Allocates memory on a specified alignment boundary.
- [in] size
The size of the requested memory allocation.
- [in] alignment
The alignment value, which must be an integer power of 2.
- [in] offset
The offset into the memory allocation to force the alignment.
_aligned_offset_malloc is useful in situations where alignment is needed on a nested element; for example, if alignment was needed on a nested class.
_aligned_offset_malloc is based on malloc; for more information, see malloc.
_aligned_offset_malloc is marked __declspec(noalias) and __declspec(restrict), meaning that the function is guaranteed not to modify global variables and that the pointer returned is not aliased. For more information, see noalias and restrict.
In Visual C++ 2005, this function sets errno to ENOMEM if the memory allocation failed or if the requested size was greater than _HEAP_MAXREQ. For more information about errno, see errno, _doserrno, _sys_errlist, and _sys_nerr. Also, _aligned_offset_malloc validates its parameters. If alignment is not a power of 2 or if offset is greater than or equal to size and nonzero, this function invokes the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, this function returns NULL and sets errno to EINVAL.