Re: Alias variable from another class

[Rene Zwanenburg via Digitalmars-d-learn]

On Tuesday, 13 December 2016 at 19:13:24 UTC, Begah wrote:

Any ideas?


Closest you can get is wrapping it in a property. If you need to 
do this often you may be able to generate them, check the recent 
"Getters/Setters generator" thread in Announce for some 
inspiration.

Re: Alias variable from another class

[ketmar via Digitalmars-d-learn]

On Tuesday, 13 December 2016 at 19:13:24 UTC, Begah wrote:

Any ideas?


you can't.

Re: Alias variable from another class

[Ali via Digitalmars-d-learn]

I guess it's because you're accessing a member of _1 from inside 
a scope of _2 where nothing has been constructed yet? Someone 
more familiar with D would probably have a better answer on this 
part. I'm quite new :)


But a work around would be

class _2 {
  _1 instance;

  auto twelve() @property {
  return instance.i;
  }

  this() {
  instance = new _1(12);
  }
  }

Alias variable from another class

[Begah via Digitalmars-d-learn]

I made a little program to illustrate my confusion :

  import std.stdio;

  class _1 {
  int i;

  this(int n) {
  i = n;
  }
  }

  class _2 {
  _1 instance;

  alias twelve = instance.i;

  this() {
  instance = new _1(12);
  }
  }

  void main() {
  _2 two = new _2();
  writeln(two.instance.i);
  writeln(two.twelve);
  }

What i tried to do is create an alias in class _2 of a variable 
in class _1.

What i would like is :
  two.twelve
to extends to:
  two.instance.i
But the compiler complains it cannot find "this" :
  Error: need 'this' for 'i' of type 'int'

Any ideas?