Casting Pointers?

[Rene Zwanenburg via Digitalmars-d]

On Thursday, 12 May 2016 at 08:41:25 UTC, John Burton wrote:
> Is this legal / valid in D and if not what is the appropriate 
> way to efficiently access data like this?

Phobos / druntime use casts like this as well, but there has been 
some discussion as to whether it should be guaranteed to be 
correct. There are good reasons the C folks disallow it (well, 
performance of course, what else? ^^), and the reasoning applies 
to D as well.

In this case, you can use a union:

union DL
{
	double d;
	long l;
}

auto dl = DL(1.0);
writeln(dl.l);