Arena that allocates memory in blocks and frees it all at destruction.
Declared in <folly/memory/Arena.h>
template<class Alloc>
class Arena;Memory obtained from allocate() stays alive until the arena is cleared or destroyed; individual deallocations are no-ops. Blocks come from the user-supplied allocator Alloc.
| Name | Description |
|---|---|
Arena [constructor] | Constructors |
~Arena [destructor] | Destroys the arena, freeing every block it owns. |
operator= | Assignment operators |
allocate | Allocates a properly aligned chunk of memory from the arena. |
bytesUsed | Gets the total number of "used" bytes. |
clear | Resets the arena, reusing regular blocks and freeing large ones. |
deallocate | Releases memory back to the arena; this is intentionally a no-op. |
merge | Transfers ownership of all memory allocated from other to this arena. |
totalSize | Gets the total memory used by the arena. |
| Name | Description |
|---|---|
kBlockOverhead | Per-block bookkeeping overhead, in bytes. |
kDefaultMaxAlign | Default maximum alignment, in bytes, honored by allocations. |
kDefaultMinBlockSize | Default minimum size, in bytes, of each regular block. |
kNoSizeLimit | Sentinel value meaning the arena has no total size limit. |
| Name | Description |
|---|---|
SysArena | Arena that uses the system allocator (malloc / free) |