Re: Post-ctor ctor

[Andrei Alexandrescu]

On 8/7/11 1:16 PM, Andrej Mitrovic wrote:

Just throwing an idea..

structs are great since you don't have to make a special constructor
just to initialize its fields. E.g.:

struct Foo
{
     int a;
     int b;
     int c;
     int d;
}

void main()
{
     auto foo = Foo(1, 2, 3, 4);
}

But what if I add an extra couple of fields that have to be
initialized based on only the first 4 fields, and I still want to keep
the same call in the user code?

Just define a mixin and use it:

this(int a, int b, int c, int d) {
  mixin(initFromParameters());
  ...
}

A similar macro could help assignments.


Andrei