On Wed, 29 Oct 2014 23:10:10 +0000, dcrepid wrote: > On Wednesday, 29 October 2014 at 21:19:25 UTC, Peter Alexander wrote: >> You need to take a slice of the buffer: >> >> char[] buf = Input[]; >> readln(buf); >> // line now in buf >> >> The reason for this is because you need to know where the string ends. >> If you just passed in Input, how would you know how long the line read >> was? > > Thanks, that solves the problem. I guess what confuses me is that Input > isn't a slice, or at least not implicitly convertible to one. > > Also, I've tried using Input[] directly at the callsite but apparently > that would be an rValue, and D doesn't do rValues yet.
Part of what readln does is *modify* the slice itself, not just the pointed-to characters. In particular it alters the length member so that you know how much input was actually read. This is also why the rvalue reference shouldn't work. Remember, D chose not to repeat C's mistake of relying on null terminators.
