Hi Everyone,
	Sorry if this is an obvious question; I'm just starting D
programming.
I was wondering, how do I initialize a class without using the new
keyword? I
am doing systems programming, so there is no malloc available, and I
want the
class to occupy a fixed size of the parent class.

Kernel k = new
Kernel(*mb_magic, mb_info);// Compiles, but doesn't link
// (_d_newclass not included)
Kernel k(*mb_magic, mb_info);// Compile error
Kernel k = Kernel(*mb_magic, mb_info);// Compile error
Kernel k; //Compiles,
but I don't see how it calls my constructor
          // with two arguments...
Basically, I don't want the garbage collector, or any dynamic memory
allocation, I just want the class to be a fixed part in the binary.

I want
something equivalent to the C++ statement:
Kernel k(*mb_magic, mb_info);
Thanks!

-- 
Braden MacDonald

Braden MacDonald wrote:
> Hi Everyone, 	Sorry if this is an obvious question; I'm just starting D
> programming. I was wondering, how do I initialize a class without using the new
> keyword? I am doing systems programming, so there is no malloc available, and I
> want the class to occupy a fixed size of the parent class. 

Firstly, you have to use the 'new' operator.  D class variables are references to an arbitrary object, not the object itself.  So your

Kernal k;

creates a variable which can hold a referance to any Kernal object.  You can write a custom allocator, and can disable the GC and/or preallocate memory to get realtime performance.  Not my area, really, but I know some people have been playing with this before.

Check out http://www.digitalmars.com/d/memory.html#newdelete to see about custom allocation.

-C. Sauls
-Invironz

Braden MacDonald wrote:
> Hi Everyone, 	Sorry if this is an obvious question; I'm just starting D
> programming. I was wondering, how do I initialize a class without using the new
> keyword? I am doing systems programming, so there is no malloc available, and I
> want the class to occupy a fixed size of the parent class.  I want
> something equivalent to the C++ statement: Kernel k(*mb_magic, mb_info);
> Thanks! 

Can you use a struct instead of a class?  D structs aren't polymorphic, but they can live on the stack.

 -- andy

In article <c6e9pd$1j3l$1@digitaldaemon.com>, Andy Friesen says...
>Braden MacDonald wrote:
>> ...
>> I was wondering, how do I initialize a class without using the new
>> keyword? I am doing systems programming, so there is no malloc available, >>  ...
>> I want something equivalent to the C++ statement:
>> Kernel k(*mb_magic, mb_info);
>> Thanks!
>
>Can you use a struct instead of a class?  D structs aren't polymorphic, but they can live on the stack.
>
>  -- andy

Thanks for the tips; I tried this, and it works well. My converted code (from C++) now runs like a charm. Thanks for your help.

--
Braden