Pointer across threads

[thedeemon via Digitalmars-d-learn]

On Tuesday, 4 November 2014 at 14:36:19 UTC, Chris wrote:
> I'm still curious, though, how D handles this internally, 
> because data.data is still mutable while the other reference to 
> the same address (tmp) is not. What if I change data.data while 
> the other thread is being executed?

"immutable" is part of the static type system, it's a label that 
only exists and makes sense at compile time, for compiler and the 
programmer. Casting a mutable data pointer to immutable data 
pointer is a no-op, just a copy of pointer. Address stays the 
same, data stays the same. So if you mutate the data it will lead 
to "immutable" data being changed just because it's not really 
immutable, you've just fooled yourself when doing the cast.