Discussion Thread: DIP 1043--Shortened Method Syntax--Final Review

[Nick Treleaven]

On Thursday, 16 June 2022 at 18:56:57 UTC, Paul Backus wrote:
> class Point
> {
>     Color rgba;
>     int x, y;
>     bool hidden;
>
>     mixin(defaultClassConstructor);
> }

It could also allow skipping some fields and support custom 
initialization of those fields using a function literal:

```d
// declare `this(rgba, x, y)`, no `hidden` parameter
mixin defaultClassCtor!("!hidden", { hidden = ...; });
```

The function literal would run after the default assignments. 
Alternatively the parameters to use could be listed:

```d
// declare `this(rgba, x, y)`, no `hidden` parameter
mixin defaultClassCtor!(q{rgba, x, y}, { hidden = ...; });
```

It could skip private fields by default, or include them with a 
flag:

```d
// include private fields
mixin defaultClassCtor!(Yes.privateFields);
```

It could support default arguments:

```d
mixin defaultClassCtor!(q{x = 0, y = 10});
```

And ddoc works for a documented template mixin declaration 
containing a documented constructor.