Public Types
- typedef free_list::__mutex_type __mutex_type
- typedef const _Tp * const_pointer
- typedef const _Tp & const_reference
- typedef ptrdiff_t difference_type
- typedef _Tp * pointer
- typedef _Tp & reference
- typedef size_t size_type
- typedef _Tp value_type
Public Member Functions
- bitmap_allocator (const bitmap_allocator &)
- template<typename _Tp1 > bitmap_allocator (const bitmap_allocator< _Tp1 > &) throw ()
- pointer _M_allocate_single_object () throw (std::bad_alloc)
- void _M_deallocate_single_object (pointer __p) throw ()
- pointer address (reference __r) const
- const_pointer address (const_reference __r) const
- pointer allocate (size_type __n)
- pointer allocate (size_type __n, typename bitmap_allocator< void >::const_pointer)
- void construct (pointer __p, const_reference __data)
- template<typename... _Args> void construct (pointer __p, _Args &&...__args)
- void deallocate (pointer __p, size_type __n) throw ()
- void destroy (pointer __p)
- size_type max_size () const throw ()
Private Types
- typedef vector_type::iterator iterator
-
typedef
__detail::__mini_vector
< value_type > vector_type
Private Member Functions
- void _M_clear ()
- size_t * _M_get (size_t __sz) throw (std::bad_alloc)
- void _M_insert (size_t *__addr) throw ()
Detailed Description
Bitmap Allocator, primary template.
Member Function Documentation
| pointer __gnu_cxx::bitmap_allocator::_M_allocate_single_object | ( | ) | throw (std::bad_alloc) [inline] |
Allocates memory for a single object of size sizeof(_Tp).
- Exceptions:
-
std::bad_alloc. If memory can not be allocated.
Complexity: Worst case complexity is O(N), but that is hardly ever hit. If and when this particular case is encountered, the next few cases are guaranteed to have a worst case complexity of O(1)! That's why this function performs very well on average. You can consider this function to have a complexity referred to commonly as: Amortized Constant time.
Definition at line 825 of file bitmap_allocator.h.
References __gnu_cxx::_Bit_scan_forward(), __gnu_cxx::__detail::__bit_allocate(), and __gnu_cxx::__detail::__num_bitmaps().
| void __gnu_cxx::bitmap_allocator::_M_deallocate_single_object | ( | pointer | __p | ) | throw () [inline] |
Deallocates memory that belongs to a single object of size sizeof(_Tp).
Complexity: O(lg(N)), but the worst case is not hit often! This is because containers usually deallocate memory close to each other and this case is handled in O(1) time by the deallocate function.
Definition at line 915 of file bitmap_allocator.h.
References std::__rotate(), __gnu_cxx::__detail::__bit_free(), __gnu_cxx::__detail::__num_bitmaps(), and __gnu_cxx::free_list::_M_insert().
The documentation for this class was generated from the following file:
