• llee <larry workingwondersus.com> Nov 26 2008
• BCS <ao pathlink.com> Nov 26 2008
• Frank Benoit <keinfarbton googlemail.com> Nov 26 2008

llee <larry workingwondersus.com> writes:

Is it possible to inherit from a nested class from outside of the enclosing
class? For example:

class A
{
     class B { int x; }
}

class C : B
{
     int get () { return x; }
}

BCS <ao pathlink.com> writes:

Reply to llee,

 Is it possible to inherit from a nested class from outside of the
 enclosing class? For example:
 
 class A
 {
 class B { int x; }
 }
 class C : B
 {
 int get () { return x; }
 }


no, sorry

that wouldn't work well anyway as the binding to A might get tricky

OTOH this would be really nice.

class A
{
  class B { int x; }
}

class C : A
{
  class D : B
  {
    int get () { return x; } 
  }
}

Frank Benoit <keinfarbton googlemail.com> writes:

llee schrieb:
 Is it possible to inherit from a nested class from outside of the enclosing
class? For example:
 
 class A
 {
      class B { int x; }
 }
 
 class C : B
 {
      int get () { return x; }
 }
 
 


It should work if B is a static class and you refer to it with A.B .

class A
{
     static class B { int x; }
}

class C : A.B
{
     int get () { return x; }
}

If the class is not static, it has an implicit "this" pointer of the
surrounding class (like in Java), so you cannot create instances of
non-static B, if there is no instance of A. static make B independent of
this reference.