__gnu_cxx::bitmap_allocator

__gnu_cxx::bitmap_allocator< _Tp > Class Template Reference

#include <bitmap_allocator.h>

Inheritance diagram for __gnu_cxx::bitmap_allocator< _Tp >:

__gnu_cxx::free_list List of all members.

Public Types

typedef std::size_t size_type
typedef std::ptrdiff_t difference_type
typedef _Tp * pointer
typedef const _Tp * const_pointer
typedef _Tp & reference
typedef const _Tp & const_reference
typedef _Tp value_type

Public Member Functions

pointer _M_allocate_single_object () throw (std::bad_alloc)
 Allocates memory for a single object of size sizeof(_Tp).
void _M_deallocate_single_object (pointer __p) throw ()
 Deallocates memory that belongs to a single object of size sizeof(_Tp).
 bitmap_allocator () throw ()
 bitmap_allocator (const bitmap_allocator &)
template<typename _Tp1>
 bitmap_allocator (const bitmap_allocator< _Tp1 > &) throw ()
 ~bitmap_allocator () throw ()
pointer allocate (size_type __n)
pointer allocate (size_type __n, typename bitmap_allocator< void >::const_pointer)
void deallocate (pointer __p, size_type __n) throw ()
pointer address (reference __r) const
const_pointer address (const_reference __r) const
size_type max_size () const throw ()
void construct (pointer __p, const_reference __data)
void destroy (pointer __p)

Private Types

typedef std::pair< _Alloc_block *,
_Alloc_block * > 		_Block_pair
typedef balloc::__mini_vector<
_Block_pair > 		_BPVector

Private Member Functions

void _S_refill_pool () throw (std::bad_alloc)
 Responsible for exponentially growing the internal memory pool.

Static Private Attributes

static _BPVector _S_mem_blocks
static size_t _S_block_size
static __gnu_cxx::balloc::_Bitmap_counter<
_Alloc_block * > 		_S_last_request
static _BPVector::size_type _S_last_dealloc_index = 0

Classes

struct  _Alloc_block
struct  aligned_size
struct  rebind

Detailed Description

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

Definition at line 865 of file bitmap_allocator.h.

Member Typedef Documentation

template<typename _Tp>
typedef std::pair<_Alloc_block*, _Alloc_block*> __gnu_cxx::bitmap_allocator< _Tp >::_Block_pair [private]

Definition at line 899 of file bitmap_allocator.h.

template<typename _Tp>
typedef balloc::__mini_vector<_Block_pair> __gnu_cxx::bitmap_allocator< _Tp >::_BPVector [private]

Definition at line 902 of file bitmap_allocator.h.

template<typename _Tp>
typedef const _Tp* __gnu_cxx::bitmap_allocator< _Tp >::const_pointer

Definition at line 871 of file bitmap_allocator.h.

template<typename _Tp>
typedef const _Tp& __gnu_cxx::bitmap_allocator< _Tp >::const_reference

Definition at line 873 of file bitmap_allocator.h.

template<typename _Tp>
typedef std::ptrdiff_t __gnu_cxx::bitmap_allocator< _Tp >::difference_type

Definition at line 869 of file bitmap_allocator.h.

template<typename _Tp>
typedef _Tp* __gnu_cxx::bitmap_allocator< _Tp >::pointer

Definition at line 870 of file bitmap_allocator.h.

template<typename _Tp>
typedef _Tp& __gnu_cxx::bitmap_allocator< _Tp >::reference

Definition at line 872 of file bitmap_allocator.h.

template<typename _Tp>
typedef std::size_t __gnu_cxx::bitmap_allocator< _Tp >::size_type

Definition at line 868 of file bitmap_allocator.h.

template<typename _Tp>
typedef _Tp __gnu_cxx::bitmap_allocator< _Tp >::value_type

Reimplemented from __gnu_cxx::free_list.

Definition at line 874 of file bitmap_allocator.h.

Constructor & Destructor Documentation

template<typename _Tp>
__gnu_cxx::bitmap_allocator< _Tp >::bitmap_allocator (  )  throw () [inline]

Definition at line 1188 of file bitmap_allocator.h.

template<typename _Tp>
__gnu_cxx::bitmap_allocator< _Tp >::bitmap_allocator ( const bitmap_allocator< _Tp > &   )  [inline]

Definition at line 1191 of file bitmap_allocator.h.

template<typename _Tp>
template<typename _Tp1>
__gnu_cxx::bitmap_allocator< _Tp >::bitmap_allocator ( const bitmap_allocator< _Tp1 > &   )  throw () [inline]

Definition at line 1195 of file bitmap_allocator.h.

template<typename _Tp>
__gnu_cxx::bitmap_allocator< _Tp >::~bitmap_allocator (  )  throw () [inline]

Definition at line 1198 of file bitmap_allocator.h.

Member Function Documentation

template<typename _Tp>
pointer __gnu_cxx::bitmap_allocator< _Tp >::_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 999 of file bitmap_allocator.h.

References __gnu_cxx::balloc::__bit_allocate(), __gnu_cxx::balloc::__find_if(), __gnu_cxx::balloc::__num_bitmaps(), __gnu_cxx::_Bit_scan_forward(), __gnu_cxx::bitmap_allocator< _Tp >::_S_last_request, __gnu_cxx::bitmap_allocator< _Tp >::_S_mem_blocks, __gnu_cxx::bitmap_allocator< _Tp >::_S_refill_pool(), __gnu_cxx::balloc::__mini_vector< _Tp >::begin(), __gnu_cxx::balloc::__mini_vector< _Tp >::end(), and __gnu_cxx::balloc::__mini_vector< _Tp >::size().

