• tsalm <tsalm free.fr> Dec 09 2008
• Ellery Newcomer <ellery-newcomer utulsa.edu> Dec 09 2008
• "Denis Koroskin" <2korden gmail.com> Dec 09 2008
• BCS <ao pathlink.com> Dec 09 2008
• "Jarrett Billingsley" <jarrett.billingsley gmail.com> Dec 09 2008
• "Denis Koroskin" <2korden gmail.com> Dec 09 2008
• BCS <ao pathlink.com> Dec 10 2008
• "Denis Koroskin" <2korden gmail.com> Dec 10 2008
• tsalm <tsalm free.fr> Dec 09 2008

tsalm <tsalm free.fr> writes:

Hello,

How to implement an object that can do this :
myClass.add(something)(otherthings)(thisToo);

Is it possible ?

TIA,
TSalm

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

tsalm wrote:
 Hello,
 
 How to implement an object that can do this :
 myClass.add(something)(otherthings)(thisToo);
 
 Is it possible ?
 
 TIA,
 TSalm


Something like this might work:

class MyClass{
    int[] stuff;
    alias add opCall;
    MyClass add(int k){
       stuff ~= k;
       return this;
    }
}

"Denis Koroskin" <2korden gmail.com> writes:

On Wed, 10 Dec 2008 02:40:47 +0300, tsalm <tsalm free.fr> wrote:

 Hello,

 How to implement an object that can do this :
 myClass.add(something)(otherthings)(thisToo);

 Is it possible ?

 TIA,
 TSalm


Yes:

import std.stdio;

class MyClass
{
    class MyClassAdder
    {
        MyClassAdder opCall(Foo foo)
        {
            _add(foo);
            return this;
        }
    }
	
    class MyClassRemover
    {
        MyClassRemover opCall(Foo foo)
        {
            _remove(foo);
            return this;
        }
    }
	
    this()
    {
        _adder = new MyClassAdder();
        _remover = new MyClassRemover();
    }

    MyClassAdder add(Foo foo)
    {
        _add(foo);
        return _adder;
    }
	
    MyClassRemover remove(Foo foo)
    {
        _remove(foo);
        return _remover;
    }

    private void _add(Foo foo) { writefln("added"); }
    private void _remove(Foo foo) { writefln("removed"); }
    private MyClassAdder _adder;
    private MyClassRemover _remover;
}

class Foo
{
}

void main()
{
    MyClass myClass = new MyClass();
    myClass.add(null)(null)(null);
    myClass.remove(null)(null)(null);
}

BCS <ao pathlink.com> writes:

Reply to TSalm,

 Hello,
 
 How to implement an object that can do this :
 myClass.add(something)(otherthings)(thisToo);
 Is it possible ?
 
 TIA,
 TSalm


if you don't mind dropping the )(


class C
{
    final void add(T...)(T t)
    {
        foreach(int i,_;T)
            _add(t[i]);
    }
    //.....
}


(new C).add(something, otherthings, thisToo);

"Jarrett Billingsley" <jarrett.billingsley gmail.com> writes:

On Tue, Dec 9, 2008 at 7:00 PM, BCS <ao pathlink.com> wrote:
 class C
 {
   final void add(T...)(T t)
   {
       foreach(int i,_;T)
           _add(t[i]);
   }
   //.....
 }


 (new C).add(something, otherthings, thisToo);


If all the params are the same type, typesafe variadics are a more
efficient/less code-bloaty way to do it.

void add(int[] things...)
{
    foreach(thing; things)
        _add(thing);
}

"Denis Koroskin" <2korden gmail.com> writes:

On Wed, 10 Dec 2008 03:24:48 +0300, Jarrett Billingsley
<jarrett.billingsley gmail.com> wrote:

 On Tue, Dec 9, 2008 at 7:00 PM, BCS <ao pathlink.com> wrote:
 class C
 {
   final void add(T...)(T t)
   {
       foreach(int i,_;T)
           _add(t[i]);
   }
   //.....
 }


 (new C).add(something, otherthings, thisToo);


 If all the params are the same type, typesafe variadics are a more
 efficient/less code-bloaty way to do it.

 void add(int[] things...)
 {
     foreach(thing; things)
         _add(thing);
 }


*And* allows overriding them!

BCS <ao pathlink.com> writes:

Reply to Denis,

 On Wed, 10 Dec 2008 03:24:48 +0300, Jarrett Billingsley
 <jarrett.billingsley gmail.com> wrote:
 
 On Tue, Dec 9, 2008 at 7:00 PM, BCS <ao pathlink.com> wrote:
 
 final void add(T...)(T t)
 


 efficient/less code-bloaty way to do it.
 


 


Note the functionality that both solution provide is trivial. All the real 
work gets done in the _add functions that /can/ be overridden.

"Denis Koroskin" <2korden gmail.com> writes:

On Wed, 10 Dec 2008 19:31:47 +0300, BCS <ao pathlink.com> wrote:

 Reply to Denis,

 On Wed, 10 Dec 2008 03:24:48 +0300, Jarrett Billingsley
 <jarrett.billingsley gmail.com> wrote:

 On Tue, Dec 9, 2008 at 7:00 PM, BCS <ao pathlink.com> wrote:

 final void add(T...)(T t)


 efficient/less code-bloaty way to do it.




 Note the functionality that both solution provide is trivial. All the  
 real work gets done in the _add functions that /can/ be overridden.


In this case it can be made final (or avoided at all) to improve runtime  
performance.

tsalm <tsalm free.fr> writes:

Le Wed, 10 Dec 2008 03:16:49 +0100, Denis Koroskin <2korden gmail.com> a  
écrit:

 On Wed, 10 Dec 2008 03:24:48 +0300, Jarrett Billingsley  
 <jarrett.billingsley gmail.com> wrote:

 On Tue, Dec 9, 2008 at 7:00 PM, BCS <ao pathlink.com> wrote:
 class C
 {
   final void add(T...)(T t)
   {
       foreach(int i,_;T)
           _add(t[i]);
   }
   //.....
 }


 (new C).add(something, otherthings, thisToo);


 If all the params are the same type, typesafe variadics are a more
 efficient/less code-bloaty way to do it.

 void add(int[] things...)
 {
     foreach(thing; things)
         _add(thing);
 }


 *And* allows overriding them!



Thanks you all !