Newbie question

[Stewart Gordon]

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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