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cache_freelist Class

 

The latest version of this topic can be found at cache_freelist Class.

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

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

Parameters

ParameterDescription
SzThe number of elements in the array to be allocated.
MaxThe max class representing the maximum size of the free list. This can be max_fixed_size, max_none, max_unbounded, or max_variable_size.

The cache_freelist template class 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

cache_freelistConstructs an object of type cache_freelist.

Member Functions

allocateAllocates a block of memory.
deallocateFrees a specified number of objects from storage beginning at a specified position.

Header: <allocators>

Namespace: stdext

Allocates a block of memory.

void *allocate(std::size_t count);

Parameters

ParameterDescription
countThe number of elements in the array to be allocated.

Return Value

A pointer to the allocated object.

Remarks

Constructs an object of type cache_freelist.

cache_freelist();

Remarks

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

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

Parameters

ParameterDescription
ptrA pointer to the first object to be deallocated from storage.
countThe number of objects to be deallocated from storage.

Remarks

<allocators>

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