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
template<typename _Tp>
class __gnu_cxx::bitmap_allocator< _Tp >
Bitmap Allocator, primary template.
Definition at line 667 of file bitmap_allocator.h.
Member Function Documentation
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Allocates memory for a single object of size sizeof(_Tp).
- Exceptions
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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::__detail::__bit_allocate(), __gnu_cxx::__detail::__num_bitmaps(), and __gnu_cxx::_Bit_scan_forward().
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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 __gnu_cxx::__detail::__bit_free(), __gnu_cxx::__detail::__num_bitmaps(), std::__rotate(), and __gnu_cxx::free_list::_M_insert().
The documentation for this class was generated from the following file:
