Hello everybody,

what is D's equivalent to C++'s "this" keyword? How can I refer to the object instance itself?

Nils

Umm... this?  How does the D "this" differ from the C++ "this"?

-[Unknown]


> Hello everybody,
> 
> what is D's equivalent to C++'s "this" keyword? How can I refer to the object instance itself?
> 
> Nils

According to http://www.digitalmars.com/d/lex.html#keyword :) D has also 'this' keyword.

this.param = 123;

Andrew.

On Sun, 24 Apr 2005 00:24:30 +0200, Nils Hensel wrote:

> Hello everybody,
> 
> what is D's equivalent to C++'s "this" keyword? How can I refer to the object instance itself?
> 
The answer is 'this'.

Example code:
//----------------
import std.stdio;

class Foo
{
    char[] v;

    this()
    {
        v = "abc".dup;
    }

    void disp(char[] v)
    {
        writefln("%s", this.v ~ v);
    }
}

void main()
{
    Foo f = new Foo;

    f.disp("def");
}
//------------


-- 
Derek Parnell
Melbourne, Australia
24/04/2005 9:05:35 AM

Derek Parnell schrieb:
> The answer is 'this'. 

Thanks to all for your answers. Actually I tried this but always got a compiler error which I thought was connected to "this". What actually got me was:

<D Documentation>

If there is no constructor for a class, but there is a constructor for the base class, a default constructor of the form:

	this() { }
	
is implicitly generated.

</D Documentation>

Somehow I was thinking that the constructor would be inherited. I'm too tired for programming right now I believe. Too many stupid ideas. Better get some sleep. ;-)


Thanks anyway,

Nils

"Nils Hensel" <nils.hensel@web.de> wrote in message news:d4emra$2ksa$1@digitaldaemon.com...
> Derek Parnell schrieb:
> > The answer is 'this'.
>
> Thanks to all for your answers. Actually I tried this but always got a compiler error which I thought was connected to "this". What actually got me was:
>
> <D Documentation>
>
> If there is no constructor for a class, but there is a constructor for the base class, a default constructor of the form:
>
> this() { }
>
> is implicitly generated.
>
> </D Documentation>
>
> Somehow I was thinking that the constructor would be inherited. I'm too tired for programming right now I believe. Too many stupid ideas. Better get some sleep. ;-)
>
>
> Thanks anyway,
>
> Nils

It is inhereted, but under the name "super" rather than "this" so that you have access to both.

TZ