Accessors, byLine, input ranges

[Steven Schveighoffer]

On Fri, 29 Jan 2010 11:18:46 -0500, Andrei Alexandrescu  
<SeeWebsiteForEmail at erdani.org> wrote:

> Steven Schveighoffer wrote:
>> On Fri, 29 Jan 2010 10:53:50 -0500, Michel Fortin  
>> <michel.fortin at michelf.com> wrote:
>>
>>> On 2010-01-29 10:49:34 -0500, "Steven Schveighoffer"  
>>> <schveiguy at yahoo.com> said:
>>>
>>>> ugh... much simpler with a true stream-like range that supports what  
>>>> is  natural for streams:
>>>>  for(int i = 0; i < count && !range.empty; i++) {
>>>>     elements ~= range.get();
>>>> }
>>>>  But of course, then this function doesn't work for other range  
>>>> types.  I  decided in that discussion long ago that stream ranges  
>>>> were going to suck.
>>>
>>> You can always define a generic take() like this:
>>>
>>>     E take(R, E)(ref R range) {
>>>         E element = range.front;
>>>         range.popFront();
>>>         return element;
>>>     }
>>>
>>> This will work for any forward range.
>>>
>>  Except stream ranges.  I don't get it...
>
> It should work for stream ranges if front() checks the "filled" flag and  
> eats the next line if false, and popFront clears the "filled" flag.

That actually makes a lot of sense.  I hope this fix goes in.

-Steve