On 6/13/15 6:07 PM, deadalnix wrote:
On Saturday, 13 June 2015 at 11:32:20 UTC, rsw0x wrote:
http://dlang.org/garbage.html
Do not take advantage of alignment of pointers to store bit flags in
the low order bits:
p = cast(void*)(cast(int)p | 1); // error: undefined behavior
if this restriction is actually imposed - why does
std.bitmanip.tagged{ClassRef,Pointer} even exist?
That seems like an arbitrary limitation. This will create an interior
pointer, which the GC needs to recognize anyway.
The doc need to be updated.
void *x = new int;
ptr += 1;
Is this illegal? If not, then why is the above illegal? If so, thousands
of lines of code are in violation -- any kind of serialization library
for example.
It's exactly the same thing. We can probably change taggedPointer to do
this instead, if it's such a big deal. We can change it to a void
pointer, and only cast it to T* when retrieving the real pointer.
But it seems kind of silly to outlaw the obvious implementation. I think
we should revert the warning and fix the docs.
-Steve
