Memory Allocation

Article
07/11/2012

Use these routines to allocate, free, and reallocate memory.

Memory-Allocation Routines

Routine	Use	.NET Framework equivalent
_alloca, _malloca	Allocate memory from stack	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
calloc	Allocate storage for array, initializing every byte in allocated block to 0	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_calloc_dbg	Debug version of calloc; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
operator delete	Free allocated block	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
operator delete[]	Free allocated block	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_expand	Expand or shrink block of memory without moving it	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_expand_dbg	Debug version of _expand; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
free	Free allocated block	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_free_dbg	Debug version of free; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_freea	Free allocated block from stack	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_get_heap_handle	Get Win32 HANDLE of the CRT heap.	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_get_sbh_threshold	Return the upper limit for the size of a memory allocation that will be supported by the small-block heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_heapadd	Add memory to heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_heapchk	Check heap for consistency	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_heapmin	Release unused memory in heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_heapset	Fill free heap entries with specified value	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_heapwalk	Return information about each entry in heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
malloc	Allocate block of memory from heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_malloc_dbg	Debug version of malloc; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_msize	Return size of allocated block	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_msize_dbg	Debug version of _msize; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
new	Allocate block of memory from heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
new[]	Allocate block of memory from heap	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_query_new_handler	Return address of current new handler routine as set by _set_new_handler	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_query_new_mode	Return integer indicating new handler mode set by _set_new_mode for malloc	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
realloc	Reallocate block to new size	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_realloc_dbg	Debug version of realloc; only available in the debug versions of the run-time libraries	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_set_new_handler	Enable error-handling mechanism when new operator fails (to allocate memory) and enable compilation of Standard Template Libraries (STL)	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.
_set_new_mode	Set new handler mode for malloc	Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

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Memory Allocation

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