Re: Good idea or gimmick: Go-style OO-programming in C++ ?

From:

ram@zedat.fu-berlin.de (Stefan Ram)

Newsgroups:

comp.lang.c++

Date:

28 Feb 2013 12:09:30 GMT

Message-ID:

<interfaces-20130228130726@ram.dialup.fu-berlin.de>

?? Tiib <ootiib@hot.ee> writes:

No slightest bit of code. No way to add checks that verify that the
caller followed contract (preconditions) and if implementer
fulfilled it (post-conditions).

  If someone wants to add such code, there are multiple ways.
  For example, to use an abstract class instead of an interface.

  To complain that interfaces are not intended to contain such
  code is like to complain that a cup of coffee does not
  contain any food, so one cannot eat it if one is hungry.
  When one wants to eat something, one is free to order this in
  addition or instead of coffee in the first place.

  (To validate value constraints, one can also add annotations
  to a bean. See:

http://docs.oracle.com/javaee/6/tutorial/doc/gircz.html

  .) There even are tricks to add implementations to an interface
  in Java, IIRC:

interface A
{ java.lang.Runnable r = new java.lang.Runnable()
  { public void run(){ java.lang.System.out.println( "A" ); }}; }

public class Main
{ public static void main( final java.lang.String args[] )
  { A.r.run(); }}

  .