__gnu_cxx::bitmap_allocator (3cxx)

Inherits __gnu_cxx::free_list.

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 std::true_type propagate_on_container_move_assignment

typedef _Tp & reference

typedef size_t size_type

typedef _Tp value_type

Public Member Functions

bitmap_allocator (const bitmap_allocator &) noexcept

template<typename _Tp1 > bitmap_allocator (const bitmap_allocator< _Tp1 > &) noexcept

pointer _M_allocate_single_object () throw (std::bad_alloc)

void _M_deallocate_single_object (pointer __p) throw ()

pointer address (reference __r) const noexcept

const_pointer address (const_reference __r) const noexcept

pointer allocate (size_type __n)

pointer allocate (size_type __n, typename bitmap_allocator< void >::const_pointer)

template<typename _Up , typename... _Args> void construct (_Up *__p, _Args &&...__args)

void deallocate (pointer __p, size_type __n) throw ()

template<typename _Up > void destroy (_Up *__p)

size_type max_size () const noexcept

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 ()

template<typename _Tp>class __gnu_cxx::bitmap_allocator< _Tp >

Bitmap Allocator, primary template.

Definition at line 59 of file ext/alloc_traits.h.

template<typename _Tp > pointer \fB__gnu_cxx::bitmap_allocator\fP< _Tp >::_M_allocate_single_object ()std::bad_alloc\fC [inline]\fP

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 827 of file bitmap_allocator.h.

References __gnu_cxx::__detail::__bit_allocate(), __gnu_cxx::__detail::__num_bitmaps(), and __gnu_cxx::_Bit_scan_forward().

template<typename _Tp > void \fB__gnu_cxx::bitmap_allocator\fP< _Tp >::_M_deallocate_single_object (pointer__p)\fC [inline]\fP

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 917 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().

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