| … | |
… | |
| 53 | #include <glib.h> |
53 | #include <glib.h> |
| 54 | |
54 | |
| 55 | #include <shstr.h> |
55 | #include <shstr.h> |
| 56 | #include <traits.h> |
56 | #include <traits.h> |
| 57 | |
57 | |
| 58 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
58 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 59 | #define auto(var,expr) decltype(expr) var = (expr) |
59 | #define auto(var,expr) decltype(expr) var = (expr) |
| 60 | |
60 | |
| 61 | // very ugly macro that basicaly declares and initialises a variable |
61 | // very ugly macro that basicaly declares and initialises a variable |
| 62 | // that is in scope for the next statement only |
62 | // that is in scope for the next statement only |
| 63 | // works only for stuff that can be assigned 0 and converts to false |
63 | // works only for stuff that can be assigned 0 and converts to false |
| … | |
… | |
| 405 | { |
405 | { |
| 406 | return !strcmp (a, b); |
406 | return !strcmp (a, b); |
| 407 | } |
407 | } |
| 408 | }; |
408 | }; |
| 409 | |
409 | |
|
|
410 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
411 | // the elements, making insret/remove O(1) instead of O(n). |
|
|
412 | // |
|
|
413 | // NOTE: only some forms of erase/insert are available |
| 410 | template<class T> |
414 | template<class T> |
| 411 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
415 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
| 412 | { |
416 | { |
| 413 | typedef typename unordered_vector::iterator iterator; |
417 | typedef typename unordered_vector::iterator iterator; |
| 414 | |
418 | |
| … | |
… | |
| 424 | { |
428 | { |
| 425 | erase ((unsigned int )(i - this->begin ())); |
429 | erase ((unsigned int )(i - this->begin ())); |
| 426 | } |
430 | } |
| 427 | }; |
431 | }; |
| 428 | |
432 | |
|
|
433 | // This container blends advantages of linked lists |
|
|
434 | // (efficiency) with vectors (random access) by |
|
|
435 | // by using an unordered vector and storing the vector |
|
|
436 | // index inside the object. |
|
|
437 | // |
|
|
438 | // + memory-efficient on most 64 bit archs |
|
|
439 | // + O(1) insert/remove |
|
|
440 | // + free unique (but varying) id for inserted objects |
|
|
441 | // + cache-friendly iteration |
|
|
442 | // - only works for pointers to structs |
|
|
443 | // |
|
|
444 | // NOTE: only some forms of erase/insert are available |
| 429 | template<class T, int T::* index> |
445 | template<class T, int T::* index> |
| 430 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
446 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
| 431 | { |
447 | { |
| 432 | typedef typename object_vector::iterator iterator; |
448 | typedef typename object_vector::iterator iterator; |
| 433 | |
449 | |
| … | |
… | |
| 443 | : this->end (); |
459 | : this->end (); |
| 444 | } |
460 | } |
| 445 | |
461 | |
| 446 | void insert (T *obj) |
462 | void insert (T *obj) |
| 447 | { |
463 | { |
| 448 | assert (!(obj->*index)); |
|
|
| 449 | push_back (obj); |
464 | push_back (obj); |
| 450 | obj->*index = this->size (); |
465 | obj->*index = this->size (); |
| 451 | } |
466 | } |
| 452 | |
467 | |
| 453 | void insert (T &obj) |
468 | void insert (T &obj) |
| … | |
… | |
| 455 | insert (&obj); |
470 | insert (&obj); |
| 456 | } |
471 | } |
| 457 | |
472 | |
| 458 | void erase (T *obj) |
473 | void erase (T *obj) |
| 459 | { |
474 | { |
| 460 | assert (obj->*index); |
|
|
| 461 | unsigned int pos = obj->*index; |
475 | unsigned int pos = obj->*index; |
| 462 | obj->*index = 0; |
476 | obj->*index = 0; |
| 463 | |
477 | |
| 464 | if (pos < this->size ()) |
478 | if (pos < this->size ()) |
| 465 | { |
479 | { |
