Hi,
trying to get D into my brain but somehow I'm not in sync yet...

This works (from the docs):

struct Foo {
  public:
  int data() { return m_data; }                  // read property
  int data(int value) { return m_data = value; } // write property

  private:
  int m_data;
}

void main() {
  Foo f;
  f.data = 3; // same as f.data(3);
  printf ("%d", f.data + 3); // same as return f.data() + 3;
}

This doesn't:

class Foo {
  public:
  int data() { return m_data; }                  // read property
  int data(int value) { return m_data = value; } // write property

  private:
  int m_data;
}

void main() {
  Foo f;
  f.data = 3; // same as f.data(3);
  printf ("%d", f.data + 3); // same as return f.data() + 3;
}

Thanks for any help

Dune

BTW: Maybe I will bother you guys/gals even more... depending on my grasping skills ;)

Dune wrote:
<snip>
> This doesn't:
> 
> class Foo {
>   public:
>   int data() { return m_data; }                  // read property
>   int data(int value) { return m_data = value; } // write property
> 
>   private:
>   int m_data;
> }
> 
> void main() {
>   Foo f;
>   f.data = 3; // same as f.data(3);
<snip>

Welcome to D.

Classes in D have reference semantics.  That is, by declaring a Foo, you are declaring not an object, but a reference to one.  Initially, any reference is null, i.e. it doesn't refer to anything.  Before you can do anything with it, you must make it refer to an object.

    f = new Foo;

This creates a new object of type Foo, and makes f refer to it.  Once that's done, then you can do stuff with it.

Stewart.

-- 
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My e-mail is valid but not my primary mailbox.  Please keep replies on the 'group where everyone may benefit.

Duh!

While reading your post it was obvious that I forgot the essential stuff. Thanks.

Dune

Hi Dune,


    You needed the following line change "Foo f = new Foo;" since
a class is an object, you needed to create it first before you
using it.

class Foo {
  public:
  int data() { return m_data; }                  // read property
  int data(int value) { return m_data = value; } // write property

  private:
  int m_data;
}

void main() {
  Foo f = new Foo;
  f.data = 3; // same as f.data(3);
  printf ("%d", f.data + 3); // same as return f.data() + 3;
}

David L