For those who don't know it: I'm talking here about the undocumented(?) new class { } - feature. I.e. You can do the following:

class Foo {
 int bar() { return 5; }
}

auto x = new class Foo {
  int bar() { return 6; }
  int foo() { return 7; }
};

then x will hold an object of a class derived from Foo.


Say I have a contstruct like this:

class Dispatcher {
 // ...
}

class Base {
  Dispatcher dispatcher;
}

class Something : Base {
  this() {
    dispatcher = new class Dispatcher {
      void foo() {
        // XXX
      }
    };
  }
} // class Something


Now I want to access the "outer this" i.e. the instance of Something at
the line I marked with XXX. Is this possible without a temporary
variable that "renames" the outer this?
(simply 'this' would refer to the inner, i.e. the object foo is a
method of.)

Henning

-- 
GPG Public Key: http://keyserver.ganneff.de:11371/pks/lookup?op=get&search=0xDDD6D36D41911851 Fingerprint: 344F 4072 F038 BB9E B35D  E6AB DDD6 D36D 4191 1851

Henning Hasemann wrote:
> For those who don't know it: I'm talking here about the undocumented(?)
> new class { } - feature. I.e. You can do the following:
> 
> class Foo {
>  int bar() { return 5; }
> }
> 
> auto x = new class Foo {
>   int bar() { return 6; }
>   int foo() { return 7; }
> };
> 
> then x will hold an object of a class derived from Foo.
> 
> 
> Say I have a contstruct like this:
> 
> class Dispatcher {
>  // ...
> }
> 
> class Base {
>   Dispatcher dispatcher;
> }
> 
> class Something : Base {
>   this() {
>     dispatcher = new class Dispatcher {
>       void foo() {
>         // XXX
>       }
>     };
>   }
> } // class Something
> 
> 
> Now I want to access the "outer this" i.e. the instance of Something at
> the line I marked with XXX. Is this possible without a temporary
> variable that "renames" the outer this?
> (simply 'this' would refer to the inner, i.e. the object foo is a
> method of.)
> 
> Henning
> 

Nested class instances have an .outer property, for example:

class Something : Base {
  this() {
    dispatcher = new class Dispatcher {
      void foo() {
        this.outer.bar();
      }
    };
  }
  void bar() {}
}

-- 
Kirk McDonald
http://kirkmcdonald.blogspot.com
Pyd: Connecting D and Python
http://pyd.dsource.org

"Henning Hasemann" <hhasemann@web.de> wrote in message news:20070618214023.53eb5058@amee...
>
> For those who don't know it: I'm talking here about the undocumented(?)
> new class { } - feature.

http://www.digitalmars.com/d/class.html#anonymous

:)

Am Mon, 18 Jun 2007 21:40:23 +0200
schrieb Henning Hasemann <hhasemann@web.de>:


Thanks to both answerers, that was exactly what I looked for. And sorry for my blindness ,-)

Henning

-- 
GPG Public Key: http://keyserver.ganneff.de:11371/pks/lookup?op=get&search=0xDDD6D36D41911851 Fingerprint: 344F 4072 F038 BB9E B35D  E6AB DDD6 D36D 4191 1851