Any way to set len and ptr in dyn arrays?

[nobody]

James Dunne wrote:
> This is very interesting and all, but why would you do such a thing?
> 
> Is the .length property on the dynamic array just not cuttin' it for you?
> 

No it is not. The whole raison d'etre for that array is to give 
me access to the data in buf. From my reading of the docs it 
looks like any case in which the length increases then this 
array can be copied and might not point to the data in buf 
anymore. So now if I tried to save changes to buf by passing it 
to the std.file.write method it would look like nothing happened.