Change representation of dynamic arrays?

[0ffh]

Daniel Keep wrote:
> You say you've measured the performance of loops using this, but what
> about slicing code?  I know that I use a lot of [lower..$-something]
> style code; how much slower does this become?  Once I'm not so busy, I
> might try to work out the proportion of foreach to $ slicing in my code. :P

I guess we go from changing one pointer and a size_t to changing two
pointers, I can't see a lot of space for that being slower than now.

Consider:
   wchar[] str="this is a test";
   int s=10; // slice start
   int e=14; // slice end
   tst=s[s..e];
Old array:
   tst.ptr=str.ptr+s*wchar.sizeof;
   tst.len=e-s;
New array:
   tst.start=str.start+s*wchar.sizeof;
   tst.end=str.start+e*wchar.sizeof;

Regards, Frank