Accessors, byLine, input ranges

[Andrei Alexandrescu]

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.

Andrei