hi,

i would like to hand over some LinkSeq list to some funktions. what would be function header??


void testfunc(???? lists, int bolony) { ....  }

seems like i can't use LinkSeq for the ????.

quest wrote:
> hi,
> 
> i would like to hand over some LinkSeq list to some funktions. what would be function header??
> 
> 
> void testfunc(???? lists, int bolony) { ....  }
> 
> seems like i can't use LinkSeq for the ????.

// Use a list of any type of element
void testfunc(T)(ListSeq!(T) list, int bologna) {}

Unfortunately, you won't be able to put that in an interface.

thank you, that did the trick!

Christopher Wright Wrote:

> quest wrote:
> > hi,
> > 
> > i would like to hand over some LinkSeq list to some funktions. what would be function header??
> > 
> > 
> > void testfunc(???? lists, int bolony) { ....  }
> > 
> > seems like i can't use LinkSeq for the ????.
> 
> // Use a list of any type of element
> void testfunc(T)(ListSeq!(T) list, int bologna) {}
> 
> Unfortunately, you won't be able to put that in an interface.

Christopher Wright wrote:
> quest wrote:
>> hi,
>>
>> i would like to hand over some LinkSeq list to some funktions. what would be function header??
>>
>>
>> void testfunc(???? lists, int bolony) { ....  }
>>
>> seems like i can't use LinkSeq for the ????.
> 
> // Use a list of any type of element
> void testfunc(T)(ListSeq!(T) list, int bologna) {}
> 
> Unfortunately, you won't be able to put that in an interface.

Why not?

interface ResultCollector
{
    void notify(Result r);
    void notify(Seq!(Result) results);
    Seq!(Result) getResults();
}

Robert Fraser wrote:
> Christopher Wright wrote:
>> quest wrote:
>>> hi,
>>>
>>> i would like to hand over some LinkSeq list to some funktions. what would be function header??
>>>
>>>
>>> void testfunc(???? lists, int bolony) { ....  }
>>>
>>> seems like i can't use LinkSeq for the ????.
>>
>> // Use a list of any type of element
>> void testfunc(T)(ListSeq!(T) list, int bologna) {}
>>
>> Unfortunately, you won't be able to put that in an interface.
> 
> Why not?
> 
> interface ResultCollector
> {
>     void notify(Result r);
>     void notify(Seq!(Result) results);
>     Seq!(Result) getResults();
> }

You can't put a template in an interface, just a particular instantiation of one, as you've done there.  Try it with

       void notify(Result)(Seq!(Result) results);

I'm not sure if it's even possible to make that work.  It basically says the interface contains a family of functions and you aren't sure which ones yet.

'Course you *can* make a templated interface:

interface ResultCollector(Result)
{
    void notify(Result r);
    void notify(Seq!(Result) results);
    Seq!(Result) getResults();
}


--bb

Bill Baxter wrote:
> You can't put a template in an interface, just a particular instantiation of one, as you've done there.  Try it with
> 
>        void notify(Result)(Seq!(Result) results);
> 
> I'm not sure if it's even possible to make that work.  It basically says the interface contains a family of functions and you aren't sure which ones yet.

It can be made to work, but not in D, at least not right now. You basically need a very wimpy template -- hereafter a 'generic' -- that doesn't do any compile-time reflection and doesn't call any templates (aside from generics). That would suffice for collections classes, except for requiring a hash function.

In that case, the generic is equivalent to Java's generics: it just saves you from boxing and unboxing.

I'm not sure how useful that is, though.

"Christopher Wright" wrote
> quest wrote:
>> hi,
>>
>> i would like to hand over some LinkSeq list to some funktions. what would be function header??
>>
>>
>> void testfunc(???? lists, int bolony) { ....  }
>>
>> seems like i can't use LinkSeq for the ????.
>
> // Use a list of any type of element
> void testfunc(T)(ListSeq!(T) list, int bologna) {}
>
> Unfortunately, you won't be able to put that in an interface.

you can, but not in the way you are saying:

interface myinterface(T)
{
   void testfunc(ListSeq!(T) list, int balogna);
}

In fact, all the tango containers implement interfaces like this.

-Steve