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::allocate().

template<typename _Tp>
void __gnu_cxx::bitmap_allocator< _Tp >::_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 1097 of file bitmap_allocator.h.

References __gnu_cxx::balloc::__bit_free(), __gnu_cxx::balloc::__find_if(), __gnu_cxx::balloc::__num_bitmaps(), std::__rotate(), _BALLOC_ASSERT, __gnu_cxx::free_list::_M_insert(), __gnu_cxx::bitmap_allocator< _Tp >::_S_block_size, __gnu_cxx::bitmap_allocator< _Tp >::_S_last_dealloc_index, __gnu_cxx::bitmap_allocator< _Tp >::_S_last_request, __gnu_cxx::bitmap_allocator< _Tp >::_S_mem_blocks, __gnu_cxx::balloc::__mini_vector< _Tp >::begin(), __gnu_cxx::balloc::bits_per_block, __gnu_cxx::balloc::__mini_vector< _Tp >::end(), __gnu_cxx::balloc::__mini_vector< _Tp >::erase(), and __gnu_cxx::balloc::__mini_vector< _Tp >::size().

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::deallocate().

template<typename _Tp>
void __gnu_cxx::bitmap_allocator< _Tp >::_S_refill_pool (  )  throw (std::bad_alloc) [inline, private]

Responsible for exponentially growing the internal memory pool.

Exceptions:
std::bad_alloc. If memory can not be allocated.
Complexity: O(1), but internally depends upon the complexity of the function free_list::_M_get. The part where the bitmap headers are written has complexity: O(X),where X is the number of blocks of size sizeof(value_type) within the newly acquired block. Having a tight bound.

Definition at line 935 of file bitmap_allocator.h.

References __gnu_cxx::balloc::__num_bitmaps(), __gnu_cxx::free_list::_M_get(), __gnu_cxx::bitmap_allocator< _Tp >::_S_block_size, __gnu_cxx::bitmap_allocator< _Tp >::_S_mem_blocks, __gnu_cxx::balloc::bits_per_block, std::make_pair(), and __gnu_cxx::balloc::__mini_vector< _Tp >::push_back().

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::_M_allocate_single_object().

template<typename _Tp>
const_pointer __gnu_cxx::bitmap_allocator< _Tp >::address ( const_reference  __r  )  const [inline]

Definition at line 1237 of file bitmap_allocator.h.

template<typename _Tp>
pointer __gnu_cxx::bitmap_allocator< _Tp >::address ( reference  __r  )  const [inline]

Definition at line 1233 of file bitmap_allocator.h.

template<typename _Tp>
pointer __gnu_cxx::bitmap_allocator< _Tp >::allocate ( size_type  __n,
typename bitmap_allocator< void >::const_pointer   
) [inline]

Definition at line 1217 of file bitmap_allocator.h.

References __gnu_cxx::bitmap_allocator< _Tp >::allocate().

template<typename _Tp>
pointer __gnu_cxx::bitmap_allocator< _Tp >::allocate ( size_type  __n  )  [inline]

Definition at line 1202 of file bitmap_allocator.h.

References std::__throw_bad_alloc(), and __gnu_cxx::bitmap_allocator< _Tp >::_M_allocate_single_object().

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::allocate().

template<typename _Tp>
void __gnu_cxx::bitmap_allocator< _Tp >::construct ( pointer  __p,
const_reference  __data 
) [inline]

Definition at line 1245 of file bitmap_allocator.h.

template<typename _Tp>
void __gnu_cxx::bitmap_allocator< _Tp >::deallocate ( pointer  __p,
size_type  __n 
) throw () [inline]

Definition at line 1221 of file bitmap_allocator.h.

References __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object(), and operator delete().

template<typename _Tp>
void __gnu_cxx::bitmap_allocator< _Tp >::destroy ( pointer  __p  )  [inline]

Definition at line 1249 of file bitmap_allocator.h.

template<typename _Tp>
size_type __gnu_cxx::bitmap_allocator< _Tp >::max_size (  )  const throw () [inline]

Definition at line 1241 of file bitmap_allocator.h.

Member Data Documentation

template<typename _Tp>
size_t __gnu_cxx::bitmap_allocator< _Tp >::_S_block_size [static, private]

Initial value:

 
    2 * size_t(balloc::bits_per_block)

Definition at line 975 of file bitmap_allocator.h.

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object(), and __gnu_cxx::bitmap_allocator< _Tp >::_S_refill_pool().

template<typename _Tp>
__gnu_cxx::bitmap_allocator< _Tp >::_BPVector::size_type __gnu_cxx::bitmap_allocator< _Tp >::_S_last_dealloc_index = 0 [static, private]

Definition at line 978 of file bitmap_allocator.h.

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object().

template<typename _Tp>
__gnu_cxx::balloc::_Bitmap_counter< typename bitmap_allocator< _Tp >::_Alloc_block * > __gnu_cxx::bitmap_allocator< _Tp >::_S_last_request [static, private]

Definition at line 977 of file bitmap_allocator.h.

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::_M_allocate_single_object(), and __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object().

template<typename _Tp>
bitmap_allocator< _Tp >::_BPVector __gnu_cxx::bitmap_allocator< _Tp >::_S_mem_blocks [static, private]

Definition at line 974 of file bitmap_allocator.h.

Referenced by __gnu_cxx::bitmap_allocator< _Tp >::_M_allocate_single_object(), __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object(), and __gnu_cxx::bitmap_allocator< _Tp >::_S_refill_pool().

The documentation for this class was generated from the following file:
Generated on Tue Feb 2 16:57:52 2010 for GNU C++ STL by  doxygen 1.4.7