Should this work?

[John Colvin]

On Friday, 10 January 2014 at 15:19:39 UTC, John Colvin wrote:
> On Friday, 10 January 2014 at 15:05:18 UTC, monarch_dodra wrote:
>> On Friday, 10 January 2014 at 14:31:31 UTC, John Colvin wrote:
>>> or if you want something short and simple, define a free 
>>> function:
>>> auto popFrontRet(R)(ref R range)
>>>   if(isInputRange!R)
>>> {
>>>   range.popFront();
>>>   assert(!range.empty);
>>>   return range.front;
>>> }
>>
>> *Unless* I'm mistaken, he was asking for something that 
>> returns the *popped* element?
>>
>> Re-reading the question, it does kind of sound a bit ambiguous 
>> now.
>
> Woops, of course:
>
> auto popFrontRet(R)(ref R range)
>     if(isInputRange!R)
> {
>     auto tmp = range.front;
>     range.popFront();
> }
>
>
> That also invalidates my second point to do with emptiness.

ugh, today is not my day:

> auto popFrontRet(R)(ref R range)
>     if(isInputRange!R)
> {
>     auto tmp = range.front;
>     range.popFront();
>     return tmp;
> }