enum Format

[Nickolay Bukreyev]

On Thursday, 11 January 2024 at 02:21:17 UTC, Walter Bright wrote:
> As for it being a required feature of string interpolation to 
> do this processing at compile time, that's a nice feature, not 
> a must have.

Importance of the ability to do processing at compile time was 
stated by:
* Alexandru 
([here](https://forum.dlang.org/post/yxrqncmaiyfmhxnvzgil@forum.dlang.org) and [here](https://forum.dlang.org/post/yqwxvjnvqaahhshrfohy@forum.dlang.org)),
* Timon 
([here](https://forum.dlang.org/post/unjfb9$1ku5$1@digitalmars.com)),
* Paolo 
([here](https://forum.dlang.org/post/rhpblxrebibhpnfxfihv@forum.dlang.org) and [here](https://forum.dlang.org/post/ajeqtckcwawuvtusbvxb@forum.dlang.org)),
* Steven 
([here](https://forum.dlang.org/post/ilituyhcqipsqktqmfor@forum.dlang.org)).

> The enum proposal is to obviate the requirement for a header 
> and footer template, which is a big improvement.

Header and footer are not templates; `InterpolatedLiteral` and 
`InterpolatedExpression` are. Yes, the latter two can be replaced 
by enums iff it becomes possible to pass arbitrary expressions to 
alias parameters. And I agree it would be a big improvement.

> Structs with no fields have a size of 1 byte for D and C++ 
> structs, and 0 or 4 for C structs (depending on the target).

Yes, I mistakenly wrote, _zero-sized_, when I meant, _empty_.