cache_chunklist Class

 

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

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

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

template <std::size_t Sz, std::size_t Nelts = 20>  
class cache_chunklist

Parameters

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

This template class uses operator new to allocate chunks of raw memory, suballocating blocks to allocate storage for a memory block when needed; it stores deallocated memory blocks in a separate free list for each chunk, and uses operator delete to deallocate a chunk when none of its memory blocks is in use.

Each memory block holds Sz bytes of usable memory and a pointer to the chunk that it belongs to. Each chunk holds Nelts memory blocks, three pointers, an int and the data that operator new and operator delete require.

Constructors

cache_chunklistConstructs an object of type cache_chunklist.

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_chunklist.

cache_chunklist();

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>

Show: