• quest <quest questx.com> Feb 27 2008
• Christopher Wright <dhasenan gmail.com> Feb 27 2008
• quest <quest <quest questx.com>> Feb 27 2008
• Robert Fraser <fraserofthenight gmail.com> Feb 27 2008
• Bill Baxter <dnewsgroup billbaxter.com> Feb 27 2008
• Christopher Wright <dhasenan gmail.com> Feb 27 2008
• "Steven Schveighoffer" <schveiguy yahoo.com> Feb 28 2008

quest <quest questx.com> writes:

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 ????.

Christopher Wright <dhasenan gmail.com> writes:

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.

quest <quest <quest questx.com>> writes:

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.

Robert Fraser <fraserofthenight gmail.com> writes:

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();
}

Bill Baxter <dnewsgroup billbaxter.com> writes:

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

Christopher Wright <dhasenan gmail.com> writes:

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.

"Steven Schveighoffer" <schveiguy yahoo.com> writes:

"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