• "Larry Luther" <larry.luther dolby.com> Apr 29 2010
• Ellery Newcomer <ellery-newcomer utulsa.edu> Apr 29 2010
• bearophile <bearophileHUGS lycos.com> Apr 30 2010
• "Larry Luther" <larry.luther dolby.com> Apr 30 2010

"Larry Luther" <larry.luther dolby.com> writes:

Why do I get an "object.Error: Access Violation" in the following code?
If I change "class" to "struct" and remove "public:" I don't get an error.
I'm using D2.

import std.stdio;

class Plane {
  public:
    int
      xres,
      yres;
};


void main (string[] args) {
 Plane
  p;
  p.xres = 1920;
}

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

On 04/29/2010 08:50 PM, Larry Luther wrote:
 Why do I get an "object.Error: Access Violation" in the following code?
 If I change "class" to "struct" and remove "public:" I don't get an error.
 I'm using D2.

 import std.stdio;

 class Plane {
    public:
      int
        xres,
        yres;
 };


 void main (string[] args) {
   Plane
    p;
    p.xres = 1920;
 }


because 'Plane p;' is short for 'Plane p = null;'

I bet you want 'Plane p = new Plane();'

or if you want it allocated on the stack, I think

'scope Plane p = new Plane();'

should work.

bearophile <bearophileHUGS lycos.com> writes:

Larry Luther:

 Why do I get an "object.Error: Access Violation" in the following code?
 If I change "class" to "struct" and remove "public:" I don't get an error.
 I'm using D2.


D classes are not like C++ classes, they are managed by reference only, as in
Java. See the scope keyword too.

Bye,
bearophile

"Larry Luther" <larry.luther dolby.com> writes:

Thanks for your help.