On Thu, 08 May 2014 13:21:07 -0400, Yuriy <yuriy.gluk...@gmail.com> wrote:
On Thursday, 8 May 2014 at 14:57:37 UTC, Steven Schveighoffer wrote:The de-facto minimum size of a class is 16 bytes, due to the minimum block size of the heap.8 bytes vtbl pointer on 64-bit systems would still allocate into 16-byte blocks.-SteveYes, but still the question remains open for non-empty classes (e.g. want to use a 64bit useful payload), and for _emplacing_ any classes anywhere (e.g. on stack).
To what end? What are you trying to save?
Afaiu, there's no solution except for declaring extern(C++) (yes, i know, it's a hack), and it will not work, if a class is templated on something which can not be cpp-mangled. So the question is: is there any reason why this is not possible? I mean, maybe this question was closed long before.
It would not be derived from Object, which has the field. In other words, this would crash:
synchronized(cast(Object)obj) { ... }
Also, do shared classes actually require monitors?
Perhaps you meant unshared classes? No, they don't, but a monitor is only allocated on demand, so you don't have to worry about it.
However, note that it is perfectly acceptable to cast to and from shared as long as you guarantee the uniqueness of the reference. If the monitor is not present, this can cause problems.
-Steve
