cache_freelist Class

Defines a block allocator that allocates and deallocates memory blocks of a single size.

Syntax

template <std::size_t Sz, class Max>
class cache_freelist

Parameters

Sz
The number of elements in the array to be allocated.

Max
The max class representing the maximum size of the free list. This can be max_fixed_size, max_none, max_unbounded, or max_variable_size.

Remarks

The cache_freelist class template maintains a free list of memory blocks of size Sz. When the free list is full it uses operator delete to deallocate memory blocks. When the free list is empty it uses operator new to allocate new memory blocks. The maximum size of the free list is determined by the class max class passed in the Max parameter.

Each memory block holds Sz bytes of usable memory and the data that operator new and operator delete require.

Constructors

Member functions

Requirements

Header: <allocators>

Namespace: stdext

cache_freelist::allocate

Allocates a block of memory.

void *allocate(std::size_t count);

Parameters

count
The number of elements in the array to be allocated.

Return Value

A pointer to the allocated object.

Remarks

cache_freelist::cache_freelist

Constructs an object of type cache_freelist.

cache_freelist();

Remarks

cache_freelist::deallocate

Frees a specified number of objects from storage beginning at a specified position.

void deallocate(void* ptr, std::size_t count);

Parameters

ptr
A pointer to the first object to be deallocated from storage.

count
The number of objects to be deallocated from storage.

Remarks

See also

<allocators>