Should a parser type be a struct or class?

[user1234]

On Wednesday, 17 June 2020 at 11:50:27 UTC, Per Nordlöw wrote:
> Should a range-compliant aggregate type realizing a parser be 
> encoded as a struct or class? In dmd `Lexer` and `Parser` are 
> both classes.
>
> In general how should I reason about whether an aggregate type 
> should be encoded as a struct or class?

You have the example of libdparse that shows that using a class 
can be a good idea [1] [2].
For DCD, the parser overrides a few thing because otherwise 
completion does not work properly or has scope issues. But TBH 
there's not many reasons to use a class otherwise.

[1] 
https://github.com/dlang-community/dsymbol/blob/master/src/dsymbol/conversion/package.d#L102
[2] 
https://github.com/dlang-community/dsymbol/blob/master/src/dsymbol/conversion/package.d#L138