getNext

[Steven Schveighoffer]

On Mon, 09 Jul 2012 12:17:49 -0400, Mehrdad <wfunction at hotmail.com> wrote:

> On Monday, 9 July 2012 at 16:06:57 UTC, Timon Gehr wrote:
>>
>> Consider the possibility that this electrical engineer might be a  
>> plumber as well.
>
> Yes, so if you expect him to be, then you should ask him "are you a  
> plumber?" (i.e. output range?)
>
>
> But what you're asking him right now is, "hey, can you do clear this  
> pipe for me with copper wires??" which is downright silly. Being able to  
> write to an output range does NOT require you to have 'ref' members. The  
> only thing 'ref' ever buys you is performance, not any new capabilities.  
> Depending on it doesn't make sense.

import std.range;

struct inputrange
{
     int x;
     @property ref int front() { return x;}
     void popFront() {}
     enum empty = false;
}

static assert(isOutputRange!(inputrange, int));

-Steve