Structs by ref in D2

[Daniel Keep]

Steven Schveighoffer wrote:
> ...
> 
> The issue is possibly with ref.  There are two reasons to use ref, 1 is
> to be able to change the data referenced, 2 is for passing speed.
> 
> 1 is bad for rvalues.  2 should be ok for rvalues.
> 
> If there was a way to signify you only want to use ref for reason 2,
> there would be a good solution.  Most of the time, that's const ref, but
> what you really want is head-const ref, which isn't currently possible. 
> If a struct has references to other values, they might be lvalues, and
> you may want to be able to change them.
> 
> I'm uncertain as to how often you would want to pass an rvalue as a ref
> that had lvalue reference in it, but at the very least, ref const should
> be valid.
> 
> -Steve

In my own code, I usually record my intent by using "inout" for
variables I intend to modify and "ref" for ones which I don't.

Always seemed reasonable to me.