Memory manager that dispenses heterogeneous blocks from an external buffer.
Declared in <bdlma_buffermanager.h>
class BufferManager;This class implements a buffer manager that dispenses heterogeneous blocks of memory (of varying, user-specified sizes) from an external buffer whose address and size are optionally supplied at construction. If an allocation request exceeds the remaining free memory space in the external buffer, the allocation request returns 0 if allocate is used, or results in undefined behavior if allocateRaw is used. Note that in no event will the buffer manager attempt to deallocate the external buffer.
| Name | Description |
|---|---|
BufferManager [constructor] | Constructors |
~BufferManager [destructor] | Destroy this buffer manager. |
alignmentStrategy | Return the alignment strategy passed to this object at construction. |
allocate | Return a contiguous block of memory of the specified size (in bytes), or 0 on failure. |
allocateRaw | Return a contiguous block of memory of the specified size (in bytes). |
buffer | Return an address providing modifiable access to the buffer currently managed by this object, or 0 if this object currently manages no buffer. |
bufferSize | Return the size (in bytes) of the buffer currently managed by this object, or 0 if this object currently manages no buffer. |
calculateAlignmentOffsetFromSize | Return the alignment offset for address for an allocation of size. |
deleteObject | Destroy the specified object. |
deleteObjectRaw | Destroy the specified object. Note that memory associated with object is not deallocated because there is no deallocate method in BufferManager. |
expand | Expand the allocation at address to include the remaining buffer. |
hasSufficientCapacity | Return whether the buffer can allocate a block of the specified size. |
release | Release all memory currently allocated through this buffer manager. |
replaceBuffer | Replace the managed buffer with newBuffer of newBufferSize. |
reset | Reset this buffer manager to its default-constructed state. |
truncate | Truncate the allocation at address from originalSize to newSize. |