Formatted read consumes input

[monarch_dodra]

On Friday, 7 September 2012 at 18:15:00 UTC, Steven Schveighoffer 
wrote:
>
> Well, this does work.  But I don't like that the semantics 
> depend on whether the value is an rvalue or not.
>
> Note that even ranges that are true input ranges (i.e. a file) 
> still consume their data, even as rvalues, there is no way 
> around it.
>
> -Steve

Yes, but that is another issue, it is a "copy" vs "save" semantic 
issue. In theory, one should assume that *even* with pass by 
value, if you want your range to not be consumed, you have to 
call "save". Most ranges are value types, so we tend to forget 
it. std.algorithm had a few save-related bugs like that as a 
matter of fact.

But, contrary to post 1, that is not the actual issue being fixed 
here. It is merely a "compile with unnamed" fix:
formattedRead(file.save, ...)
And now it compiles fine. AND the range is saved. That's it. 
Nothing more, nothing less.

...

That's *if* file provides "save". I do not know much about 
file/stream handling in D, but you get my "save" point.