Any way to reproduce Dart style constructors?

[ag0aep6g via Digitalmars-d-learn]

On 05/25/2017 12:52 PM, Moritz Maxeiner wrote:
> Be aware, though, that constructors mixed in via a mixin template behave 
> differently with regards to overloading[1].
> 
> [1] https://issues.dlang.org/show_bug.cgi?id=11500

Of course it couldn't be that simple :(

Adam's workaround (`alias __ctor = mixin_thing.__ctor;`) might be 
workable, though.

If that makes the usage too verbose, then a string mixin is the way to 
go, I guess. It's immune to issue 11500, but AutoConstructor isn't as 
nice to look at:

----
static string AutoConstructor(fields ...)()
{
     import std.meta: staticMap;
     import std.traits: fullyQualifiedName;
     import std.string: join;

     enum fqns = staticMap!(fullyQualifiedName, fields);
     auto fields_str = "std.meta.AliasSeq!(" ~ [fqns].join(", ") ~ ")";

     return "
         static import std.meta;
         this(typeof(" ~ fields_str ~ ") args)
         {
             " ~ fields_str ~ " = args;
         }
     ";
}

class Person
{
     string name;
     int age;
     mixin(AutoConstructor!(age, name));
     this(float f) {}
}

void main()
{
     auto p = new Person(42, "Arthur");
     assert(p.age == 42);
     assert(p.name == "Arthur");
}
----

Weird: AutoConstructor needs to be static. Doesn't make sense to me. 
Looks like a compiler bug.