22 Sep
2009
22 Sep
'09
2:46 p.m.
On Tuesday 22 September 2009 12:32:35 am Mike Kaplinskiy wrote:
It actually does not dereference anything.
Does the C standard specify that taking the address of a struct member being dereferenced doesn't actually cause a dereference, instead just offsetting? Doing foo-> is identical to (*foo)., so dmW->dmFormName is the same as &(*dmW).dmFormName, which does technically cause a dereference, followed by taking the address of the field.
However, since GCC will remove deadcode and it's simple to see the dereference isn't needed, it just optimizes it away. I wouldn't even be surprised if this behavior is guaranteed by GCC with no optimizations enabled.. but I'm not so sure that it's guaranteed by the C standard. Is it?