed |
820 |
|
if (id == 0 || id == -1) return Iterator(); // invalid iterator |
821 |
|
id--; |
822 |
|
const uint bits = poolsizebits; |
823 |
|
uint index = id & ((1 << bits) - 1); |
824 |
|
if (index >= poolsize) return Iterator(); // invalid iterator |
825 |
|
Node* node = &nodes[index]; |
826 |
|
uint reincarnation = id >> bits; |
827 |
|
if (reincarnation != node->reincarnation) return Iterator(); // invalid iterator |
828 |
|
return Iterator(node); |
829 |
|
} |
830 |
|
|
831 |
|
/** |
832 |
|
* Returns an Iterator object for the object pointed by @a obj. This |
833 |
|
* method will check whether the supplied object is actually part of |
834 |
|
* this pool, and if it is not part of this pool an invalid Iterator is |
835 |
|
* returned instead. |
836 |
|
* |
837 |
|
* @param obj - raw pointer to an object managed by this pool |
838 |
|
* @returns Iterator object pointing to the supplied object, invalid |
839 |
|
* Iterator in case object is not part of this pool |
840 |
|
*/ |
841 |
|
Iterator fromPtr(const T* obj) const { |
842 |
|
if (!poolsize) return Iterator(); // invalid iterator |
843 |
|
int index = int( obj - &data[0] ); |
844 |
|
if (index < 0 || index >= poolsize) return Iterator(); // invalid iterator |
845 |
|
return Iterator(&nodes[index]); |
846 |
|
} |
847 |
|
|
848 |
protected: |
protected: |
849 |
// caution: assumes pool (that is freelist) is not empty! |
// caution: assumes pool (that is freelist) is not empty! |
850 |
inline Iterator alloc() { |
inline Iterator alloc() { |
854 |
} |
} |
855 |
|
|
856 |
inline void freeToPool(Iterator itElement) { |
inline void freeToPool(Iterator itElement) { |
857 |
|
itElement.node()->bumpReincarnation(reincarnationbits); |
858 |
freelist.append(itElement); |
freelist.append(itElement); |
859 |
} |
} |
860 |
|
|
861 |
inline void freeToPool(Iterator itFirst, Iterator itLast) { |
inline void freeToPool(Iterator itFirst, Iterator itLast) { |
862 |
|
for (Node* n = itFirst.node(); true; n = n->next) { |
863 |
|
n->bumpReincarnation(reincarnationbits); |
864 |
|
if (n == itLast.node()) break; |
865 |
|
} |
866 |
freelist.append(itFirst, itLast); |
freelist.append(itFirst, itLast); |
867 |
} |
} |
868 |
|
|
877 |
freelist.append(&nodes[i]); |
freelist.append(&nodes[i]); |
878 |
} |
} |
879 |
poolsize = Elements; |
poolsize = Elements; |
880 |
|
poolsizebits = bitsForSize(poolsize + 1); // +1 here just because IDs are always incremented by one (to avoid them ever being zero) |
881 |
|
updateReincarnationBits(); |
882 |
|
} |
883 |
|
|
884 |
|
inline void updateReincarnationBits() { |
885 |
|
reincarnationbits = sizeof(pool_element_id_t) * 8 - poolsizebits - reservedbits; |
886 |
|
} |
887 |
|
|
888 |
|
inline static int bitsForSize(int size) { |
889 |
|
if (!size) return 0; |
890 |
|
size--; |
891 |
|
int bits = 0; |
892 |
|
for (; size > 1; bits += 2, size >>= 2); |
893 |
|
return bits + size; |
894 |
} |
} |
895 |
}; |
}; |
896 |
|
|