NAME

       __gnu_cxx::bitmap_allocator< _Tp > -

SYNOPSIS

       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 _Tp & reference
       typedef size_t size_type
       typedef _Tp value_type

   Public Member Functions
       bitmap_allocator (const bitmap_allocator &) _GLIBCXX_USE_NOEXCEPT
       template<typename _Tp1 > bitmap_allocator (const bitmap_allocator< _Tp1 > &)
           _GLIBCXX_USE_NOEXCEPT
       pointer _M_allocate_single_object ()  throw (std::bad_alloc)
       void _M_deallocate_single_object (pointer __p)  throw ()
       pointer address (reference __r) const _GLIBCXX_NOEXCEPT
       const_pointer address (const_reference __r) const _GLIBCXX_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 _GLIBCXX_USE_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 ()

Detailed Description

   template<typename _Tp>class __gnu_cxx::bitmap_allocator< _Tp >
       Bitmap Allocator, primary template.

       Definition at line 664 of file bitmap_allocator.h.

Member Function Documentation

   template<typename _Tp > pointer __gnu_cxx::bitmap_allocator< _Tp >::_M_allocate_single_object
       ()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 822 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 __gnu_cxx::bitmap_allocator< _Tp >::_M_deallocate_single_object
       (pointer__p) [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 912 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().

Author

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