Re: Synchronized methods in D2

[Jacob Carlborg]

On 2010-09-04 21:06, Era Scarecrow wrote:

I'm currently porting a D1 code base to D2 which has the
following class
hierarchy:

interface Map
{
       void clear ();
}

class Hashtable : Map
{
      synchronized void clear () {};
}

class HashMap : Map
{
      void clear () {};
}

When I compiler the code I get an error about the "clear"
method in
Hashtable not being covariant with the "clear" method in
Map. Any
suggestions how I could solve this, preferable working in
D1 as well?

--
/Jacob Carlborg

   I remember reading about this; The signatures have to match EXACTLY for it 
to work. The interface is a declaration of a contract, of what it expects. If a 
part of the contract is broken, an error tells you where to fix it.

  Even if technically it would be compatible, the compiler and type checking 
won't allow it. So either synchronize your interface as well, or drop it from 
the implementation.

  A third option, is to match the declaration, and have a private function that 
is synchronized that is called from clear. At least, i believe this is right.

  Era

If a private method works then that might be the solution, thanks.


--
/Jacob Carlborg