• Steven Schveighoffer <schveiguy yahoo.com> Sep 04 2010
• Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> Sep 04 2010

Steven Schveighoffer <schveiguy yahoo.com> writes:

Andrei Alexandrescu Wrote:

 On 9/3/10 16:03 CDT, bearophile wrote:
 JMRyan:
 Is this a bug in the compiler (v.2.047)?  Am I missing something in
 thinking it shouldn't be?


 I think it's not a bug. It's not a common need, but a method may way want to
swap this with another. In Phobos this is done on a struct, see:
 http://www.dsource.org/projects/phobos/browser/trunk/phobos/std/stdio.d#L324

 Bye,
 bearophile


 For classes this must be an rvalue.
 
 Andrei


Should this work?

class C
{
  int x;
  void opAssign(int n) {x = n;}
  void foo(int n) {this = n;}
}

I agree this should not be rebindable.  But it has to be an lvalue.

-Steve

Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:

On 09/04/2010 10:41 AM, Steven Schveighoffer wrote:
 Andrei Alexandrescu Wrote:

 On 9/3/10 16:03 CDT, bearophile wrote:
 JMRyan:
 Is this a bug in the compiler (v.2.047)?  Am I missing something in
 thinking it shouldn't be?


 I think it's not a bug. It's not a common need, but a method may way want to
swap this with another. In Phobos this is done on a struct, see:
 http://www.dsource.org/projects/phobos/browser/trunk/phobos/std/stdio.d#L324

 Bye,
 bearophile


 For classes this must be an rvalue.

 Andrei


 Should this work?

 class C
 {
    int x;
    void opAssign(int n) {x = n;}
    void foo(int n) {this = n;}
 }

 I agree this should not be rebindable.  But it has to be an lvalue.

 -Steve


The example should work, but doesn't need this to be an lvalue.

Andrei