On 7/16/21 10:52 AM, Dylan Graham wrote:
On Friday, 16 July 2021 at 13:54:36 UTC, vit wrote:
What adventage has record over normal immutable/const class?
In terms of mutability, none.
The duplicate method, however, lets you copy and mutate (once at
duplication) a record without impacting the integrity of the original.
You can do this with an immutable class, but then you have to roll your
own.
Really, it's more a convenience / less typing sort of feature, as it
implements all the common boilerplate for you, which should help with
consistency of code.
What about a UFCS `duplicate` method?
I'm not doubting there are good reasons to define types this way in C#,
but D has pretty good tools when it comes to boilerplate.
I would possibly suggest that instead of a record template that accepts
directives using inline lambdas, etc, just accept a model type and use
udas to adjust the record type.
i.e.:
```d
struct RecModel {
@get_set float y;
@get int x;
auto getDoubleOfX() { return x * 2; }
... // etc
}
alias MyRecord = record!RecModel;
```
I use this kind of thing to great success in my SQL database system.
-Steve
