bool empty() const for ranges

Stanislav Blinov stanislav.blinov at
Fri Nov 26 11:26:20 UTC 2021

On Friday, 26 November 2021 at 10:44:10 UTC, Salih Dincer wrote:

> * Is the const essential for ranges?
> * Is it possible to rewind the pointer (```Node * head;```) 
> when my head is empty by the const?

`empty` is not required to be `const`, but it is required to 
yield the same result if called multiple times without mutating 
the range (see In other words, you really ought not to mutate the range in implementation of `empty`, or at least not to the extent you seem to want to.

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