Downgrading ranges

[Lars T. Kyllingstad]

On Sunday, 9 June 2013 at 12:25:45 UTC, Peter Alexander wrote:
> On Sunday, 9 June 2013 at 12:19:47 UTC, Lars T. Kyllingstad 
> wrote:
>> A recent pull request discussion got me thinking:  The ability 
>> to "downgrade" a range to a less featureful one -- wrapping a 
>> random access range in an input range, say -- can be very 
>> useful sometimes, particularly for testing.
>
> "Particularly for testing", or *only* for testing? Is there any 
> other use? (I can't think of any non-contrived use case beyond 
> testing).

I was kind of hoping someone else would come up with examples. :)

Jokes aside, maybe it's only good for testing.  But testing is 
important enough.


> If it's just for testing, would it not be better to just supply 
> a variety of test ranges that implement all combinations of 
> traits?

I'm not sure I see the difference.