• Walter (25/27) Apr 23 2005 This was originally on comp.lang.c++.moderated:
• TechnoZeus (3/25) Apr 24 2005 Cool! Thanks for pointing this out. :)

"Walter" <newshound digitalmars.com> writes:

This was originally on comp.lang.c++.moderated:

"Robert Kindred" <RKindred SwRI.edu> wrote in message
news:116a3fter9qeq07 corp.supernews.com...
 I know of no other language [besides C++] capable of the Curiously
 Recurring Template Pattern (Leda does not count).

Here's the wiki entry on the CRTP:

http://c2.com/cgi/wiki?CuriouslyRecurringTemplate

and the D Programming Language implementation of it:

class ArithmeticType(T)
{
    T opAdd(T other)
    {
        T result = new T(this);
        result += other;
        return result;
    }
}

class Quaternion: ArithmeticType!(Quaternion)
{
    this() { }
    this(ArithmeticType!(Quaternion) t) { }

    Quaternion opAddAssign(Quaternion other)
    {
         // etc.
    }
}

So now there are two languages that can do the CRTP <g>.

"TechnoZeus" <TechnoZeus PeoplePC.com> writes:

"Walter" <newshound digitalmars.com> wrote in message
news:d4f1o0$2s4n$1 digitaldaemon.com...
 This was originally on comp.lang.c++.moderated:

*snip*
 http://c2.com/cgi/wiki?CuriouslyRecurringTemplate

 and the D Programming Language implementation of it:

 class ArithmeticType(T)
 {
     T opAdd(T other)
     {
         T result = new T(this);
         result += other;
         return result;
     }
 }

 class Quaternion: ArithmeticType!(Quaternion)
 {
     this() { }
     this(ArithmeticType!(Quaternion) t) { }

     Quaternion opAddAssign(Quaternion other)
     {
          // etc.
     }
 }

 So now there are two languages that can do the CRTP <g>.

Cool!  Thanks for pointing this out.  :)