Re: [review][fixed_string] End of review periodapproaching and a plea

From: Peter Dimov (pdimov_at_[hidden])
Date: 2019-12-04 23:43:11

Andrey Semashev wrote:

> I think, fixed_string<0> should be specialized to an empty class. Not that 
> I have a specific use case for fixed_string<0>, but making the class empty 
> in general is useful for EBO and [[non_unique_address]] and e.g. tuples 
> that employ these techniques.

Since values of the same type can't have the same address, you'll be gaining 
at most one byte per tuple even if you put 1089 fixed_string<0>s in it.

Although I suppose tuple<unsigned long, fixed_string<0>> can be 8 bytes 
instead of 16.

My position here is as it has always been; when an actual user asks for this 
and provides an actual use case in which it leads to actual measurable 
benefits, add it. Otherwise, not.