rapidjson::MemoryPoolAllocator< BaseAllocator > Class Template Reference

Default memory allocator used by the parser and DOM. More...

#include <allocators.h>

Public Member Functions
	MemoryPoolAllocator (size_t chunkSize=kDefaultChunkCapacity, BaseAllocator *baseAllocator=0)
	Constructor with chunkSize. More...
	MemoryPoolAllocator (void *buffer, size_t size, size_t chunkSize=kDefaultChunkCapacity, BaseAllocator *baseAllocator=0)
	Constructor with user-supplied buffer. More...
	~MemoryPoolAllocator ()
	Destructor. More...
void	Clear ()
	Deallocates all memory chunks, excluding the user-supplied buffer.
size_t	Capacity () const
	Computes the total capacity of allocated memory chunks. More...
size_t	Size () const
	Computes the memory blocks allocated. More...
void *	Malloc (size_t size)
	Allocates a memory block. (concept Allocator)
void *	Realloc (void *originalPtr, size_t originalSize, size_t newSize)
	Resizes a memory block (concept Allocator)

Static Public Member Functions
static void	Free (void *ptr)
	Frees a memory block (concept Allocator)

Static Public Attributes
static const bool	kNeedFree = false
	Tell users that no need to call Free() with this allocator. (concept Allocator)

Detailed Description

template<typename BaseAllocator = CrtAllocator>
class rapidjson::MemoryPoolAllocator< BaseAllocator >

Default memory allocator used by the parser and DOM.

This allocator allocate memory blocks from pre-allocated memory chunks.

It does not free memory blocks. And Realloc() only allocate new memory.

The memory chunks are allocated by BaseAllocator, which is CrtAllocator by default.

User may also supply a buffer as the first chunk.

If the user-buffer is full then additional chunks are allocated by BaseAllocator.

The user-buffer is not deallocated by this allocator.

Template Parameters

BaseAllocator

the allocator type for allocating memory chunks. Default is CrtAllocator.

Note

implements Allocator concept

Constructor & Destructor Documentation

MemoryPoolAllocator() [1/2]

template<typename BaseAllocator = CrtAllocator>

rapidjson::MemoryPoolAllocator< BaseAllocator >::MemoryPoolAllocator ( size_t  chunkSize = kDefaultChunkCapacity, BaseAllocator *  baseAllocator = 0  )

inline

Constructor with chunkSize.

Parameters

chunkSize	The size of memory chunk. The default is kDefaultChunkSize.
baseAllocator	The allocator for allocating memory chunks.

MemoryPoolAllocator() [2/2]

template<typename BaseAllocator = CrtAllocator>

rapidjson::MemoryPoolAllocator< BaseAllocator >::MemoryPoolAllocator ( void *  buffer, size_t  size, size_t  chunkSize = kDefaultChunkCapacity, BaseAllocator *  baseAllocator = 0  )

inline

Constructor with user-supplied buffer.

The user buffer will be used firstly. When it is full, memory pool allocates new chunk with chunk size.

The user buffer will not be deallocated when this allocator is destructed.

Parameters

buffer	User supplied buffer.
size	Size of the buffer in bytes. It must at least larger than sizeof(ChunkHeader).
chunkSize	The size of memory chunk. The default is kDefaultChunkSize.
baseAllocator	The allocator for allocating memory chunks.

~MemoryPoolAllocator()

template<typename BaseAllocator = CrtAllocator>

rapidjson::MemoryPoolAllocator< BaseAllocator >::~MemoryPoolAllocator ( )

inline

Destructor.

This deallocates all memory chunks, excluding the user-supplied buffer.

Member Function Documentation

Capacity()

template<typename BaseAllocator = CrtAllocator>

size_t rapidjson::MemoryPoolAllocator< BaseAllocator >::Capacity ( ) const

inline

Computes the total capacity of allocated memory chunks.

Returns

total capacity in bytes.

Size()

template<typename BaseAllocator = CrtAllocator>

size_t rapidjson::MemoryPoolAllocator< BaseAllocator >::Size ( ) const

inline

Computes the memory blocks allocated.

Returns

total used bytes.

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The documentation for this class was generated from the following file:

• include/rapidjson/allocators.h