Re: What's in a empty class?

2015-10-27 Thread TheFlyingFiddle via Digitalmars-d-learn 

On Tuesday, 27 October 2015 at 21:28:31 UTC, Adam D. Ruppe wrote:
On Tuesday, 27 October 2015 at 21:23:45 UTC, TheFlyingFiddle 
wrote:

I can account for the first thing a vtable. But that
should only cover 4bytes. What's in the other 4bytes?


The monitor used for `synchronized`.

(yes, this is something a lot of people want to remove as it is 
rarely all that useful yet you pay the price in all D class 
objects)


I see Thanks.

Re: What's in a empty class?

2015-10-27 Thread Adam D. Ruppe via Digitalmars-d-learn 
On Tuesday, 27 October 2015 at 21:23:45 UTC, TheFlyingFiddle 
wrote:

I can account for the first thing a vtable. But that
should only cover 4bytes. What's in the other 4bytes?


The monitor used for `synchronized`.

(yes, this is something a lot of people want to remove as it is 
rarely all that useful yet you pay the price in all D class 
objects)

What's in a empty class?

2015-10-27 Thread TheFlyingFiddle via Digitalmars-d-learn 

With this code:

class A { }
pragma(msg, __traits(classInstanceSize, A));

I get the output 8 (32-bit).
I can account for the first thing a vtable. But that
should only cover 4bytes. What's in the other 4bytes?